Professor Jeffrey Walker

Professor Jeffrey Walker

Head of Department, Professor in Water Engineering
Department of Civil Engineering
Room 115, 23 College Walk (B60), Clayton Campus

Jeffrey Walker is a Professor and Head of the Department of Civil Engineering at Monash University. He is undertaking research on soil moisture remote sensing and data assimilation, including development of the only Australian airborne capability for simulating new satellite missions for soil moisture. He is contributing to soil moisture satellite missions at both NASA and ESA, as a Science Definition Team member for the Soil Moisture Active Passive (SMAP) mission and Cal/val Team member for the Soil Moisture and Ocean Salinity (SMOS) mission respectively.

Professor Jeffrey Walker received his BEng(Civil) and BSurv degrees in 1996 with Hons 1 and University Medal from the University of Newcastle, Australia, and received his PhD in Water Resources Engineering from the same University in 2000. His PhD thesis was among the early pioneering research on estimation of root-zone soil moisture from remotely sensed surface soil moisture observations. He then joined NASA Goddard Space Flight Centre to implement his soil moisture work globally. In 2001 he moved to the Department of Civil and Environmental Engineering at the University of Melbourne as Lecturer, where he continued his soil moisture work, including development of the only Australian airborne capability for simulating new satellite missions for soil moisture. In 2010 he was appointed as Professor in the Department of Civil Engineering at Monash University where he is continuing this research.

His primary research ambition is to lead programs in socially relevant research that will have a positive impact on the way we take care of the environment so as to result in an improved quality of life both now and in the generations to come. He believes that the key to this is through improved earth system state and flux monitoring, prediction and reporting, in a way that is relevant to policy and decision making processes, flood and drought prediction and assessment, land and water management, national weather and climate forecasting, etc. His vision is that this goal will be realised through a combination of i) environmental sensing, ii) earth system modelling, and iii) optimal convergence of model predictions with observations through data assimilation. This is a new area of research that has gained wide spread interest over the past years.

 

Qualifications

  • Doctor of Philosophy in Water Resources Engineering, The University of Newcastle, 2000
  • Bachelor of Engineering in Civil Engineering (Honours I, University Medal), The University of Newcastle, 1996
  • Bachelor of Surveying (Honours I, University Medal), The University of Newcastle, 1996

Expertise

Water Resources

A combination of i) environmental sensing, ii) earth system modelling, and iii) optimal convergence of model predictions with observations through data assimilation.

Research Experience and Employment History:

2017-2018 Interim Dean, Faculty of Engineering, Monash University, Australia.
2012-present Professor and Head, Department of Civil Engineering, Monash University, Australia.
2010-2011 Professor, Department of Civil Engineering, Monash University, Australia.
2007-2010 Associate Professor and Reader, Department of Civil and Environmental Engineering, The University of Melbourne, Australia.
2003-2006 Senior Lecturer, Department of Civil and Environmental Engineering, The University of Melbourne, Australia.
2001-2003 Lecturer, Department of Civil and Environmental Engineering, The University of Melbourne, Australia.
1999-2001 Research Scientist, Hydrological Sciences Branch, NASA/GSFC, Greenbelt, Maryland, USA. Firstly with the USRA Goddard Visiting Scientists Program and then with the UMBC Goddard Earth Sciences and Technology Center.
1996-1999 Doctoral Scholar, Department of Civil, Surveying and Environmental Engineering, The University of Newcastle, Australia.
1995 Honours Scholar, Department of Civil, Surveying and Environmental Engineering, The University of Newcastle, Australia.

Awards and Honours:

2019

  • Fellow of the Institute of Electrical and Electronics Engineers for Contributions to airborne and satellite remote sensing of soil moisture.

2017

  • NASA Group Achievement Award to the SMAP Science Team for Outstanding contributions to the development of NASA SMAP mission and demonstration of its scientific and societal impact.

2016

  • NASA Group Achievement Award to the SMAP Science and Cal/Val Team for Contributions to the preparation of science algorithm and calibration/validation activities for the Soil Moisture Active Passive Mission.

2014

  • SSSI Educational Development Award.

2011

  • Monash Postgraduate Association Supervisor of the Year.

2009

  • Inaugural Anton Hales Medal in Earth Sciences.

2006

  • Best Paper, Hydrology and Water Resources Symposium.

2004

  • British Council Eureka Prize for Inspiring Science, Finalist.

2000

  • Lorenz G. Straub Award for Most Meritorious PhD Thesis Submitted World Wide in Hydraulics and Hydrology, Runner up.

1995

  • University Medal in Civil Engineering.
  • University Medal in Surveying.
  • Deans Medal.
  • The Board of Surveyors’ Medal.
  • The ACSE Prize in Structural Engineering.
  • The Consulting Surveyors New South Wales Prize in Land Studies.
  • The Hunter Water Corporation Achievement Award.
  • The Institution of Engineers Australia Civil and Structural Branch Prize in Civil Engineering.
  • The Institution of Surveyors Australia Hunter-Manning Group Prize in Surveying.
  • The James Hardie Pipelines Water Resources Engineering Prize.
  • The Peter Kleeman Medallion.
  • The Spruson & Ferguson Prize in Civil Engineering.
  • Mine Subsidence Technological Society Prize in Geotechnical Design.
  • The Tony Herzog Award.
  • The Metal Building Manufacturers’ Association Prize.

1994

  • The SRIA University Award for Concrete Design.

1993

  • The Astley Pulver Prize for Second Year Surveyors.

1992

  • The BHP Rod & Bar Products Division Prize in Civil Engineering.

Professional Affiliations:

Institute of Electrical and Electronic Engineers, Fellow.
Institute Engineers Australia, Fellow, CPEng, EngExec.
American Geophysical Union, Member.

Research Interests

My primary research ambition is to lead programs in socially relevant research that will have a positive impact on the way we take care of the environment so as to result in an improved quality of life both now and in the generations to come. I believe that the key to this is through improved earth system state and flux monitoring, prediction and reporting, in a way that is relevant to policy and decision making processes, flood and drought prediction and assessment, land and water management, national weather and climate forecasting, etc. My vision is that this goal will be realised through a combination of i) environmental sensing, ii) earth system modelling, and iii) optimal convergence of model predictions with observations through data assimilation. This is a new area of research that has gained wide spread interest over the past years.

Research Projects

Current projects

High Resolution Airborne P-band Radar for Environmental Research

This project aims to establish a new national capability for airborne-radar remote-sensing to provide unprecedented detail on environmental variables including soil moisture, salinity, vegetation and terrain height. This instrument, together with existing radar and radiometer capability, will yield the first airborne satellite simulator of its type in the world, providing Australian and overseas researchers with a unique and affordable tool for world-class pioneering research. This novel combination of sensors is expected to yield a level of detail that cannot be achieved with any one sensor alone. Applications include increased capability for monitoring of important environmental data, such as information on soil moisture status required for efficient and sustainable water use.

Rapid Mapping Technologies for Precision Agriculture

Agricultural productivity is heavily constrained by soil nutrition, and, in turn fertiliser application strongly impacts crop yield and the cost of crop production. New sensing technologies and communication protocols are at the cusp of providing state-of-art infrastructure to farmers that will allow them to precisely monitor their soils in high resolution in space and time to optimize their fertiliser application and agricultural productivity. This project aims to develop the basis to rapidly map fertiliser requirements at high resolution across individual farms using a combination of ground-based and autonomous unmanned aerial vehicle (UAV)-based remote-sensing systems.

ARC Research Hub for Smart Next Generation Transport Pavements

This project aims to make road, airport and dockyard pavements smart, low cost, long-lasting, safe, green and adaptable to future transport demands. Australia’s $250b road network, upon which the nation depends for its economic and social prosperity, is at risk  due to i) increases in passenger and freight load degradation of the road network, and ii) material and expertise scarcity. These leave a vital national asset  unprepared for future demands. The hub will deliver the innovative materials and modelling, smart construction, and rehabilitation systems required for future demands, while enhancing road safety and reducing environmental impact – saving billions of dollars in the short, medium and long term.

Smart Irrigation: Proximal Soil Moisture Sensing for Real-Time Water Delivery Control

New sensing technologies are at the cusp of providing a state-of-art infrastructure to farmers that will allow them to precisely monitor their crop water requirements spatially, so as to optimize their irrigation scheduling and agricultural productivity. Thus, this project aims to develop a smart irrigation system using an L-band radiometer, allowing for precision water delivery using detailed soil moisture information, thus leading to more efficient water use.

Unmanned Aerial Vehicle Sensing and Data Discovery for a Changing Planet

This project aims to establish an earth systems monitoring facility, using unmanned aerial vehicles and world-leading sensor technology. It will have the capability to measure the natural and built environment at millimetre to centimetre scales and to monitor rapid changes. The ensuing data and interpretations will be useful for decision-making and policy development amongst government agencies and the agricultural, environmental, civil infrastructure and mining industries.

Towards P-band Soil Moisture Sensing from Space

This project will develop radiative transfer models to demonstrate that the top ~15cm layer of soil moisture can be remotely sensed using a new state-of-the-art P-band radiometer capability, through a series of tower and airborne field experiments. Timely soil moisture information on this near-surface layer is critical to improved water management for food production in the face of extreme climate variability. The challenge is to do this accurately over large areas with an appropriate spatio-temporal detail, and for a soil depth that closely approximates the layer which both impacts crop/pasture growth and influences management practices. Current satellite technologies are limited to the top ~5cm layer of soil using an L-band radiometer.

Improved Rainfall Measurement Using Mobile Phone Tower Link Attenuation

Accurate near-real-time precipitation data at high resolution are critical to flash flood forecasting in and around Australia’s capital cities. Current precipitation estimates suffer from the limited availability of rain gauge data in urban areas. However, mobile phone towers abound and the microwave links between them can provide information on rainfall intensity, meaning that these data may be used to supplement the shortfall in raingauge data. This project will develop the technology to generate precipitation maps using the combination of mobile phone network link, rain gauge and weather radar data. Melbourne will be the case study, validated using a research microwave scintillometer and super high resolution mobile weather radar.

Preserving Vegetation Health and Biodiversity of Natural, Urban Reserves

The aim of this project is to quantify the links between water resources, vegetation health and biodiversity in small native and remnant vegetation reserves embedded in urban environments. The specific objectives are to i) quantify water requirements and carbon balances in four reserves within Greater Melbourne hosting native tree species (River Red Gum), identified as vulnerable or endangered, and experiencing different rainfall regimes as well as water management practices, ii) test a set of measurement methods (in-situ and remote sensing) to relate water use with tree growth and biodiversity in urban reserves, and iii) develop a model for the water balance and vegetation growth to assist in the management of urban reserves and parks.

A Multi-frequency Microwave Radiometer System for Environmental Research

A multi-frequency microwave radiometer system for environmental research: A new capability for airborne remote sensing of key environmental variables will be established. The unique P-, Ku- and Ka-band passive microwave radiometer system will provide information on soil moisture, surface temperature and vegetation, and allow for a new satellite concept to be demonstrated. By combining with an existing L-band radiometer, data can be collected simultaneously at P-, L-, Ku- and Ka-bands, with increased spatial resolutions accordingly. The shorter wavelength, but higher spatial resolution data can be used to enhance the spatial resolution of the longer wavelength data, resulting in a capability to derive long wavelength observations from space at unprecedented spatial resolution.

On-the-go Soil Moisture Monitoring from GPS Signals During Routine Farming Operations

Mapping near surface soil moisture variation across agricultural fields is currently a challenging problem, especially as part of routine farming operations. Even earth observation satellites are a challenging option, due to the low spatial resolution of the most suitable satellites (several kilometres). Moreover, widely used field-based sensors only provide soil moisture measurements at single points, with many sensors required to provide a complete map. To overcome these issues, a proximal sensing technique for soil moisture mapping is proposed, which uses the ground reflected signals from Global Navigation Satellite Systems (such as the Global Positioning System) collected from tractors and other such farm equipment as they work the paddocks.

Linking Flow, Nutrients, Seagrass and Fish: An Integrated Approach to Estuary Management

Estuaries are iconic recreational areas providing both ecological habitat and millions of dollars in revenue to the tourism and fisheries industries. How estuaries respond to human pressures is highly variable with some such as the Gippsland Lakes succumbing to algal blooms, whilst other heavily nutrient laden systems such as the Werribee Estuary support extremely high fish populations. This project aims to lead to an understanding of the links between freshwater flow, blue-green algal blooms, and recruitment of a key fishery species, black bream. The outcome of the project aims to give catchment managers greater confidence in setting levels of environmental flows that will both support fish populations but also mitigate against algal blooms.

Catchment Water Balance and CO2 Fluxes: A Comparison Between Productive Land Uses

The aim of the project is to improve the understanding of different land use implications on water resource and land productivity. The project aims to use a paired-catchment study that compares the carbon and water balances in two catchments in the high rainfall zone in south western Victoria. One catchment is used prevalently for grazing, while the other is predominantly planted with blue gums. The main objectives of this project are: to quantify the effect of different agricultural land uses on the catchment water balance; to estimate the trade-off between carbon sequestration and water resources related to tree plantations and pastures; and to develop models at different spatial scales of catchment water balance for land-use management.

Validation of Global Water and Energy Balance Monitoring in the Australian Murray-Darling Basin Using GCOM-W1 Data

Together with the Japan Aerospace Exploration Agency (JAXA), this project will undertake validation of the Global Change Observation Mission for Water (GCOM-W) Advanced Microwave Scanning Radiometer-2 (AMSR-2) soil moisture observations in the Murray Darling Basin of Australia, and their subsequent use in land surface data assimilation systems. In order to validate both the AMSR-2 surface soil moisture product, and the derived root-zone soil moisture and land surface flux exchange through assimilation into land surface models, long-term ground observation of flux data will be collected within the SMAP Test-bed focus site, which is appropriately sized for the AMSR-2 footprint.

Improving Flood Forecasting Skill Using Remote Sensing Data

The hypothesis of this project is that remote sensing can be a very helpful tool for operational water management, with a particular focus on flood forecasting. For this purpose, remote sensing data will be used in two different ways. First, estimated soil moisture profiles from hydrologic models will be improved through the merging of these model predictions with remotely sensed surface soil moisture values. This is expected to have a beneficial impact on modelled hydrographs. Second, estimated flood inundations and water levels from hydraulic models will be improved through merging these model results with remotely sensed observations of flood inundations or water levels. This is expected to improve the predictive capability of the hydraulic model. Overall, using remote sensing data in flood forecasting is expected to lead to better early warning systems, management of floods, and post-processing of flood damages. The objective of the project is to demonstrate the utility of coupled hydrologic/hydraulic model forecasting and data assimilation using remotely sensed data for potential operational use. This is expected to have a strong future beneficial impact on flood management practices in Australia.

MoistureMonitor: A Multi-mission Soil Moisture Monitoring System for a Water Limited Future

A long-term soil moisture record for Australia is critical to understanding climate change feedback mechanisms and their impacts on water management. This project will validate, downscale and harmonise soil moisture retrievals from three satellite missions across this decade, each using a new and different low resolution antenna technology and interpretation approach. MoistureMonitor, the framework to deliver this soil moisture record, will be verified using airborne campaigns and hydrological monitoring infrastructure in the Murrumbidgee catchment. Important outcomes will be validation of a new soil moisture satellite and development of a high resolution soil moisture product for improved land and water management and policy for Australia.

Mobile Weather Radar System for Advanced Environmental Monitoring and Modelling

The proposed infrastructure seeks to establish a new national capability for high spatial and temporal resolution weather radar data acquisition with application to a range of environmental fields. The METEOR 50DX is an X-Band weather radar system featuring Doppler and dual polarization technology to provide Australian rainfall and wind information with unprecedented accuracy and detail. Its compact trailer mounted design makes it suitable for applications across Australia, thus complementing our sparse national weather radar network, which is limited by the quality and coverage of many of its current radars. This new capability will allow Australian researchers to undertake world-class research on environmental prediction hitherto impossible.

SMOS + Hydrology

The integration of low resolution SMOS observations into finer resolution hydrologic models poses significant challenges. Therefore, this study aims at developing a robust end-to-end methodology that allows for the assimilation of SMOS data (either brightness temperature or soil moisture) into land surface models and for assessing the usefulness of SMOS data with respect to flood forecasting. The assimilation system is being set up for the Variable Infiltration Capacity (VIC) land surface model coupled to a river routing scheme, and tested for two large river basins, the Upper Mississippi Basin in central USA and the Murray Darling Basin in Eastern Australia. The aim of the study is to demonstrate the potential and limits of the SMOS level 1 and level 2 products and their benefits for flood prediction.

Past projects

Towards Global Water and Energy Balance Monitoring Using GCOM-W1 in the Australian Murray-Darling Basin

Together with the Japan Aerospace Exploration Agency (JAXA), this project will undertake validation of the Global Change Observation Mission for Water (GCOM-W) Advanced Microwave Scanning Radiometer-2 (AMSR-2) soil moisture observations in the Murray Darling Basin of Australia, and their subsequent use in land surface data assimilation systems. In order to validate both the AMSR-2 surface soil moisture product, and the derived root-zone soil moisture and land surface flux exchange through assimilation into land surface models, long-term ground observation of flux data will be collected within the SMAP Test-bed focus site, which is appropriately sized for the AMSR-2 footprint.

A New Generation Flood Forecasting System Using Observations From Space

Working with the Bureau of Meteorology, US Department of Agriculture Hydrology and Remote Sensing Laboratory and CSIRO, this project will develop a novel approach to combine observational data and computer models using data assimilation techniques to substantially improve the Bureau of Meteorology’s flood forecasting system. Current flood forecasts have a number of error sources that reduce their accuracy. We will integrate satellite observations of soil moisture and rainfall into the Bureau’s flood forecasting model to improve the accuracy of forecasts by reducing errors in rainfall inputs and modelled catchment wetness. The success of this study will result in a more accurate flood warning system for Australia.

Towards Operational Monitoring of Key Climate Parameters from Synthetic Aperture Radar

Economic, social, and environmental planning for a carbon-constrained future requires a capacity to monitor climate change impacts on vegetation and soil moisture at a level of detail that does not currently exist. While radar measurements from satellites can provide this important information, the signals are confounded by complex interactions with the Earth surface. Specifically, terrain micro-topography, vegetation structure/biomass, and the underlying soil moisture status, all interact together in an intricate way. Using airborne radar data together with detailed ground measurements, models of this complex interaction will be developed and tested for subsequent time-series application to satellite data across Australia.

Active Passive Microwave Soil Moisture Remote Sensing: Towards Sustainable Land and Water Management From Space

Soil moisture is a highly critical resource for the Australian agricultural economy which is stressed by climate change. Daily monitoring of paddock scale soil moisture from space represents a powerful tool to inform land management, allowing accurate crop yield and pasture growth predictions. At the continental scale, soil moisture information will result in better weather, climate and extreme flood prediction skill and the ability to assess the effects of future climate change on Australia. It is therefore imperative that active passive soil moisture retrieval algorithms be developed specifically for the Australian environment in order to take full advantage of the SMAP remote sensing mission when it is launched in 2012.

A New Paradigm for Improved Water Resource Management Using Innovative Water Modelling Techniques

The threat of climate change and Australia’s arid environment makes accurate water resource planning essential for sustainable water management. This is particularly relevant in rural Australian catchments with competing needs for scarce water resources, including irrigation to sustain farming communities, maintaining adequate flows for river health, and seasonal flooding for fragile eco systems. Accurately predicting key water balance components across catchments is crucial for improved water resource planning. Continuously constraining model predictions with time series of spatial data can identify weaknesses in model physics for correction and make model scenario testing more reliable so better water management decisions can be made.

MoistureMap: A Soil Moisture Monitoring, Prediction and Reporting System for Sustainable Land and Water Management

Knowledge of the spatial and temporal variation of surface and root zone soil moisture content is critical to environmental sustainability and risk adverse farm management. A paddock scale soil moisture prediction tool will allow i) grain growers to make informed decisions of what to plant and when, based on likely germination rates and crop yield, ii) graziers to be proactive regarding management of stocking rates based on likely pasture growth, and iii) better weather and climate prediction skill. At regional scales moisture information can be used to support claims of drought exceptional circumstances.

Quantifying Near-surface Diffuse Discharge from the Southwest Great Artesian Basin

The Great Artesian Basin (GAB) is the largest groundwater resource in Australia and supports a number of mining and pastoral operations. Sustainable use of this resource requires an improved understanding of its water balance, particularly the large component of vertical leakage. This project proposes to use isotopic and geochemical techniques, in addition to physical monitoring of evaporation losses, to constrain the near-surface component of vertical leakage from the GAB in South Australia. Sampling will be optimally targeted and scaled up using detailed mapping of the near-surface leakage zones from remote sensing. This study will result in improved understanding and management of this critical resource.

Airborne Hyperspectral Scanning for Advanced Monitoring and Assessment of Vegetation and Water Properties

The proposed infrastructure will give Australian researchers the most advanced capabilities available world wide in airborne remote sensing of the environment. By combining hyper spectral scanning, with full wave form resolving Light Detection and Ranging (LIDAR), microwave scanning and sythetic aperture RADAR, flown simultaneously on the most cost efficient and technologically advanced research aircraft, it will be possible to assess and monitor a wide range of parameters not accessible to airborne methods before.

Towards Improved Soil Moisture Retrieval by LiDAR Measurement of Microwave Properties of Vegetation and Development of a Data Assimilation Framework

We aim to improve the accuracy of soil moisture retrieval from satellite-based passive microwave systems. First, data collected from the recent Australian National Airborne Field Experiments (NAFE) by the University of Melbourne will be used to evaluate and test the data assimilation framework developed at the University of Reading (for snow mass modelling) in the context of soil moisture retrieval. Second, techniques used at the University of Reading for deriving vegetation structural information from airborne scanning LiDAR will be developed for application to a wider range of vegetation types and larger spatial scales, and applied to the NAFE data sets to explore the effects of improved vegetation characteristics on the retrieval of soil moisture from passive microwave observations.

High Resolution Airborne Radar for Environmental Research: Soil Moisture, Vegetation, Salinity and Terrain Mapping

There is a rapidly increasing demand for a range of environmental data. For example, information on soil moisture status is required for efficient and sustainable water use. Moreover, irrigation practices and large scale clearing have led to serious land degradation through increased salinity from rising water tables. Combined soil moisture and salinity measurement will provide important insight to this complex issue. Further, understanding the complex and rich biodiversity of Australian flora and its adaptation to droughts and fire is essential to ensuring Australian ecosystem longevity. Knowledge of flora changes through time as a function of soil moisture content and salinity is key to gaining this understanding.

Potential Applications for Airborne Remote Sensed Data

This project investigates the potential for high-resolution airborne sensing technologies for monitoring human impacts on rivers at the basin-scale. The resolution and coverage provided by airborne data can potentially transform our understanding of landscape-scale impacts and underlying causal processes. Improved monitoring and understanding of these impacts will inform more effective environmental policy and management for rivers at regional, state and national levels.

The Murrumbidgee Monitoring Network

This project will make the Murrumbidgee Monitoring Network data available to the ACCESS modelling community.

Improving the Airborne Mapping of Soil Moisture

Deriving soil moisture from passive microwave observations requires knowledge of the near surface soil temperature. The aim of our project is to develop a model by which the near surface soil temperature can be estimated from airborne data. These estimates can then be used for the retrieval of soil moisture information.

Airborne Laser Scanning for Advanced Environmental Monitoring

This proposal seeks to enhance the national capability for airborne remote sensing of key environmental variables through the acquisition of an airborne laser scanner and inertial navigation system. Many environmental science studies, such as hydrology, soil moisture scaling and salinity, can be significantly enhanced by airborne laser scanning, through the creation of high precision, high resolution digital terrain models. Airborne laser scanning can also measure three dimensional vegetation canopy structure, a useful indicator of biomass, carbon storage and vegetation health. This infrastructure will provide Australian researchers with a unique arsenal of remote sensing tools for advanced yet affordable environmental research Studies.

Advanced Algorithms to Retrieve Remotely Sensed Soil Moisture and Enhance Hydrological Prediction

The spatial information on soil moisture provided by remotely sensed data has considerable potential to improve hydrological prediction. Despite this, it has had very little application in hydrological modelling. This is because remote sensed data is an indirect measure of soil moisture, confounded by several factors which introduce considerable uncertainties. These uncertainties have proved difficult to reliably characterise and this has limited application. This project will utilise unique datasets acquired in recent large scale field experiments to develop new algorithms to more accurately retrieve remotely sensed soil moisture and its associated uncertainty. These algorithms will be based on statistical Bayesian hierarchal spatio-temporal models which have yet to be applied to retrieving soil moisture from remotely sensed data. The potential of new algorithms to improve the predictive power of hydrological models will be assessed. This pilot project will develop prototype algorithms on a small scale to demonstrate proof-of-concept with the long-term goal of seeking external research funding to develop a large scale application.

Integrate NASA's Global Soil Moisture Remote Sensing and Modeling Data into USDA's Global Crop Production Decision Support System

This project aims at integrating NASA?s global soil moisture remote sensing and modeling data products into the U. S. Department of Agriculture?s Global Crop Production Decision Support System to improve their reliability and accuracy for forecasting crop yields. USDA?s crop yield forecasts affect decisions made by farmers, businesses, and governments by defining the fundamental conditions in commodity markets.

High Resolution Mapping of Surface and Root Zone Soil Moisture

Knowledge of the spatial and temporal variation of surface and root zone soil moisture content at high spatial resolution is critical to achieving more efficient water utilisation practices in agriculture. Australia ‘s main river basins are under mounting pressure to satisfy a wide range of competing economic, social and environmental needs for water, particularly in terms of environmental flows and efficient irrigation. A better understanding of the soil moisture distribution at sub-farm scales will allow farmers to better utilise both the moisture in their soil and their limited allocation for irrigation. This will help alleviate soil moisture related problems in some of the nation’s key catchments, such as the Murray Darling Basin.

Assimilation of Latent and Sensible Heat Flux Data into the CSIRO Biosphere Model

This project will investigate the use of latent and sensible heat flux data to improve the predictive performance of a land surface model. The significance of land surface models is their ability to provide continuous prediction of latent and sensible heat flux feedback to atmospheric models for weather and climate forecasting. Historically, soil moisture and/or air temperature and humidity data have been used to correct land surface model predictions, despite their often weak and indirect relationship to latent and sensible heat flux. This research aims to use direct information on latent and sensible heat flux to achieve optimal flux predictions from land surface models.

Gravity Changes, Soil Moisture and Data Assimilation

This project will assess the utility of space and ground-based gravity measurements for monitoring changes in the hydrological cycle at regional scales. At present there are no methods available for monitoring changes in terrestrial water storage over the globe, despite its importance for assessing the effects of large-scale changes in land use and climate change. The launch of NASA’s Gravity Recovery and Climate Experiment (GRACE) satellites earlier this year provides a 5-year window of opportunity to undertake ground-based research to test this innovative technique for monitoring terrestrial water storage from gravity measurements – something that has been shown to be possible theoretically, but has not been testable until now.

On the Use of Remote Sensing Data in Bio-geo-chemical Marine Models

This project will investigate the use of satellite and other sources of water quality data for evaluating coastal marine model structure and improving predictive performance. The capability to model highly complex bio-geo-chemical marine systems is becoming increasingly possible due to advances in computing power, remote sensing data availability and interpretation algorithms. However, the techniques for using this data to evaluate and/or correct model trajectories are immature. This project will enhance the current capacity for using satellite derived data sources in marine bio-geo-chemical models with the purpose of generating greater credibility and reliability of model predictions. It will combine the strengths of CSIRO marine modelling capability with the UofM?s expertise in data assimilation and spatial analysis.

A New Airborne Facility for Environmental, Hydrological, Atmospheric and Oceanic Research: High Resolution Measurement of Soil Moisture, Temperature and Salinity

This proposal seeks to establish a new national capability for airborne remote sensing of key environmental variables. It will enable high-resolution mapping of near-surface soil moisture, land surface salinity and temperature, and ocean surface salinity and temperature. It will be a new tool for hydrologic, atmospheric and oceanic researchers, providing unprecedented detail on characteristics critical to our understanding and management of the environment. The small instrument size and weight will enable use of a light aircraft as the observing platform, providing the national (and international) research community with an affordable tool, hitherto unavailable.

Scaling and Assimilation of Soil Moisture and Streamflow

Information on how soil moisture varies in space and time has been largely restricted to point-scale groundbased measurements. We will develop methods for predicting how soil moisture status evolves in time over a range of spatial scales, by assimilating groundbased measurements and satellite observations of soil moisture together with streamflow observations into simple rainfall-runoff models. Extensive soil moisture monitoring will allow development of scaling relationships and validation for new satellite-based microwave radiometers.

Use of Remote Sensing Actual Evapotranspiration Estimates and Water Delivery Data for Assessing Water Use Efficiency in an Irrigated Landscape

Improving management of water in irrigated agriculture will lead to increased sustainability, decreased environmental impacts and increased profitability. Quatifying water use efficiency for an irriguation district is a vital part of improving water management. This project aims to develop new methods for quatifying water use efficiency by combining actual evapotranspiration estimates with water delivery information at the farm scale for an entire irrigation district. Remote sensing techniques will be utilized to map actual evapotranspiration and water meter data will be combined with cadastral and channel network data to map water delivery.

Assimilation of Satellite Observations of the Land Surface in Support of NASA's Seasonal-to-Interannual Prediction Project

This project will address the importance of assimilation of satellite observations, with the focus on soil moisture retrievals, in the initialisation of the land surface to enhance seasonal-to-interannual climate forecasts. Key aspects of this research are i) the extension of the current one-dimensional approach to take into account three-dimensionsl structures in forecast error due to forcing error and large scale correlations in the model properties; and through the development of strategies to account for model biases, and ii) the implementation of an operational land assimilation system based on these combined activities.

A Catchment-Based Global River Routing Scheme for Climate Models and Assimilation of Streamflow and Altimetry Data

There are two broad goals of this research. The first is to develop and test a new, catchment-based, global river transport scheme for use in global climate models and coupled climate system models that overcomes the shortcommings of cell-based models. The second goal is to develop and test methodologies for assimilation of stream gauge and satellite altimetric measurements into the new scheme.

Global Validation of EOS-AQUA Land Surface Dynamics Using Data Assimilation

This project seeks to determine the nature and variability in selected global soil moisture and snow products measured by the AMSR-E sensor on a variety of time scales, and to analyise the effects of these uncertainties on the predictability of the global surface water and energy balance using land surface data assimilation techniques in near real-time.

Optimal Land Initialisation for Seasonal Climate Prediction

This project seeks to provide optimal initialisation of the NSIPP (NASA Seasonal to Interannual Prediction Project) land surface model, through assimilation of near-surface soil moisture observations into the land surface model.

Validation of the AMSR-E Satellite Soil Moisture Product

One of the products to be provided by the AMSR-E remote sensing instrument is 25km resolution near-surface (top 1cm) soil moisture content at a specified accuracy of better than 6%v/v for areas having vegetation cover of less than 1.5kg/m2. Due to a lack of historical data, the algorithms to derive this soil moisture product have not been widely tested. We propose to test the validity of these algorithms for soil moisture measurement under Australian conditions.

Optimal Land Initialisation for Seasonal Climate Prediction: Brightness Temperature Assimilation

Accurate initialisation of the land surface in global climate models is critical for seasonal-to-interannual climatological prediction, because of its regulation on fluxes from the land surface to the atmosphere. Previous work has demonstrated the ability to obtain soil moisture initial conditions throughout the top metre or so of the Earth?s surface by assimilation of satellite measurements of near-surface soil moisture. This project seeks to extend that work, by assimilating the satellite brightness temperature measurements (ie. measurements of the radiation received at the sensor), rather than a derived soil moisture product, allowing the assimilation to impact both the soil moisture and temperature states, and eliminating restrictive assumptions made in deriving the soil moisture independent of the assimilation.

Optimal Land Initialisation for Seasonal Climate Prediction: Soil Moisture Assimilation

Accurate initialisation of the land surface in global climate models is critical for seasonal-to-interannual climatological prediction, because of its regulation on fluxes from the land surface to the atmosphere. Due to its long term persistence, it is most important that land soil moisture content be optimaly initialised. This project seeks to provide optimal land surface initialisation for Australia, in collaboration with the NASA Seasonal-to-Interannual Prediction Project (NSIPP) and the efforts at NASA Goddard Space Flight Centre to provide such initial conditions globally, through the assimilation of satellite measurements of near-surface soil moisture.

Assimilation of Remotely Sensed Snow Observations into the NSIPP Land Surface Model

This project seeks to provide optimal initialisation of the NSIPP (NASA Seasonal to Interannual Prediction Project) land surface model, through assimilation of snow melt signature, snow water equivalent, snow depth and snow cover observations into the land surface model.

A Global Land Data Assimilation System (GLDAS)

This project seeks to develop a high resolution, near-real-time global land data assimilation system using relevant remotely sensed and in-situ observations within a land data assimilation framework. This project is an extension to the North American LDAS project.

Book Chapters

Dasgupta, A., Grimaldi, S., Ramsankaran, RAAJ, Pauwels, V., Walker, J., Chini, M., Hostache, R. and Matgen, P., In Review. Flood Mapping Using Synthetic Aperture Radar Sensors from Local to Global Scales. AGU Books.

Pipunic, R. C., Ryu, D. and Walker, J. P., 2015. Assessing Near-Surface Soil Moisture Assimilation Impacts On Modeled Root-Zone Moisture For An Australian Agricultural Landscape. In: V. Lakshmi, D. Alsdorf, M. Anderson, S. Biancamaria, M.H. Cosh, J. Entin, G.J. Huffman, W. Kustas, P. van Oevelen, T. H. Painter, J. Parajka, M. Rodell, and Rudiger C. (Eds.) Remote Sensing of the Terrestrial Water Cycle, Geophysical Monograph 206, Wiley, United States, ISBN 978-1-118-87203-1, 556pp. (pdf 387kB)

Houser, P., De Lannoy, G., and Walker, J. P., 2012. Hydrologic Data Assimilation. In: J. P. Tiefenbacher (Ed.), Approaches to Managing Disaster – Assessing Hazards, Emergencies and Disaster Impacts, InTech, ISBN 979-953-307-006-2, 162pp. (pdf 601kB)

Houser, P. R., De Lannoy, G. and Walker, J. P., 2010. Land Surface Data Assimilation, p549-598. In: Lahoz, W., Khatattov, B. and Menard, R. (Eds.), Data Assimilation: Making sense of observations, Springer, The Netherlands, 732pp. (pdf 1.2MB)

Grayson, R. B., Western, A. W., Walker, J. P., Kandel, D. D., Costelloe, J. F. and Wilson, D. J., 2006. Controls on Patterns of Soil Moisture in Arid and Semi-Arid Systems, In: P. D’Ordorico and A. Porporato (Eds.), Ecohydrology of Arid and Semi-Arid Ecosystems, Springer, The Netherlands, 341pp. (pdf 1.6MB)

Walker, J. P. and Houser, P. R., 2005. Hydrologic Data Assimilation, In: A. Aswathanarayana (Ed.), Advances in Water Science Methodologies, A.A. Balkema, The Netherlands, 230pp. (pdf 696kB)

Peer Reviewed Journal Papers

Ye, N., Walker, J. P., Bindlish, R., Chaubell, J., Das, N. N., Gevaert, A. I., and Rüdiger, C.,  Evaluation of SMAP Downscaled Brightness Temperature Using SMAPEx-4/5 Airborne Observations, Remote Sensing of Environment, In Press (Accepted 23 Nov)

Shokri, A., Walker, J. P., van Dijk, A. I. J. M., and Pauwels, V. R. N. Performance of Different Ensemble Kalman Filter Structures to Assimilate GRACE Terrestrial Water Storage Estimates into a High-Resolution Hydrological Model: A Synthetic Study, Water Resources Research, In Press (9 Oct)

Zhu, L., Walker, J. P., Ye, N., Rudiger, C., Hacker, J., Panciera, R., Tanase, M. A., Wu, X., Gray, D. A., Stacy, N., Goh, A., Yardley, H., and Mead, J., 2018. The Polarimetric L-band Imaging Synthetic Aperture Radar: Description, Calibration and Cross-validation. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 11(11): 4513-4525.

Rains, D., De Lannoy, G., Lievens, H., Walker, J. P. and Verhoest, N. E. C., SMOS and SMAP Brightness Temperature Assimilation over the Murrumbidgee Basin, IEEE Geoscience and Remote Sensing Letters, In Press (Accepted 9 July)

Wright, A., Walker, J. P. and Pauwels, V. R. N., A Multi-model Hydrological Analysis of Rainfall Estimates Using Ensemble Kalman Filter Innovations, Journal of Hydrometeorology, 19(8): 1305-1320.

Dasgupta, A., Grimaldi, S., Ramsankaran, R. A. A. J., Pauwels, V. R. N. and Walker, J. P., Towards Operational SAR-based Flood Mapping Using Neuro-fuzzy Texture-based Approaches, Remote Sensing of Environment, 215: 313-329.

He, L., Hong, Y., Wu, X., Ye, N., Walker, J. P. and Chen, X., 2018. Investigation of SMAP Active-Passive Downscaling Algorithms Using Combined Sentinel-1 SAR and SMAP Radiometer Data, IEEE Transactions on Geoscience and Remote Sensing, xx(x): xxxx-xxxx.  Copyright 2018 IEEE (pdf 7.5MB)

Shahrban, M., Walker, J. P., Wang, Q. J. and Robertson, D., On the Importance of Soil Moisture in Calibration of Rainfall-Runoff Models: Two Case Studies, Hydrological Sciences Journal, In Press (Accepted 19 April 2018)

Ye, N., Walker, J. P., Rüdiger, C., Ryu, D., and Gurney, R. J., 2018. Surface Rock Effects on Soil Moisture Retrieval from L-band Passive Microwave ObservationsRemote Sensing of Environment, 215: 33-43. Copyright 2018 Elsevier Science Ltd. (pdf 4.0 MB)

Das, N. N., Entekhabi, D., Dunbar, R. S., Colliander, A., Chen, F., Crow, W., Jackson, T. J., Berg, A., Bosch, D., Caldwell, T., Cosh, M. H., Collins, C. H., Lopez-Baeza, E., Moghaddam, M., Rowlands, T., Starks, P. J., Thibeault, M., Walker, J. P., Wu, X., O’Neill, P. E., Yueh, S. and Njoku, E. G., 2018. The SMAP Mission Combined Active-Passive Soil Moisture Product at 9 km and 3km Spatial ResolutionsRemote Sensing of Environment, 211: 204-217. Copyright 2018 Elsevier Science Ltd. (pdf 7.9 MB)

Shokri, A., Walker, J. P., van Dijk, A. I. J. M., Wright, A. J. and Pauwels, V. R. N., 2018. Application of the Patient Rule Induction Method to Detect Hydrologic Model Behavioural Parameters and Quantify UncertaintyHydrological Processes, 32(8): 1005-1025. (pdf 3.4 MB)

Sabaghy, S., Walker, J. P., Renzullo, L. J. and Jackson, T. J., 2018. Spatially Enhanced Passive Microwave Derived Soil Moisture: Capabilities and Opportunities. Remote Sensing of Environment, 209: 551-580. Copyright 2018 Elsevier Science Ltd. (pdf 1.2 MB)

Gao, Y., Walker, J.P., Ye, N., Panciera, R., Monerris, A., Ryu, D., Rüdiger, C. and Jackson, T. J., 2018. Evaluation of the Tau-Omega Model for Passive Microwave Soil Moisture Retrieval Using SMAPEx Datasets, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, In Press. Accepted 3 January, 2018.   Copyright 2018 IEEE (pdf 1.2MB)

Grimaldi, S., Li., Y., Walker, J. P. and Pauwels, V. R. N., 2018. Effective Representation of River Geometry in Hydraulic Flood Forecast Models. Water Resources Research, 54: 10.1002/2017WR021765. Copyright 2018 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 1.7MB) 

Malbeteau Y., Merlin, O., Balsamo, G., Er-Raki, S., Khabba, S., Walker, J. P. and Jarlan, L., 2018. Towards a Surface Soil Moisture Product at High Spatio-temporal Resolution: Temporally-interpolated Spatially-disaggregated SMOS DataJournal of Hydrometeorology, 19: 183-200. Copyright 2018 American Meteorological Society. (pdf 1.9MB)

Peischl, S., Walker, J.P., Ryu, D. and Kerr, Y., 2018. Analysis of Data Acquisition Time on Soil Moisture Retrieval from Multi-angle L-Band Observations, IEEE Transactions on Geoscience and Remote Sensing, 56(2): 966-971.  Copyright 2018 IEEE (pdf 3.7MB)

Colliander, A., Jackson, T. J., Chan, S. K., O’Neill, P., Bindlish, R., Cosh, M., Caldwell, T., Walker, J. P.,  Berg, A., McNairn, H., Thibeault, M., Martinez-Fernandez, J., Jensen, K.H., Asanuma, J., Seyfreid, M. S., Bosch, D. D., Starks, P., Holifield-Collins, C., Prueger, J. H., Su, Z., Lopez-Baeza, E. and Yueh, S. H., 2018. An assessment of the Differences Between Spatial Resolution and Grid Size for the SMAP Enhanced Soil Moisture Product Over Homogeneous Sites, Remote Sensing of Environment, 201: 65-70. Copyright 2018 Elsevier Science Ltd. (pdf 400 kB)

Li, Y., Grimaldi, S., Pauwels, V. R. N. and Walker, J. P., 2018. Hydrologic Model Calibration Using Remotely Sensed Soil Moisture and Discharge Measurements: The Impact on Predictions at Gauged and Ungauged Locations. Journal of Hydrology, 557: 897-909. Copyright 2018 Elsevier Science Ltd. (pdf 2.3MB)

Liu, S., Li, Y., Pauwels, V. R. N. and Walker, J. P., 2018. Impact of Rain Gauge Quality Control and Interpolation on Streamflow Simulation: An Application to the Warwick Catchment, Australia, Fronteirs of Earth Science, 5: 114. (pdf 2.2MB)

Bindlish, R., Jackson, T. J., Cosh, M. H., Koike, T., Fuiji, X., de Jeu, R., Chan, S., Asanuma, J., Berg, A., Bosch, D., Caldwell, T., Holifield Collins, C., McNairn, H., Martínez-Fernández, J., Prueger, J., Seyfried, M., Starks, P., Su, Z., Thibeault, M., Walker, J. P. and Coopersmith, E., 2018. GCOM-W AMSR2 Soil Moisture Product Validation Using Core Validation Sites, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 11(1): 202-219. Copyright 2018 IEEE (pdf 1.6MB)

Kolassa, J., Reichle, R. H., Liu, Q., Alemohammad, S.H., Gentine, P.,  Aida, K., Asanuma, J., Bircher, S., Caldwell, T., Colliander, A., Holifield-Collins, C., Jackson, T. J., Martinez-Fernandez, J., McNairn, H., Pacheco, A., Thibeault, M. and Walker, J. P., 2018. Estimating Surface Soil Moisture from SMAP Observations Using a Neural Network Technique, Remote Sensing of Environment, 204: 43-59. Copyright 2018 Elsevier Science Ltd. (pdf 6MB)

Chan, S, Bindlish, R., O’Neill, P., Jackson, T., Njoku, E., Dunbar, S., Chaubell, J., Piepmeier, J., Yueh, S., Entekhabi, D., Colliander, A., Chen, F., Cosh, M., Caldwell, T., Walker, J. P., Berg, A., McNairn, H., Thibeault, M., Martínez-Fernández, J., Uldall, F., Seyfried, M., Bosch, D., Starks, P., Holifield-Collins, C., Prueger, J., van der Velde, R., Asanuma, J., Palecki, M., Small, E. E., Zreda, M., Calvet, J., Crow, W. T. and Kerr, Y., 2018. Development and Assessment of the SMAP Enhanced Passive Soil Moisture ProductRemote Sensing of Environment, 204: 931-941. Copyright 2018 Elsevier Science Ltd. (pdf 1.3MB)

Usowicz, B., Lukowski, M.I., Rudiger, C., Walker, J. P. and Marczewski, W., 2017. Thermal Properties of Soil in the Murrumbidgee River Catchment (Australia)International Journal of Heat and Mass Transfer, 115: 604-614. Copyright 2017 Elsevier Science Ltd. (pdf 3.7MB)

Reichle, R. H., De Lannoy, G. J. M., Liu, Q., Ardizzone, J. V., Collinader, A., Conaty, A., Crow, W., Jackson, T. J., Jones, L. A., Kimball, J. S., Koster, R. D., Mahanama, S. P., Smith, E. B., Berg, A., Bircher, S., Bosch, D., Caldwell, T. G., Cosh, M., Gonzalez-Zamora, A., Holifield Collins, C. D., Livingston, S., Lopez-Baeza, E., Martinez-Fernandez, J., McNairn, H., Moghaddam, M., Pacheco, A., Pellarin, T., Prueger, J., Rowlandson, T., Seyfried, M., Starks, P., Zhongbo, S., Thibeault, M., Uldall, F., van der Velde R., Walker, J. P., Wu, X. and Zeng, Y., 2017. Assessment of the SMAP Level 4 Surface and Root Zone Soil Moisture Product Using In Situ Measurements, Journal of Hydrometeorology, 18: 2621-2645. Copyright 2017 American Meteorological Society. (pdf 2.2MB)

Wright, A. J., Walker, J. P. and Pauwels, V. R. N., 2017. Estimating  Rainfall Time Series and Model Parameter Distributions Using Model Data Reduction and Inversion TechniquesWater Resources Research, 53: 6407-6424. Copyright 2017 American Geophysical Union. Further reproduction or electronic distribution is not permitted (pdf 1.7MB)

Sawada, Y., Koike, T., Aida, K., Toride, K. and Walker, J. P., 2017. Fusing Microwave and Optical Satellite Observations to Simultaneously Retrieve Surface Soil Moisture, Vegetation Water Content, and Surface Soil RoughnessIEEE Transactions on Geoscience and Remote Sensing, 55(11): 6195-6206.  Copyright 2017 IEEE (pdf 3.3MB)

Wu, X, Walker, J. P., Rüdiger, C., Panciera, R. and Gao, Y., 2017. Medium-Resolution Soil Moisture Retrieval Using the Bayesian Merging Method, IEEE Transactions on Geoscience and Remote Sensing, 55(11): 6482-6493. Copyright 2017 IEEE (pdf 5MB)

Wright, A. J., Walker, J. P., Robertson, D. E. and Pauwels, V. R. N., 2017. A Comparison of the Discrete Cosine and Wavelet Transforms for Hydrologic Model Input Data ReductionHydrology and Earth System Science, 21(7): 3827-3838. (pdf 9.2MB)

He, L., Qin, Q., Panciera, R., Tanase, M., Walker, J. P. and Hong, Y., 2017. An Extension of the Alpha Approximation Method for Soil Moisture Estimation Using Time-Series SAR Data over Bare Soil SurfacesIEEE Geoscience and Remote Sensing Letters, 14(8): 1328-1332.  Copyright 2017 IEEE (pdf 503kB)

Yee, M.S., Walker, J. P., Rüdiger, C., Parinussa, R. M., Koike, T. and Kerr, Y. H., 2017. A Comparison of SMOS and AMSR2 Soil Moisture Using Representative Sites of the OzNet Monitoring Network, Remote Sensing of Environment, 195: 297-312. Copyright 2017 Elsevier Science Ltd. (pdf 7MB)

Lievens, H., Reichle, R. H., Liu, Q., DeLannoy, G. J. M., Dunbar, R. S., Kim, S. B., Das, N. N., Cosh, M., Walker, J. P. and Wagner, W., 2017. Joint Sentinel-1 and SMAP Data Assimilation to Improve Soil Moisture Estimates, Geophysical Research Letters, 44: 6145-6153. Copyright 2017 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 727kB)

Al-Yaari, A., Wigneron, J. P., Kerr, Y., Rodriguez-Fernandez, N. O’Neill, P. E., Jackson, T. J., De Lannoy, G. J. M., Al Bitar, A., Mialon, A., Richaume, P., Walker, J. P., Mahmoodi, A. and Yueh, S., 2017. Evaluating Soil Moisture Retrievals from ESA’s SMOS and NASA’s SMAP Brightness Temperature Datasets, Remote Sensing of Environment, 193: 257-273. Copyright 2017 Elsevier Science Ltd. (pdf 6.7MB)

Kim, S. B., van Zyl, J. J., Johnson, J. T., Moghaddam, M., Tsang, L., Colliander, A., Dunbar, R. S., Jackson, T. J., Jaruwatanadilok, S., West, R., Berg, A., Caldwell, T., Cosh, M. H., Goodrich, D. C., Livingston, S., Lopez-Baeza, E., Rowlandson, T., Thibeault, M., Walker, J. P., Entekhabi, D., Njoku, E. G., O’Neill, P. E. and Yueh, S. H., 2017. Surface Soil Moisture Retrieval Using the L-Band Synthetic Aperture Radar Onboard the Soil Moisture Active-Passive Satellite and Evaluation at Core Validation Sites, IEEE Transactions on Geoscience and Remote Sensing, 55(4): 1897-1914. Copyright 2017 IEEE (pdf 7.4MB)

Wigneron, J. P., Jackson, T. J., O’Neill, P., De Lannoy, G., de Rosnay, P., Walker, J. P., Ferrazzoli, P., Mironov, V., Bircher, S., Grant, J. P., Kurum, M., Schwank, M., Munoz-Sabater, J., Das, N., Royer, A., Al-Yaari, A., Al Bitar, A., Fernandez-Moran, R., Lawrence, H., Mialon, A., Parrens, M., Richaume, P. Delwart, S. and Kerr, Y., 2017. Modelling the Passive Microwave Signature from Land Surfaces: A Review of Recent Result and Application to the L-band SMOS & SMAP Soil Moisture Retrieval Algorithms, Remote Sensing of Environment, 192: 238-262Copyright 2017 Elsevier Science Ltd. (pdf 3MB)

Colliander, A., Jackson, T., Bindlish, R., Chan, S., Das, N., Kim, S., Cosh, M., Dunbar, S., Dang, L. Pashaian, L., Asanuma, J., Berg, A., Rowlandson, T., Bosch, D., Caldwell, T., Caylor, K., Goodrich, D., al Jassar, H., Lopez-Baeza, E., Martinez-Fernandez, J., Gonzalez-Zamora, A., Livingston, S., McNairn, H., Pacheco, A., Moghaddam, M., Montzka, C., Notarnicola, C., Niedrist, G., Pellarin, T., Prueger, J., Pulliainen, J., Rautiainen, K., Ramos, J., Seyfried, M., Starks, P., Su, B. Zeng, Y., van der Velde, R., Thibeault, M., Dorigo, W., Vreugdenhil, M., Walker, J. P., Wu, X., Monerris-Belda, S., O’Neill, P., Entekhabi, D., Njoku, E. and Yueh, S., 2017. Validation of SMAP Surface Soil Moisture Products with Core Validation Sites, Remote Sensing of Environment, 191: 215-231. Copyright 2017 Elsevier Science Ltd. (pdf 3.3MB)

Tian, S., Tregoning, P., Renzullo, L. J., VanDijk, A. I. J. M., Walker, J. P., Pauwels, V. R. N. and Allgeyer, S., 2017. Improved Water Balance Component Estimates Through Joint Assimilation of GRACE Water Storage and SMOS Soil Moisture Retrievals, Water Resources Research, 53(3): 1820-1840. Copyright 2017 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 8.2MB) 

Wu, X., Walker, J. P., Rüdiger, C., Panciera, R. and Gao, Y., 2017. Intercomparison of Alternate Soil Moisture Downscaling Algorithms Using Active-Passive Microwave Observations, IEEE Geoscience and Remote Sensing Letters, 14(2): 179-183.   Copyright 2017 IEEE (pdf 1.2MB)

Vinodkumar., Dharssi, I., Bally, J., Steinle, P., McJannet, D. and Walker, J., 2017. Comparison of Soil Wetness from Multiple Models over Australia with Observations, Water Resources Research, 53(1): 633-646. Copyright 2017 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 1.2MB)

Ouellette, J. D., Johnson, J. T., Balenzano, A., Mattia, F., Satalino, G., Kim, S., Dunbar, S., Colliander, A., Cosh, M. H., Caldwell, T. G., Walker, J. P. and Berg, A. A., 2017. A Time-Series Approach to Estimating Soil Moisture from Vegetated Surfaces Using L-band Radar Backscatter, IEEE Transactions on Geoscience and Remote Sensing, 55(6):  3186-3193.  Copyright 2017 IEEE (pdf 3.1MB)

Dumedah, G. and Walker, J. P., 2017.  Assessment of Model Behaviour and Acceptable Forcing Data Uncertainty in the Context of Land Surface Soil Moisture EstimationAdvances in Water Resources, 101: 23-36. Copyright 2017 Elsevier Science Ltd. (pdf 2.8MB)

Azmi, M., Rüdiger, C. and Walker, J. P., 2017. Statistical Analysis of Short-Term Water Stress Conditions at Riggs Creek OzFlux Tower SiteTheoretical and Applied Climatology, 130: 497-509. (pdf 1.4MB)

Alonso-Arroyo, A., Camps, A., Monerris, A., Rüdiger, C., Walker, J. P., Onrubia, R., Querol, J., Park, H. and Pascual, D., 2016. On the Correlation Between GNSS-R Reflectivity and L-Band Microwave Radiometry: Towards An Improved Soil Moisture Monitoring IEEE Journal of Selected Topics in Applied Earth Observation and Remote Sensing, 9(12): 5862-5879.  Copyright 2016 IEEE (pdf 8.1MB)

Beringer, J., Hutley, L. B., McHugh, I., Arndt, S. K., Campbell, D., Cleugh, H. A., Cleverly, J., Resco de Dios, V., Eamus, D., Evans, B., Ewenz, C., Grace, P., Griebel, A., Haverd, V., Hinko-Najera, N., Huete, A., Isaac, P., Kanniah, K., Leuning, R., Liddell, M. J., Macfarlane, C., Meyer, W., Moore, C., Pendall, E., Phillips, A., Phillips, R. L., Prober, S. M., Restrepo-Coupe, N., Rutledge, S., Schroder, I., Silberstein, R., Southall, P., Yee, M., Tapper, N. J., van Gorse, E., Vote, C., Walker, J. P. and Wardlaw, T., 2016. An Introduction to the Australian and New Zealand Flux Tower Network – OzFluxBiogeosciences13: 5895-5916. (pdf 9.7MB)

Shellito, P. J., Small, E. E., Colliander, A., Bindlish, R., Cosh, M. H., Berg, A., Bosch, D. D., Caldwell, T. G., Goodrich, D. C., McNairn, H., Prueger, J., Starks, P. J., van der Velde, R. and Walker, J. P., 2016. SMAP Soil Moisture Drying More Rapid Than Observed In Situ Following Rainfall EventsGeophysical Research Letters43: doi:10.1002/2016GL069946. Copyright 2016 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 466kB)

Li, Y., Grimaldi, S., Walker, J.P. and Pauwels, V.R.N., 2016. Application of Remote Sensing Data to Constrain Operational Rainfall-Driven Flood Forecasting: A ReviewRemote Sensing8(456): doi:10.3390/rs8060456. (pdf 737kB)

Kang, Y., Ozdogan, M., Zipper, S.C., Roman, M.O., Walker, J.P., Hong, S.Y., Marshall, M., Magliulo, E., Moreno, J., Alonso, L., Miyata, A., Kimball, B., and Loheide II, S.P., 2016. How Universal is the Relationship between Remotely Sensed Vegetation Indices and Crop Leaf Area Index? A Global AssessmentRemote Sensing, 8(597): doi:10.3390/rs8070597. (pdf 2.6MB)

Chan, S., Bindlish, R., O’Neill, P., Njoku, E., Jackson, T., Colliander, A., Chen, F., Burgin, M., Dunbar, S., Piepmeier, J., Yueh, S., Entekhabi, D., Cosh, M., Caldwell, T., Walker, J., Wu, X., Berg, A., Rowlandson, T., Pacheco, A., McNairn, H., Thibeault, M., Martinez-Fernandez, J., Gonzalez-Zamora, A., Seyfried, M., Bosch, D., Starks, P., Goodrich, D., Prueger, J., Palecki, M., Small, E., Calvet, J-C., Crow, W. and Kerr, Y, 2016. Assessment of the SMAP Level 2 Passive Soil Moisture ProductIEEE Transactions on Geoscience and Remote Sensing54(8): 4994-5007. Copyright 2016 IEEE (pdf 3.8MB)

He, L., Panciera, R., Tanase, M. A., Walker, J. P. and Qin, Q., 2016. Soil Moisture Retrieval in Agricultural Fields Using Adaptive Model-based Polarimetric Decomposition of SAR DataIEEE Transactions on Geoscience and Remote Sensing54(8): 4445-4460. Copyright 2016 IEEE (pdf 3.2MB)

Holgate, C. M., De Jeu, R. A. M, van Dijk, A. I. J. M., Liu, Y. Y., Renzullo, L. J., Kumar, V., Dharssi, I., Parinussa, R., Van Der Schalie, R., Gevaert, A., Walker, J., McJannet, D., Cleverly, J., Haverd, V., Trudinger, C.M. and Briggs, P. R., 2016. Comparison of Remotely Sensed and Modelled Soil Moisture Data Sets Across AustraliaRemote Sensing of Environment186: 479-500. Copyright 2016 Elsevier Science Ltd. (pdf 1.4MB)

Grimaldi, S., Li, Y., Pauwels, V. R. N. and Walker, J. P., 2016. Remote Sensing-Derived Water Extent and Level to Constrain Hydraulic Flood Forecasting Models: Opportunities and ChallengesSurveys in Geophysics37(5): 977-1034. (pdf 2.1MB)

Fieber, K. D., Davenport, I. J., Ferryman, J. M., Gurney, R. J., Becerra, V. M., Walker, J. P. and Hacker, J. M., 2016. CHP Toolkit: Case Study of LAIe Sensitivity to Discontinuity of Canopy Cover in Fruit PlantationsIEEE Transactions on Geoscience and Remote Sensing54(9): 5071-5080. Copyright 2016 IEEE (pdf 656kB)

Shahrban, M., Walker, J. P., Wang, Q. J., Seed, A. and Steinle, P., 2016. An Evaluation of Numerical Weather Prediction Based Rainfall ForecastsHydrological Sciences Journal61(15): 2704-2717. (pdf 2.3MB)

Lievens, H., De Lannoy, G. J. M., Al Bitar, A., Drusch, M., Dumedah, G. Hendricks-Franssen, H.-J., Kerr, Y. H., Tomer, S. K., Martens, B., Merlin, O., Pan, M., Roundy, J. K., Vereecken, H., Walker, J. P., Wood, E. F., Verhoest, N. E. C. and Pauwels, V. R. N., 2016. Assimilation of SMOS Soil Moisture and Brightness Temperature Products into a Land Surface ModelRemote Sensing of Environment180: 292-304. Copyright 2016 Elsevier Science Ltd. (pdf 1.4MB)

Yee, M. S., Walker, J. P., Monerris, A., Rüdiger, C. and Jackson, T. J., 2016. On the Identification of Representative In-situ Soil Moisture Monitoring Stations for the Validation of SMAP Soil Moisture Products in AustraliaJournal of Hydrology537: 367-381. Copyright 2016 Elsevier Science Ltd. (pdf 2.4MB)

Moghaddam, N. F., Samsonov, S. V., Rüdiger, C., Walker, J. P. and Hall, W. D. M., 2016. Multi-temporal SAR Observations of the Surat Basin in Australia for Deformation Scenario Evaluation Associated with Man-made InteractionsEnvironmental Earth Sciences75(4):282, 16pp. (pdf 22MB)

Azmi, M., Rüdiger, C. and Walker, J. P., 2016. A Data Fusion-Based Drought IndexWater Resources Research52, doi:10.1002/2015WR017834. Copyright 2016 American Geophysical Union. Further reproduction or electronic distribution is not permitted (pdf 2.9MB)

Huang, Y., Walker, J. P., Gao, Y., Wu, X. and Monerris-Belda, A., 2015. Estimation of Vegetation Water Content from the Radar Vegetation Index at L-bandIEEE Transactions on Geoscience and Remote Sensing, DOI 10.1109/TGRS.2015.2471803. Copyright 2015 IEEE (pdf 3.1MB)

Sawada, Y., Koike, T., and Walker, J. P., 2015. A Land Data Assimilation System for Simultaneous Simulation of Soil Moisture and Vegetation DynamicsJournal of Geophysical Research – Atmospheres120: 5910-5930. Copyright 2015 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 1.9MB)

Lievens H., Al Bitar A., Verhoest, N. E. C., Cabot, F., De Lannoy, G. J. M., Drusch, M., Dumedah, G., Hendricks-Franssen, H.-J., Kerr, Y., Tomer, S. K., Martens, B., Merlin, O., Pan M., van den Berg, M. J., Vereecken, H., Walker, J. P., Wood, E. F., Pauwels, V. R. N., 2015. Optimization of a Radiative Transfer Forward Operator for Simulating SMOS Brightness Temperatures over the Upper Mississippi BasinJournal of Hydrometeorology16: 1109-1134. Copyright 2015 American Meteorological Society. (pdf 4.3MB)

Verhoest, N. E. C., van den Berg, M. J., Martens, B., Lievens, H., Wood, E. F., Pan, M., Kerr, Y., Al Bitar, A., Tomer, S., Drusch, M., Vernieuwe, H., De Baets, B., Walker, J. P., Dumedah, G. and Pauwels, V. R. N., 2015. Copula-based Downscaling of Coarse-Scale Soil Moisture Observations with Implicit Bias CorrectionIEEE Transactions on Geoscience and Remote Sensing53(6): 3507-3521. Copyright 2015 IEEE(pdf 2.2MB)

Dumedah, G., Walker, J. P., and Merlin, O., 2015. Root-zone Soil Moisture Estimation from Assimilation of Downscaled Soil Moisture and Ocean Salinity DataAdvances in Water Resources84: 14-22. Copyright 2015 Elsevier Science Ltd. (pdf 2.7MB)

Lievens, H., Tomer S. K., Al Bitar, A., De Lannoy, G. J. M., Drusch, M., Dumedah, G., Hendricks-Franssen, H.-J., Kerr, Y. H., Martens, B., Pan, M., Roundy, J. K., Vereecken, H., Walker, J. P., Wood, E. F., Verhoest N. E. C., Pauwels, V. R. N., 2015. SMOS Soil Moisture Assimilation for Improved Hydrologic Simulation in the Murray Darling Basin, AustraliaRemote Sensing of Environment168: 146-162. Copyright 2015 Elsevier Science Ltd. (pdf 4.5MB)

Costelloe, J. F., Matic, V., Western, A. W., Walker, J. P., Tyler, M., 2015. Determining Vertical Leakage from the Great Artesian Basin, Australia, Through Up-scaling Field Estimates of Phreatic EvapotranspirationJournal of Hydrology529: 1079-1094. Copyright 2015 Elsevier Science Ltd. (pdf 3.8MB)

Ye, N., Walker, J. P., Guerschman, J., Ryu, D., and Gurney, R. J., 2015. Standing Water Effect on Soil Moisture Retrieval From L-band Passive Microwave ObservationsRemote Sensing of Environment169: 232-242. Copyright 2015 Elsevier Science Ltd. (pdf 3.9MB)

Gao, Y., Walker, J. P., Allahmoradi, M., Monerris, A., Ryu, D. and Jackson, T. J., 2015. Optical Sensing of Vegetation Water Content: A Synthesis StudyIEEE Journal of Selected Topics in Remote Sensing8(4): 1456-1464. Copyright 2015 IEEE (pdf 1.8MB)

Ye, N., Walker, J. P., and Rüdiger, C., 2015. A Cumulative Distribution Function Method for Normalizing Variable-angle Microwave ObservationsIEEE Transactions on Geoscience and Remote Sensing53(7): 3906-3916. Copyright 2015 IEEE (pdf 1.7MB)

Woodland, R. J., Thomson, J. R., MacNally, R., Reich, P., Evrard, V., Wary, F. Y., Walker, J. P., and Cook, P. L. M., 2015. Nitrogen Loads Explain Primary Productivity in Estuaries at the Ecosystem ScaleLimnology and Oceanography, doi:10.1002/lno.10136 (pdf 847kB)

Yee, M. S., Pauwels, V. R. N., Daly, E., Beringer, J., Rüdiger, C., McCabe, M.,  and Walker, J. P., 2015. A Comparison of Optical and Microwave Scintillometers with Eddy Covariance Derived Surface Heat FluxesAgricultural and Forest Meteorology213: 226-239. (pdf 1.45MB)

Teluguntla, P., Ryu, D., George, B., Walker, J. P., Malano, H. M., 2015. Mapping Flooded Rice Paddies Using Time Series of MODIS Imagery in the Krishna River Basin, IndiaRemote Sensing7: 8858-8882. (pdf 3.9MB)

Fieber, K. D., Davenport, I. J., Tanase, M. A., Ferryman, J. M., Gurney, R. J., Becerra, V. M., Walker, J. P., and Hacker, J. M., 2015. Validation of Canopy Height Profile Methodology for Small-footprint Full-waveform Airborne LiDAR data in a Discontinuous Canopy EnvironmentISPRS Journal of Photogrammetry and Remote Sensing104: 144-157. (pdf 2.9MB)

Rahmati, M., Oskouei, M., Neyshabouri, M., Walker, J. P., Fakherifard, A., Ahmadi, A., Mousavi, S. B., 2015. Soil Moisture Derivation Using Triangle Method in the Lighvan Watershed, North Western IranJournal of Soil Science and Plant Nutrition15(1): 167-178. (pdf 1.4MB)

Bandara, R., Walker, J. P., Rüdiger, C., and Merlin, O., 2015. Towards Soil Property Retrieval from Space: An Application with Disaggregated Satellite ObservationsJournal of Hydrology522:582-593. Copyright 2015 Elsevier Science Ltd. (pdf 3.4MB)

Wu, X., Walker, J. P., Rüdiger, R., Panciera, R. and Gray, D. A., 2015. Effect of Land Cover Type on the SMAP Active/Passive Soil Moisture Downscaling Algorithm PerformanceIEEE Geoscience and Remote Sensing Letters12(4): 846-850. Copyright 2015 IEEE (pdf 502kB)

Wu, X., Walker, J. P., Rüdiger, R., Panciera, R. and Gray, D., 2015. Simulation of the SMAP Data Stream from SMAPEx Field Campaigns in AustraliaIEEE Transactions on Geoscience and Remote Sensing53(4): 1921-1934. Copyright 2015 IEEE (pdf 1.8MB)

Rahmati, M., Mohammad-Oskooei, M., Neyshabouri, M. R., Fakherifard, A., Ahmadi, A., Walker, J. P., 2014. ETM+ Data Applicability for Remote Sensing of Soil Salinity in Lighvan Watershed, Northwest of IranCurrent Opinion in Agriculture3(1): 10-13. (pdf 1.6MB)

Dumedah, G. and Walker, J. P., 2014. Intercomparison of the JULES and CABLE Land Surface Models Through Assimilation of Remotely Sensed Soil Moisture in Southeast AustraliaAdvances in Water Resources74: 231-244. Copyright 2014 Elsevier Science Ltd. (pdf 3.2MB)

Dumedah, G., Walker, J. P., 2014. Assessment of Land Surface Model Uncertainty: A Crucial Step Towards Identification of Model WeaknessesJournal of Hydrology519: 1474-1484. Copyright 2014 Elsevier Science Ltd. (pdf 1.9MB)

Wu, X., Walker, J. P., Das, N., Panciera, R., Rüdiger, C., 2014. Evaluation of the SMAP Brightness Temperature Downscaling Algorithm using Active and Passive Microwave ObservationsRemote Sensing of Environment155: 210-221. Copyright 2014 Elsevier Science Ltd. (pdf 2.0MB)

Dumedah, G., Walker, J. P. and Chik, L., 2014. Assessing Artificial Neural Networks and Statistical Methods for Infilling Missing Soil Moisture RecordsJournal of Hydrology515: 330-344. Copyright 2014 Elsevier Science Ltd. (pdf 3.7MB)

Rüdiger, C., Doubkova, M., Larsen, J. R., Wagner, W., Walker, J. P., 2014. Similarities Between Spaceborne Active and Airborne Passive Microwave Observations at 1km ResolutionIEEE Geoscience and Remote Sensing Letters11(12): 2178-2182. Copyright 2014 IEEE (pdf 850kB)

Alonso-Arroyo, A., Camps, A., Aguasca, A., Forte, G., Monerris, A., Rüdiger, C., Walker, J.P., Park, H., Pascual, D. and Onrubia., R., 2014. Improving the Accuracy of Soil Moisture Retrievals Using the Phase Difference of the Dual-Polarization GNSS-R Interference PatternsIEEE Geoscience and Remote Sensing Letters11(12): 2090-2094. Copyright 2014 IEEE (pdf 1.0MB)

Alonso-Arroyo, A., Camps, A., Monerris, A., Rüdiger, C., Walker, J. P., Forte, G., Pascual, D., Park, H., Onrubia, R., 2014. Dual-Polarization GNSS-R Interference Pattern Technique for Soil Moisture MappingIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing7(5): 1533-1544. Copyright 2014 IEEE (pdf 2.1MB)

Bandara, R., Walker, J. P., and Rüdiger, C., 2014. Towards Soil Property Retrieval from Space: Proof of Concept Using In-Situ ObservationsJournal of Hydrology512: 27-38. Copyright 2014 Elsevier Science Ltd. (pdf 2.6MB)

Tanase, M., Panciera, R., Lowell, K., Tian, S., Hacker, J., and Walker, J. P., 2014. Airborne Multi-temporal L-band Polarimetric SAR Data for Biomass Estimation in Semi-Arid ForestsRemote Sensing of Environment145: 93-104, http://dx.doi.org/10.1016/j.rse.2014.01.024 Copyright 2014 Elsevier Science Ltd. (pdf 1.2MB)

Fieber, K., Davenport, I., Tanase, M. A., Ferryman, J. M., Gurney, R. J., Walker, J. P., Hacker, J. M., 2014. Effective LAI and CHP of a Single Tree from Small-Footprint Airborne Full-Waveform LiDARIEEE Geoscience and Remote Sensing Letters11(9): 1634-1638. Copyright 2014 IEEE(pdf 303kB)

Tanase, M., Panciera, R., Lowell, K., Tian, S., Garcia-Martin, A., and Walker, J. P., 2014. Sensitivity of L-band Radar Backscatter to Forest Biomass in Semiarid Environments: A Comparative Analysis of Parametric and Nonparametric ModelsIEEE Transactions on Geoscience and Remote Sensing52(8): 4671-4685. Copyright 2014 IEEE (pdf 1.5MB)

Dumedah, G., and Walker, J. P., 2014. Evaluation of Model Parameter Convergence When Using Data Assimilation for Soil Moisture EstimationJournal of Hydrometeorology15(1): 359-375. Copyright 2014 American Meteorological Society. (pdf 3.8MB)

Panciera, R., Tanase, M., Lowell, K., Walker, J. P., 2014. Evaluation of IEM, Dubois and Oh Radar Backscatter Models using Airborne L-band SARIEEE Transactions on Geoscience and Remote Sensing52(8): 4966-4979. Copyright 2014 IEEE (pdf 1.2MB)

Dumedah, G., Walker, J. P., and Rüdiger, C., 2014. Can SMOS Data be Used Directly on the 15km Discrete Global Grid?IEEE Transaction on Geoscience and Remote Sensing52(5): 2538-2544. Copyright 2014 IEEE (pdf 2.6MB)

Li, D., Jin, R., Che, T., Walker, J. P., Gao, Y., Ye, N., and Wang, S., 2014. Soil Moisture Retrieval from Airborne PLMR and MODIS Products in Zhangye Oasis of Heihe River Basin, ChinaAdvances in Earth Science29(2): 295-305. In Chinese (pdf 12.2MB)

Peischl, S., Walker, J. P., Ye, N., Ryu, D., Kerr, Y., 2014. Sensitivity of Multi-Parameter Soil Moisture retrievals to Incidence Angle ConfigurationRemote Sensing of Environment143: 64-72, http://dx.doi.org/10.1016/j.rse.2013.11.019, Copyright 2014 Elsevier Science Ltd. (pdf 667kB)

Rüdiger, C., Walker, J. P., Kerr, Y. H., Kim, E. J., Hacker, J. M., Gurney, R., Barrett, D., and Le Marshall, J., 2014. Towards Vicarious Calibration of Microwave Remote Sensing Satellites in Arid EnvironmentsIEEE Transactions on Geoscience and Remote Sensing52(3): 1749-1760, Copyright 2014 IEEE (pdf 1.3MB)

Tanase, M. A., Panciera, R., Lowell, K., Aponte, C., Hacker, J. M. and Walker, J. P., 2014. Forest Biomass Estimation at High Spatial Resolution: Radar vs Lidar SensorsIEEE Geoscience and Remote Sensing Letters11(3): 711-715, doi:10.1109/LGRS.2013.2276947.(pdf 514kB)

Turner, R., Panciera, R., Tanase, M., Lowell, K., Hacker, J., Walker, J. P., 2014. Estimation of Soil Surface Roughness of Agricultural Soils Using Airborne LiDARRemote Sensing of Environment140: 107-117. Copyright 2014 Elsevier Science Ltd. (pdf 2.1MB)

Panciera, R., Walker, J. P., Jackson, T. J., Gray, D., Tanase, M. A., Ryu, D., Monerris, A., Yardley, H., Rüdiger, C., Wu, X., Gao, Y., Hacker, J., 2014. The Soil Moisture Active Passive Experiments (SMAPEx): Towards Soil Moisture Retrieval from the SMAP MissionIEEE Transaction on Geoscience and Remote Sensing52(1): 490-507. Copyright 2014 IEEE. (pdf 2.5MB)

Pipunic, R. C., Walker, J. P., Western, A. W. and Trudinger, C. M., 2013. Assimilation of Multiple Data Types for Improved Heat Flux Prediction: A One-dimensional Field StudyRemote Sensing of Environment136: 315-329, doi: http://dx.doi.org/10.1016/j.rse.2013.05.015. Copyright 2013 Elsevier Science Ltd. (pdf 1.2MB)

Bandara, R., Walker, and Rüdiger, C., 2013. Towards Soil Property Retrieval from Space: A one-dimensional Twin ExperimentJournal of Hydrology497: 198-207, doi: http://dx.doi.org/10.1016/j.jhydrol.2013.06.004. Copyright 2013 Elsevier Science Ltd. (pdf 1.3MB)

Fieber, K. D., Davenport, I. J., Ferryman, J., Gurney, R., and Walker, J. P., 2013. Analysis of Full-waveform LiDAR data for Classification of an Orange Orchard SceneISPRS Journal of Photogrammetry and Remote Sensing82: 63-82, doi: http://dx.doi.org/10.1016/j.isprsjprs.2013.05.002. (pdf 12MB)

Teluguntla, P., Ryu, D., George, B., and Walker, J. P., 2013. Multidecadal Trend of Basin-scale Evapotranpiration Estimated Using AVHRR Data in the Krishna River Basin, IndiaVadose Zone Journal, 12(3): doi:10.2136/vzj2012.0118 (pdf 4.5MB)

Vreugdenhil, M., de Jeu, R., and Walker, J. P., 2013. Identification of Claypans from AMSR-E Passive Microwave ObservationsInternational Journal of Remote Sensing34(14):5201-5212, doi: http://dx.doi.org/10.1080/01431161.2013.788801 (pdf2.5MB).

Ershadi, A., McCabe, M. F., Evans, J. P. and Walker, J. P., 2013. Effects of Spatial Aggregation on the Multi-scale Estimation of EvapotranspirationRemote Sensing of Environment131: 51-62. Copyright 2013 Elsevier Science Ltd. (pdf 3.3MB)

Smith, A. B., Walker, J. P., Western, A. W., Young, R. I., Ellett, K. M., Pipunic, R. C., Grayson, R. B., Siriwidena, L., Chiew, F. H. S., and Richter, H., 2012. The Murrumbidgee Soil Moisture Monitoring Network Data SetWater Resources Research48, W07701, 6pp, doi:10.1029/2012WR011976. Copyright 2012 American Geophysical Union. Further reproduction or electronic distribution is not permitted (pdf 650kB)

Peischl, S., Walker, J., Rüdiger, C., Ye, N., Kerr, Y., Kim, E., Bandara, R. and Allahmoradi, M., 2012. The AACES Field Experiments: SMOS Calibration and Validation Across the Murrumbidgee River CatchmentHydrology and Earth System Science16: 1697-1708, doi:10.5194/hess-16-1697-2012. (pdf 11.2MB)

Bircher, S., Skou, N., Jensen, K. H., Walker, J. P. and Rasmussen, L., 2012. A Soil Moisture and Temperature Network for SMOS Validation in Western DenmarkHydrology and Earth System Science16: 1445-1463, doi:10.5194/hess-16-1445-2012. (pdf 4.6MB)

Crow, W. T., Berg, A. A., Cosh, M. H., Loew, A., Mohanty, B. P., Panciera, R., de Rosnay, P., Ryu, D., and Walker, J. P., 2012. Upscaling Sparse Ground-based Soil Moisture Observations for the Validation of Coarse-resolution Satellite Soil Moisture ProductsReviews of Geophysics50, RG2002, doi: 10.1029/2011RG000372. (pdf 889kB)

McColl, K. A., Ryu, D., Matic V., Walker, J. P., Costelloe, J. and Rüdiger, C., 2012. Soil Salinity Impacts on L-band Remote Sensing of Soil MoistureIEEE Geoscience and Remote Sensing Letters9(2): 262-266, doi:10.1109/LGRS.2011.2165932. (pdf 442kB)

Peischl, S., Walker, J. P., Ryu, D., Kerr, Y., Panciera, R., and Rüdiger, C., 2012. Wheat Canopy Structure and Surface Roughness Effects on Multi-angle Observations at L-bandIEEE Transactions on Geoscience and Remote Sensing50(5): 1498-1506, doi:10.1109/TGRS.2011.2174644. Copyright 2012 IEEE. (pdf 560kB)

Merlin, O., Rüdiger, C., Al Bitar, A., Richaume, P., Walker, J. P. and Kerr, Y., 2012. Disaggregation of SMOS Soil Moisture in Southeastern AustraliaIEEE Transactions on Geoscience and Remote Sensing50(5), doi:10.1109/TGRS.2011.2175000. Copyright 2012 IEEE (pdf 1.27MB)

Merlin, O., Jacob, F., Wigneron, J-P, Walker, J. P. and Chehbouni, G., 2012. Multidimensional Disaggregation of Land Surface Temperature Using High-Resolution Red, Near-Infrared, Shortwave-Infrared, and Microwave-L BandsIEEE Transactions on Geoscience and Remote Sensing50(5), doi:10.1109/TGRS.2011.2169802. Copyright 2012 IEEE (pdf 1.20MB)

Mladenova, I., Lakshmi, V., Jackson, T., Walker, J. P., Merlin, O. and de Jeu, R. A. M., 2011. Validation of AMSR-E Soil Moisture Using L-band Airborne Radiometer Data from the National Airborne Field Experiment 2006Remote Sensing of Environment115(8): 2096-2103. Copyright 2011 Elsevier Science Ltd. (pdf 878kB)

Panciera, R., Walker, J. P., Kalma, J. and Kim, E., 2011. A Proposed Extension to the Soil Moisture and Ocean Salinity Level 2 Algorithm for Mixed Forest and Moderate Vegetation PixelsRemote Sensing of Environment115(12):3343-3354. doi:10.1016/j.rse.2011.07.017. Copyright 2011 Elsevier Science Ltd. (pdf 1.1MB)

Piles, M., Camps, A., Vall-llosera, M., Corbella, I., Panciera, R., Rüdiger, C., Kerr, Y. and Walker, J. P., 2011. Downscaling SMOS-Derived Soil Moisture Using MODIS Visible/Infrared DataIEEE Transactions on Geoscience and Remote Sensing49(9):3156-3166. doi:10.1109/TGRS.2011.2120615. Copyright 2011 IEEE (pdf 1.63MB)

Rüdiger, C., Walker, J. P., Kerr, Y. H., 2011. On The Airborne Spatial Coverage Requirement for Microwave Satellite ValidationIEEE Geoscience and Remote Sensing Letters8(4):824-828. doi:10.1109/LGRS.2011.2116766. (pdf 583kB)

Calvet, J-C., Wigneron, J-P., Walker, J. P., Karbou, F., Chanzy, A. and Albergel, C., 2011. Sensitivity of Passive Microwave Observations to Soil Moisture and Vegetation Water Content: L-band to W-bandIEEE Transactions on Geoscience and Remote Sensing49(4):1190-1199. doi:10.1109/TGRS.2010.2050488. Copyright 2011 IEEE (pdf 1.23MB)

Draper, C., Mahfouf, J-F. and Walker, J. P., 2011. Root zone Soil Moisture From the Assimilation of Screen-level Variables and Remotely Sensed Soil Moisture, Journal of Geophysical Research – Atmospheres116, D02127, doi:10.1029/2010JD013829, 13pp. Copyright 2011 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 1.6MB)

Merlin, O., Al Bitar, A., Walker, J. P. and Kerr, Y., 2010. An Improved Algorithm for Disaggregating Microwave-Derived Soil Moisture Based on Red, Near-infrared and Thermal-infrared DataRemote Sensing of Environment114: 2305-2316, doi:10.1016/j.rse.2010.05.007. Copyright 2010 Elsevier Science Ltd. (pdf 1.5MB)

Albergel, C., Calvet, J-C., Mahfouf, J-F., Rüdiger, C., Barbu, A. L., Lafont, S., Roujean, J. -L., Walker, J. P., Crapeau, M. and Wigneron, J-P., 2010. Monitoring of Water and Carbon Fluxes Using a Land Data Assimilation System: A Case Study for Southwestern FranceHydrology and Earth System Science14: 1109-1124, doi:10.5194/hess-14-1109-2010. (pdf 10.5MB)

Grant, J. P., Van de Griend, A. A., Wigneron, J-P., Saleh, K., Panciera, R. and Walker, J. P., 2010. Influence of Forest Cover Fraction on L-band Soil Moisture Retrievals from Heterogeneous Pixels using Multi-Angular ObservationsRemote Sensing of Environment114: 1026-1037. doi:10.1016/j.rse.2009.12.016 Copyright 2010 Elsevier Science Ltd. (pdf 1.4MB)

Mladenova, I., Lakshmi, V., Walker, J. P., Panciera, R., Wagner, W. and Doubkova, M., 2010. Validation of the ASAR Global Monitoring Mode Soil Moisture Product Using the NAFE05 Data Set. IEEE Transaction on Geoscience and Remote Sensing48(6): 2498-2508. doi:10.1109/TGRS.2010.2040746 Copyright 2010 IEEE (pdf 804kB)

Rüdiger, C., Albergel, C., Mahfouf, J. -F., Calvet, J. -C. and Walker, J. P., 2010. Evaluation of the Observation Operator Jacobian for Leaf Area Index Data Assimilation with an Extended Kalman FilterJournal of Geophysical Research – Atmospheres115, D09111, doi:10.1029/2009JD012912, 10pp. Copyright 2010 American Geophysical Union. Further reproduction or electronic distribution is not permitted (pdf 404kB)

Rüdiger, C., Western, A. W., Walker, J. P., Smith, A. B., Kalma, J. D. and Willgoose, G. R., 2010. Towards a General Equation for Frequency Domain ReflectometersJournal of Hydrology, 383: 319-329. doi:10.1016/j.jhydrol.2009.12.046 Copyright 2010 Elsevier Science Ltd. (pdf 776kB)

Chai, S. -S., Walker, J. P., Makarynskyy, O., Kuhn, M., Veenendaal, B. and West, G., 2010. Use of Soil Moisture Variability in Artificial Neural Network Retrieval of Soil MoistureRemote Sensing2: 166-190, doi:10.3390/rs2010166. (pdf 539kB)

Zhang, Y., Leuning, R., Hutley, L. B., Beringer, J., McHugh, I. and Walker, J. P., 2010. Using Long-term Water Balances to Parameterize Surface Conductances and Calculate Evaporation at 0.05o Spatial ResolutionWater Resources Research46(5), W05512, doi:10.1029/2009WR008716, 14pp. Copyright 2010 American Geophysical Union. Further reproduction or electronic distribution is not permitted (pdf 1.2MB)

Mladenova, I., Lakshmi, V., Walker, J. P., Long, D. and De Jeu, R., 2009. An Assessment of QuickSCAT Ku Band Scatterometer Data for Soil Moisture SensitivityIEEE Geoscience and Remote Sensing Letters6(4): 640-643, doi:10.1109/LGRS.2009.2021492. (pdf 343kB)

de Jeu, R. A. M., Holmes, T. R. H., Panciera, R. and Walker, J. P., 2009. Parameterization of the Land Parameter Retrieval Model for L-band Observations using the NAFE’05 DatasetIEEE Geoscience and Remote Sensing Letters6(4): 630-634, doi:10.1109/LGRS.2009.2019607. (pdf 218kB)

Merlin, O., Walker, J. P., Panciera, R., Escorihuela, M. J. and Jackson, T., 2009. Assessing the SMOS Soil Moisture Retrieval Parameters with High-resolution NAFE’06 DataIEEE Geoscience and Remote Sensing Letters6(4): 635-639, doi:10.1109/LGRS.2009.2012727. (pdf 389kB)

Summerell, G., Shoemark, V., Grant, S. and Walker, J. P., 2009. Using Passive Microwave Response to Soil Moisture Change for Soil Mapping: A Case Study for the Livingstone Creek CatchmentIEEE Geoscience and Remote Sensing Letters6(4): 649-652, doi:10.1109/LGRS.2009.2015967. (pdf 535kB)

Panciera, R., Walker, J. P. and Merlin, O., 2009. Improved Understanding of Soil Surface Roughness Parameterization for L-band Passive Microwave Soil Moisture RetrievalIEEE Geoscience and Remote Sensing Letters6(4): 625-629, doi:10.1109/LGRS.2009.2013369. (pdf 373kB)

Draper, C. S., Mahfouf, J. -F. and Walker, J. P., 2009. An EKF Assimilation of AMSR-E Soil Moisture into the ISBA Land Surface SchemeJournal of Geophysical Research – Atmospheres114, D20104, doi:10.1029/2008JD011650 Copyright 2009 American Geophysical Union. Further reproduction or electronic distribution is not permitted.(pdf 4.8MB)

Merlin, O., Al Bitar, A., Walker, J. P. and Kerr, Y., 2009. A Sequential Model for Disaggregating Near-Surface Soil Moisture Observations Using Multi-Resolution Thermal SensorsRemote Sensing of Environment113(10): 2275-2284. Copyright 2009 Elsevier Science Ltd. (pdf 835kB)

Saleh, K., Kerr, Y., Richaume, P., Escorihuela, M., Panciera, R., Delwart, S., Boulet, G., Maisongrande, P., Walker, J. P., Wursteisen, P. and Wigneron, J. P., 2009. Soil Moisture Retrievals at L-band Using a Two-Step Inversion Approach (COSMOS/NAFE’05 Experiment)Remote Sensing of Environment113(6): 1304-1312. Copyright 2009 Elsevier Science Ltd. (pdf 658kB)

Panciera, R., Walker, J. P., Kalma, J. D., Kim, E. J., Saleh, K. and Wigneron, J-P., 2009. Evaluation of the SMOS L-MEB Passive Microwave Soil Moisture Retrieval AlgorithmRemote Sensing of Environment113(2): 435-444, doi:10.1016/j.rse.2008.10.010. Copyright 2009 Elsevier Science Ltd. (pdf 1.4MB)

Draper, C. S., Walker, J. P., Steinle, P. J., de Jeu, R. A. M. and Holmes, T. R. H., 2009. An Evaluation of AMSR-E Derived Soil Moisture over Australia. Remote Sensing of Environment113:703-710, doi:10.1016/j.rse.2008.11.011. Copyright 2009 Elsevier Science Ltd. (pdf 1.4MB)

Merlin, O., Walker, J. P., Kalma, J. D., Kim, E., Hacker, J., Panciera, R., Young, R., Summerell, G., Hornbuckle, J., Hafeez, M. and Jackson, T., 2008. The NAFE’06 Data Set: Towards Soil Moisture Retrieval at Intermediate ResolutionAdvances in Water Resources31(11):1444-1455. doi:10.1016/j.advwatres.01.018 Copyright 2008 Elsevier Science Ltd. (pdf 2.4MB)

Parinussa, R. M., de Jeu, R. A. M., Holmes, T. R. H. and Walker, J. P., 2008. Comparison of Microwave and Infrared Land Surface Temperature Products over the NAFE’06 Research SitesGeoscience and Remote Sensing Letters5(4):783-787, doi:10.1109/LGRS.2008.2005738. Copyright 2008 IEEE. (pdf 1.3MB)

Escorihuela, M. J., Saleh, K., Richaume, P., Merlin, O., Walker, J. P. and Kerr, Y. H., 2008. Sunglint Observations over Land From Ground and Airborne L-band Radiometer DataGeophysical Research Letters35(20), L20406, 5pp, doi:10.1029/2008GL035062. Copyright 2008 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 623kB)

Merlin, O., Walker, J. P., Chehbouni, A. and Kerr, Y. H., 2008. Towards Deterministic Downscaling of SMOS Soil Moisture Using MODIS Derived Soil Evaporative EfficiencyRemote Sensing of Environment112(10): 3935-3946. Copyright 2008 Elsevier Science Ltd. (pdf 1.3MB)

Merlin, O., Chehbouni, A., Walker, J. P., Panciera, R. and Kerr, Y. H., 2008. A Simple Method to Dissagregate Passive-Microwave-Based Soil MoistureIEEE Transactions on Geoscience and Remote Sensing46(3): 786-796, doi:10.11.09/TGRS.2007.914807. Copyright 2008 IEEE. (pdf 800kB)

Panciera, R., Walker, J. P., Kalma, J. D., Kim, E. J., Hacker, J., Merlin, O., Berger, M., and Skou, N., 2008. The NAFE’05/CoSMOS Dataset: Towards SMOS Soil Moisture Retrieval, Downscaling and AssimilationIEEE Transactions on Geoscience and Remote Sensing46(3):736-745, doi:10.1109/TGRS.2007.915403. Copyright 2008 IEEE. (pdf 1.3MB)

Turner, M. R. J., Walker, J. P. and Oke, P. R., 2008. Ensemble Member Generation for Sequential Data AssimilationRemote Sensing of Environment112: 1421-1433, doi:10.1016/j.rse.2007.02.042. Copyright 2008 Elsevier Science Ltd. (pdf 899kB)

Pipunic, R., Walker, J. P. and Western, A. W., 2008. Assimilation of Remotely Sensed Data for Improved Latent and Sensible Heat Flux Prediction: A Comparative Synthetic StudyRemote Sensing of Environment112: 1295-1305, doi:10.1016/j.rse.2007.02.038. Copyright 2008 Elsevier Science Ltd. (pdf 683kB)

Teuling, A. J., Uijlenhoet, R., Hurkmans, R., Merlin, O., Panciera, R., Walker, J. P. and Troch, P. A., 2007. Dry-end Surface Soil Moisture Variability during NAFE’06Geophysical Research Letters34, L17402, 5pp, doi:10.1029/207GL031001. Copyright 2007 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 354kB)

Rüdiger, C., Hancock, G. R., Hemakumara, H. M., Jacobs, B., Kalma, J. D., Martinez, C., Thyer, M., Walker, J. P., Wells, T. and Willgoose, G. R., 2007. Goulburn River Experimental Catchment Data SetWater Resources Research43, W10403, 10pp, doi:10.1029/2006WR005837. Copyright 2007 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 766kB)

Dong, J., Walker, J. P., Houser, P. R. and Sun, C., 2007. Scanning Multichannel Microwave Radiometer Snow Water Equivalent AssimilationJournal of Geophysical Research – Atmospheres112, D07108, 16pp, doi:10.1029/2006JD007209. Copyright 2007 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 4.1MB)

Ni-Meister, W., Houser, P. R. and Walker, J. P., 2006. Soil Moisture Initialization for Climate Prediction: Assimilation of Scanning Multifrequency Microwave Radiometer Soil Moisture Data into a Land Surface ModelJournal of Geophysical Research – Atmospheres111(20), D20102, 15pp, doi:10.1029/2006JD007190. Copyright 2006 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 8.7MB)

Ellett, K. M., Walker, J. P., Western, A. W. and Rodell, M., 2006. A Framework for Assessing the Potential of Remote-Sensed Gravity to Provide New Insight on the Hydrology of the Murray-Darling BasinAustralian Journal of Water Resources10(2): 125-138. (pdf 980kB)

Savige, C., French, A. N., Western, A. W., Walker, J. P., Abuzar, M., Hacker, J. M. and Kalma, J. D., 2006. Remote Sensing Estimates of Actual Evapotranspiration in an Irrigation District at a Range of Scales. Australian Journal of Water Resources10(2): 207-212.

Walker, J. P. and Willgoose, G. R., 2006. A Comparative Study of Australian Cartometric and Photogrammetric Digital Elevation Model AccuracyPhotogrammetric Engineering and Remote Sensing72(7): 771-779. (pdf 2.69MB)

Zhan, X., Houser, P. R., Walker, J. P. and Crow, W., 2006. A Method for Retrieving High Resolution Surface Soil Moisture from Hydros L-Band Radiometer and Radar ObservationsIEEE Transactions on Geoscience and Remote Sensing44(6):1534-1544, doi:10.1109/TGRS.2005.863319. Copyright 2006 IEEE (pdf 1.47MB)

Dong, J., Walker, J. P. and Houser, P. R., 2005. Factors Affecting Remotely Sensed Snow Water Equivalent UncertaintyRemote Sensing of Environment97(1): 68-82, doi:10.1016/j.rse.2005.04.010. Copyright 2005 Elsevier Science Ltd. (pdf 1.8MB)

Ni-Meister, W., Walker, J. P. and Houser, P. R., 2005. Soil Moisture Initialization for Climate Prediction: Characterization of Model and Observation ErrorsJournal of Geophysical Research – Atmospheres110, D13111, 14pp, doi:10.1029/2004JD005745. Copyright 2005 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 5.54MB)

Wealands, S. R., Grayson, R. B. and Walker, J. P., 2005. Quantitative Comparison of Spatial Fields for Hydrological Model Assessment – Some Promising ApproachesAdvances in Water Resources28(1): 15-32. Copyright 2004 Elsevier Science Ltd. (pdf 564kB)

Foster, J. L., Sun, C., Walker, J. P., Kelly, R. J., Chang, A. T. C., Dong, J. and Powell, H., 2005. Quantifying the Uncertainty in Passive Microwave Snow Water Equivalent ObservationsRemote Sensing of Environment94(2): 187-203. Copyright 2005 Elsevier Science Ltd. (pdf 1.4MB)

Walker, J. P. and Houser, P. R., 2004. Requirements of a Global Near-Surface Soil Moisture Satellite Mission: Accuracy, Repeat Time, and Spatial ResolutionAdvances in Water Resources27: 785-801. doi:10.1016/j.advwatres.2004.05.006 Copyright 2004 Elsevier Science Ltd. (pdf 1.16MB)

Walker, J. P., Houser, P. R. and Willgoose, G. R., 2004. Active Microwave Remote Sensing for Soil Moisture Measurement: A Field Evaluation Using ERS-2Hydrological Processes18: 1975-1997. doi:10.1002/hyp.1343 (pdf 385kB)

Walker, J. P., Willgoose, G. R. and Kalma, J. D., 2004. In-Situ Measurement of Soil Moisture: A Comparison of TechniquesJournal of Hydrology293: 85-99. doi:10.1016/j.hydrol.20004.10.008 Copyright 2004 Elsevier Science Ltd. (pdf 577kB)

Sun, C., Walker, J. P. and Houser, P. R., 2004. A Methodology for Snow Data Assimilation in a Land Surface ModelJournal of Geophysical Research – Atmospheres109, D08108, doi:10.1029/2003JD003765. Copyright 2004 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 1.19MB)

Rodell, M., Houser, P. R., Jambor, U., Gottschalck, J., Mitchell, K., Meng, C. -J., Arsenault, K., Cosgrove, B., Radakovich, J., Bosilovich, M., Entin, J. K., Walker, J. P., Lohmann D. and Toll, D., 2004. The Global Land Data Assimilation SystemBulletin of the American Meteorological Society85(3): 381-394. Copyright 2004 American Meteorological Society(pdf 2.16MB)

Walker, J. P., Houser, P. R. and Reichle, R. H., 2003. New Technologies Require Advances in Hydrologic Data AssimilationEOS, Transactions American Geophysical Union84(49): 545, 551. Copyright 2003 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 377kB)

Berg, A. A., Famiglietti, J. S., Walker, J. P. and Houser, P. R., 2003. Impact of Bias Correction to Reanalysis Products on Simulations of North American Soil Moisture and Hydrological FluxesJournal of Geophysical Research – Atmospheres108(D16), 4490, doi:10.1029/2002JD003334. Copyright 2003 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 856kB)

Wooldridge, S. A., Kalma, J. D. and Walker, J. P., 2003. Importance of Soil Moisture Measurements for Inferring Parameters in Hydrologic Models of Low-Yielding Ephemeral Catchments. Environmental Modelling and Software18(1): 35-48. Copyright 2003 Elsevier Science Ltd. (pdf 681kB).

Walker, J. P., Willgoose, G. R. and Kalma, J. D., 2002. Three-Dimensional Soil Moisture Profile Retrieval by Assimilation of Near-Surface Measurements: Simplified Kalman Filter Covariance Forecasting and Field ApplicationWater Resources Research38(12), 1301, doi:10.1029/2002WR001545. Copyright 2003 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 1.48MB)

Reichle, R. H., Walker, J. P., Koster, R. D. and Houser, P. R., 2002. Extended vs. Ensemble Kalman Filtering for Land Data AssimilationJournal of Hydrometeorology3(6): 728-740. Copyright 2002 American Meteorological Society. (pdf 278kB)

Walker, J. P. and Houser, P. R., 2002. Evaluation of the OhmMapper Instrument for Soil Moisture MeasurementSoil Science Society of America Journal66(3): 728-734. Copyright 2002 Soil Science Society of America (pdf 139kB)

Walker, J. P., Willgoose, G. R. and Kalma, J. D., 2001. The Nerrigundah Data Set: Soil Moisture Patterns, Soil Characteristics and Hydrological Flux MeasurementsWater Resources Research37(11): 2653-2658. Copyright 2001 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 274kB)

Owe, M., de Jeu, R. and Walker, J. P., 2001. A Methodology for Surface Soil Moisture and Vegetation Optical Depth Retrieval Using the Microwave Polarization Difference IndexIEEE Transactions on Geoscience and Remote Sensing39(8): 1643-1654. Copyright 2001 IEEE. (pdf 240kB)

Walker, J. P. and Houser, P. R., 2001. A Methodology for Initializing Soil Moisture in a Global Climate Model: Assimilation of Near-Surface Soil Moisture ObservationsJournal of Geophysical Research – Atmospheres106(D11): 11761-11774. Copyright 2001 American Geophysical Union. Further reproduction or electronic distribution is not permitted. (pdf 5.36MB)

Walker, J. P., Willgoose, G. R. and Kalma, J. D., 2001. One-Dimensional Soil Moisture Profile Retrieval by Assimilation of Near-Surface Measurements: A Simplified Soil Moisture Model and Field ApplicationJournal of Hydrometeorology2(4): 356-373.Copyright 2001 American Meteorological Society. (pdf 278kB)

Walker, J. P., Willgoose, G. R. and Kalma, J. D., 2001. One-Dimensional Soil Moisture Profile Retrieval by Assimilation of Near-Surface Observations: A Comparison of Retrieval AlgorithmsAdvances in Water Resources24(6): 631-650. Copyright 2001 Elsevier Science Ltd. (pdf 570kB)

Walker, J. P. and Willgoose, G. R., 1999. On the Effect of Digital Elevation Model Accuracy on Hydrology and GeomorphologyWater Resources Research35(7): 2259-2268. Copyright 1999 American Geophysical Union. Further reproduction or electronic distribution is not permitted.(pdf 969kB)

Journal Papers in Review

Azmi, M., Rüdiger, C., Smith, A., Walker, J. P., Comparative Evaluation of Short-term OzFlux Tower Observations and Long-term Landscape Water Balance Data for Weekly Water Stress Monitoring. Frontiers in Earth Science, In Review.

Cotching, W. E., Hills, J. L., Wells, R. B., McLaren, D. K., Gee, C., Walker, J. P., and Ye, N., Within Field Variability of Soil Penetration Resistance, Precision Agriculture, In Review.

Gao, Y., Colliander, A., Burgin, M. S., Walker, J. P., Dinnat, E., Chae, C., Cosh, M. H., Caldwell, T. G., and Berg, A., Multi-Frequency Radiometer-Based Soil Moisture Retrieval and Algorithm Parameterization Using In-situ Sites, IEEE Transactions in Geoscience and Remote Sensing, In Review

Grimaldi, S., Schumann, G. J-P., Shokri, A., Walker, J. P., and Pauwels, V. R. N., Challenges, Opportunities and Pitfalls for Global Coupled Hydrologic/Hydraulic Modelling of Floods, Water Resources Research, In Review

Marchionni, V., Guyot, A., Tapper, N., Walker, J. P., and Daly, E., Tree Water Use Dynamics in Remnant Urban Reserves, Journal of Hydrology, In Review

Senanayake, I. P. , Yeo, I.-Y. , Tangdamrongsub, N., Willgoose,  G. R., Hancock, G. R. , Wells, T., Bin,  F., Lakshmi, V. and Walker, J. P., In-situ Data-based Model to Downscale Radiometric Satellite Soil Moisture Products in the Upper Hunter Region of NSW, Australia, Journal of Hydrology, In Review

Shehab, S., Karmakar, N. and Walker, J. P.,  Substrate Integrated Waveguide (SIW) Power Dividers – A Review, IEEE Antennas and Propagation Magazine, In Review

Tian  S., Renzullo, L. J., van Dijk, A. I. J. M., Tregoning, P., and Walker, J. P., Global Joint Assimilation of GRACE and SMOS for Improved Estimation of Root-zone Soil Moisture and Vegetation Response, Hydrology and Earth System Science, In Review

Tan, X., Huang, J., Wu, M. and Walker, J. P., Effects of Ice Cover on Soil Freezing, Water and Salts Movement: Experiments and Simulations, Journal of Hydrology, In Review

Ye, N., Walker, J. P., Rüdiger, C., Ryu, D., and Gurney, R. J. Impact of Urban Cover Fraction on SMOS and SMAP Surface Soil Moisture Retrieval. Journal of Hydrology, In Review

Ye, N., Walker, J. P., Wu, X., de Jeu, R., Gao, Y., Jackson, T. J., Jonard, F., Kim, E., Merlin, O., Pauwels, V., Renzullo, L. J.,  Rüdiger, C., Sabaghy, S., von Hebel, C., Yueh, S. H., and  Zhu, L.,  The Soil Moisture Active Passive Experiments: Towards Calibration and Validation of the SMAP Mission, Remote Sensing of Environment. In Review

Zhu, L., Walker, J. P., Tsang, L., Huang, H., Ye, N., and Rüdiger, C., Soil Moisture Retrieval from Time Series Multi-Angular Radar Data Using a Dry Down Constraint, Remote Sensing of Environment, In Review

Journal Papers in Preparation

Azmi, M., Rüdiger, C. and Walker, J. P., Spatial Monitoring of Weekly Water Stress in Victoria, Australia, Using the Data Fusion Based Drought Index, Journal of Hydrology, In Preparation

Shahrban, M., Walker, J. P. and Wang, Q. J., Application of Satellite-based Soil Moisture Estimations on Streamflow Prediction in the Murrumbidgee Catchment, Journal of Hydrology, In Preparation

Smith, A. B., Walker, J. P., Western, A. W. and McQueen, H., Detecting a Terrestrial Water Storage Signal in Ground-based Gravity Observations from the Field, Water Resources Research, In Preparation

Wu, X., Walker, J.P., Ye, N., Jonard, F., Monerris-Belda, S., and von Hebel, C., Buggy-based Multi-sensors Platform for Soil Moisture Retrieval. In Preparation

Yee, M-S., Ali, E., Pipunic, R., Beringer, J., Daly, E., McCabe, M. F., Pauwels, V. R. N., Rüdiger, C. and Walker, J. P., Validation of Remote Sensing ET Products Based on a Representative Flux Station, In Preparation

Theses/Reports

Das, N. N., Entekhabi, D., Dunbar, S., Kim, S., Yueh, S., Colliander, A., Jackson, T., J., O’Neill, P. E., Cosh, M., Caldwell, T., Walker, J., Berg, A., Rowlandson, T., Martínez-Fernández, J., González-Zamora, A., Starks, P., Holifield-Collins, C., Prueger, J, and Lopez-Baeza, E., September 15, 2017. Calibration and Validation for the L2_SM_SP Beta Release Data Products, SMAP Project, JPL D-56549, Jet Propulsion Laboratory, Pasadena, CA.

Ye, N., Walker, J. P., Rüdiger, C., Jackson, T., Wu, X., de Jeu, R., Entekhabi, D., Merlin, O., Kim, E. and Renzullo, L., 2015. The Fifth Soil Moisture Active Passive Experiment (SMAPEx-5): Work Plan. Department of Civil Engineering, Monash University. 147pp (pdf 10.5MB)

Ye, N., Walker, J. P., Rüdiger, C., Jackson, T., Wu, X., de Jeu, R., Entekhabi, D., Merlin, O., Kim, E. and Renzullo, L., 2015. The Fourth Soil Moisture Active Passive Experiment (SMAPEx-4): Work Plan. Department of Civil Engineering, Monash University. 159pp (pdf 10.6MB)

Monerris, A., Walker, J. P., Panciera, R., Jackson, T., Tanas, M., Gray, D. and Ryu, D., 2011. The Third Soil Moisture Active Passive Experiment (SMAPEx-3): Work Plan. Department of Civil Engineering, Monash University. 160pp (pdf 14.5MB)

Panciera, R., Walker, J. P., Ryu, D., Gray, D. and Jackson, T., 2010. The Soil Moisture Active Passive Experiment 2 (SMAPEx-2): Experiment Plan. Department of Civil and Environmental Engineering, The University of Melbourne. 133pp (pdf 8.7MB)

Walker, J. P., Rüdiger, C., Peischl, S., Nan, Y., Bandara, R., Allahmoradi, M., Kerr, Y., Kim, E., Gurney, R., Barrett, D. and Le Marshall, J., 2010. Australian Airborne Cal/val Experiments for SMOS (AACES) – Winter Campaign: Experiment Plan. Department of Civil Engineering, Monash University. 171pp (pdf 22.9MB)

Panciera, R., Walker, J. P., Ryu, D., Gray, D. and Jackson, T., 2010. The Soil Moisture Active Passive Experiments (SMAPEx): Experiment Plan. Department of Civil and Environmental Engineering, The University of Melbourne. 134pp (pdf 10.2MB)

Walker, J. P., Rüdiger, C., Peischl, S., Allahmoradi, M., Ryu, D., Kerr, Y., Kim, E., Gurney, R., Barrett, D. and Le Marshall, J., 2010. Australian Airborne Cal/val Experiments for SMOS (AACES): Experiment Plan. Department of Civil and Environmental Engineering, The University of Melbourne. 208pp (pdf 38.6MB)

Saleh, K., Kerr, Y. H., Escorihuela, M. J., Wigneron, J. P., Richaume, P., Boulet, G., Masiongrande, P., Panciera, R., Walker, J. P., Lopez-Baeza, E., Millan-Scheiding, C. and Juglea, S., 2009. Final Report ESA CoSMOS Data Analysis Study 2007-2008 (RFQ-3-11801/06/NL/FF). European Space Agency. 227pp (pdf 9.9MB)

Wealands, S., Stewardson, M., Gilvear, D., Hacker, J., Walker, J. P., Downes, B. and Rutherford, I., 2008. Remote Sensing of Rivers: A Potential Contribution to the Murray-Darling Basin Sustainable Rivers Audit. Department of Civil and Environmental Engineering, The University of Melbourne. 61pp (pdf 347kB)

Young, R., Walker, J., Yeoh, N., Smith, A., Ellett, K., Merlin, O. and Western, A., 2008. Soil Moisture and Meteorological Observations From the Murrumbidgee Catchment, Department of Civil and Environmental Engineering, The University of Melbourne. (pdf 2.69MB)

Yeoh, N., Walker, J., Young, R., Rüdiger, C., Smith, A., Ellett, K., Pipunic, R. and Western, A., 2008. Calibration of the Murrumbidgee Monitoring Network CS616 Soil Moisture Sensors, Department of Civil and Environmental Engineering, The University of Melbourne. (pdf 717kB)

O’Neill, P. M., Dehaan, R., Walker, J. P. and Hue, I., 2008. Improving the Airborne Remote Sensing of Soil Moisture: Estimating Soil Effective Temperature. Charles Sturt University. 29pp (pdf 803kB)

Barrett, D. J., Kuzmin, V. A., Walker, J. P., McVicar, T. R. and Draper, C., 2008. Improving Stream Flow Forecasting by Integrating Satellite Observations, In Situ Data and Catchment Models Using Model-Data Assimilation Methods. eWater Technical Report. eWater Cooperative Research Centre, Canberra. 59pp (pdf 3.3MB) Peer reviewed

Kuzmin, V. A., Seed, A. W. and Walker J. P., 2007. Australian Government Bureau of Meteorology Forecast and Real-time Observational Hydrometeorological Data for Hydrologic Forecasting. eWater Technical Report. eWater Cooperative Research Centre, Canberra. 29pp (pdf 1.9MB) Peer reviewed

Walker, J. P., Olivier, M. and Panciera, R., 2006. National Airborne Field Experiment 2006: Experiment Plan. Department of Civil and Environmental Engineering, The University of Melbourne. 124pp (pdf 7.9MB)

Walker, J. P. and Panciera, R., 2005. National Airborne Field Experiment 2005: Experiment Plan. Department of Civil and Environmental Engineering, The University of Melbourne. 105pp (pdf 12.1MB)

Walker, J. P., 1999. Estimating Soil Moisture Profile Dynamics From Near-Surface Soil Moisture Measurements and Standard Meteorological DataPhD Thesis, Department of Civil, Surveying and Environmental Engineering, The University of Newcastle.

Walker, J. P., 1995. Accuracy of DEMs. Honours Thesis, Department of Civil, Surveying and Environmental Engineering, The University of Newcastle.

Articles and Editorials

Walker, J. P., Kim, E. J., and England, A. W., 2009. Guest Editorial: Introduction to the Special Issue on Airborne Field Campaigns for Soil MoistureIEEE Geoscience and Remote Sensing Letters6(4): 623-624, doi:10.1109/LGRS.2009.2026982. (pdf 90kB)

Walker, J. P., 2002. Soil Moisture Monitoring in the Goulburn River CatchmentMerriwa Landcare Newsletter. (pdf 91kB)

Houser, P. R., Rodell, M., Jambor, U., Gottschalck, J., Cosgrove, B., Radakovich, J., Arsenault, K., Bosilovich, M., Entin, J. K., Walker, J. P., Mitchell, K., Pan, H. L. and Meng, C.-J., 2001. The Global Land Data Assimilation SystemGEWEX News11(2): 11-13. (pdf 2.41MB)

Peer Reviewed Conference Papers

Zhu, L., Walker, J.P., Ye, N., Rudiger, C.,  2016 The Effect of Radar Configuration on Effective Correlation Length, Proceedings of the 2016 18th International Conference on Electromagnetics in Advanced Applications (ICEAA), Institute of Electrical and Electronics Engineers, pp 820-823

Zhang, Y., Li, Y., Walker, J.P., Pauwels, V.R.N. and Shahrban, M., 2015. Towards Operational Hydrological Model Calibration Using Streamflow and Soil Moisture Measurements. In Weber, T., McPhee, M.J. and Anderssen, R.S. (eds) MODSIM2015, 21st International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, November 29 – December 4, 2015, pp.2089-2095. ISBN: 978-0-9872143-5-5 (pdf 1.67MB)

Ouellette, J. D., Johnson, J. T., Balenzano, A., Mattia, F., Satalino, G., Kim, S., Walker, J. P., Panciera, R., 2014. A Study of Soil Moisture Estimation from Multi-Temporal L-band Radar Observations of Vegetated Surfaces, 10th European Conference on Synthetic Aperture Radar (EUSAR14), Berlin, Germany, 3-5 June, 2014.

Alonso-Arroyo, A., Camps, A., Monerris, A., Rudiger, C., Walker, J.P., Forte, G., Pascual, D., Park, H., Onrubia, R., 2014 The Light Airborne Reflectometer for GNSS-R Observations (LARGO) Instrument: Initial Results from Airborne and Rover Fields Campaigns, International Geoscience and Remote Sensing Symposium (IGARSS), IEEE, Institute of Electrical and Electronics Engineers, p4054-4057

Disseldorp, D. A., Yee, M., Monerris, A. and Walker, J. P., 2013. A Temporal Stability Analysis of The Australian SMAP Mission Validation Site. In Piantadosi, J., Anderssen, R.S. and Boland J. (eds) MODSIM2013, 20th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 1-6, 2013, pp.2869-2875. ISBN: 978-0-9872143-3-1. (pdf 1.70MB)

Dumedah, G., Walker, J. P., and Mililli, B., 2013. Examining The Impact of Scale Variations on Soil Moisture Downscaling Using Temporal Persistence. In Piantadosi, J., Anderssen, R.S. and Boland J. (eds) MODSIM2013, 20th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 1-6, 2013, pp.3078-3084. ISBN: 978-0-9872143-3-1. (pdf 1.31MB)

Dumedah, G. and Walker, J. P., 2013. Joint Model State-Parameter Retrieval Through The Evolutionary Data Assimilation Approach. In Piantadosi, J., Anderssen, R.S. and Boland J. (eds) MODSIM2013, 20th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 1-6, 2013, pp.2876-2882. ISBN: 978-0-9872143-3-1. (pdf 1.38MB)

Elhassan, S., Wu, X. and Walker, J. P., 2013. Standing Water Detection Using Radar. In Piantadosi, J., Anderssen, R.S. and Boland J. (eds) MODSIM2013, 20th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 1-6, 2013, pp.3085-3091. ISBN: 978-0-9872143-3-1. (pdf 2.66MB)

Gao, Y., Walker, J. P., Panciera, R., Monerris A. and Ryu, D, 2013. Retrieval of Soil Surface Roughness from Active and Passive Microwave Observations. In Piantadosi, J., Anderssen, R.S. and Boland J. (eds) MODSIM2013, 20th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 1-6, 2013, pp.3092-3098. ISBN: 978-0-9872143-3-1. (pdf 1.33MB)

Moghaddam, N. F., Rüdiger, C., Samsonov, S., Walker, J. P. and Hall, M., 2013. An Assessment of DInSAR Potential for Simulating Geological Subsurface Structure. In Piantadosi, J., Anderssen, R.S. and Boland J. (eds) MODSIM2013, 20th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 1-6, 2013, pp.3099-3105. ISBN: 978-0-9872143-3-1. (pdf 1.53MB)

Wu, X., Walker, J. P., Rüdiger, C., Panciera, R. and Das, N. N., 2013. Downscaling of Coarse-resolution Radiometer Brightness Temperature by High-resolution Radar Backscatter. In Piantadosi, J., Anderssen, R.S. and Boland J. (eds) MODSIM2013, 20th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 1-6, 2013, pp.3127-3133. ISBN: 978-0-9872143-3-1. (pdf 2.96MB)

Yee, M., Walker, J. P., Dumedah, G., Monerris, A. and Rüdiger, C., 2013. Towards Land Surface Model Validation from Using Satellite Retrieval Soil Moisture. In Piantadosi, J., Anderssen, R.S. and Boland J. (eds) MODSIM2013, 20th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 1-6, 2013, pp.2890-2896. ISBN: 978-0-9872143-3-1. (pdf 1.51MB)

Walker, J. P., Dumedah, G., Monerris, A., Gao, Y., Rüdiger, C., Wu, X., Panciera, R., Merlin, O., Pipunic, R., Ryu, D., and Zreda, M., 2012. High Resolution Soil Moisture Mapping5th Global Workshop on Digital Soil Mapping. Sydeny, Australia, 10-13 April, 2012. (pdf 584kB)Invited Keynote

Gao, Y., Walker, J. P., Ryu, D., Panciera, R. and Monerris, A., 2011. Validation of a τ-ω Model with Soil Moisture Active Passive Experiment (SMAPEx) Data Sets in Australia. In Chan, F., Marinova, D. and Anderssen, R. S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 12-16 2011, pp. 1944-1950. (pdf 1.59MB)

Rüdiger, C., Walker, J. P., Kerr, Y. H., Mialon, A., Merlin, O. and Kim, E. J., 2011. Validation of the Level 1c and Level 2 SMOS Products with Airborne and Ground-based Observations. In Chan, F., Marinova, D. and Anderssen, R. S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 12-16 2011, pp. 2002-2008. (pdf 604kB)

Matic, V., Costelloe, J. F., Western, A. W., Walker, J. P. and Tyler, S. W., 2011. Evaluating SEBAL for Estimating Arid Zone Shallow Groundwater Discharge. In Chan, F., Marinova, D. and Anderssen, R. S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 12-16 2011, pp. 1966-1972. (pdf 2.33MB)

Teluguntla, P., Ryu, D., George, B. and Walker, J. P., 2011. Impact of Spatial Scale on Remotely Sensed Evapotranspiration Estimates from Heterogeneous Land Surfaces. In Chan, F., Marinova, D. and Anderssen, R. S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 12-16 2011, pp. 2016-2022. (pdf 2.50MB)

Wu, X., Walker, J. P., Rüdiger, C., Panciera, R., Monerris, A. and Das, N. N., 2011. Towards Medium-resolution Brightness Temperature Retrieval from Active and Passive Microwave. In Chan, F., Marinova, D. and Anderssen, R. S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 12-16 2011, pp. 2023-2029. (pdf 437kB)

Monerris, A., Walker, J. P., Panciera, R., Jackson, T. J., Gray, D., Yardley, H. and Ryu, D., 2011. The Third Soil Moisture Active Passive Experiment. In Chan, F., Marinova, D. and Anderssen, R. S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 12-16 2011, pp. 1980-1986. (pdf 578kB)

Pipunic, R. C., McColl, K. A., Ryu, D. and Walker, J. P., 2011. Can Assimilating Remotely-sensed Surface Soil Moisture Data Improve Root-zone Soil Moisture Predictions in the CABLE Land Surface Model? In Chan, F., Marinova, D. and Anderssen, R. S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 12-16 2011, pp. 1994-2001. (pdf 1.62MB)

McColl, K. A., Pipunic, R. C., Ryu, D. and Walker, J. P., 2011. Validation of the MODIS LAI Product in the Murrumbidgee Catchment, Australia. In Chan, F., Marinova, D. and Anderssen, R. S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 12-16 2011, pp. 1973-1979. (pdf 852kB)

Peischl, S., Ye, N., Walker, J. P., Ryu, D. and Kerr, Y. H., 2011. Soil Moisture Retrieval from Multi-incidence Angle Observations at L-band. In Chan, F., Marinova, D. and Anderssen, R. S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 12-16 2011, pp. 1987-1993. (pdf 1.97MB)

O’Neill, P. M., Dehaan, R. and Walker, J. P., 2011. Diurnal Temperature Profile Impacts on Estimating Effective Soil Temperature at L-band. In Chan, F., Marinova, D. and Anderssen, R. S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 12-16 2011, pp. 3377-3383. (pdf 319kB)

Shahrban, M., Walker, J. P., Wang, Q. J., Seed, A. and Steinle, P., 2011. Comparison of Weather Radar, Numerical Weather Prediction and Gauge-based Rainfall Estimates. In Chan, F., Marinova, D. and Anderssen, R. S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 12-16 2011, pp. 3384-3390. (pdf 596kB)

Smith, A. B., Walker, J. P. and Western, A. W., 2011. Variational Gravity Data Assimilation to Improve Soil Moisture Prediction in a Land Surface Model. In Chan, F., Marinova, D. and Anderssen, R. S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 12-16 2011, pp. 3391-3397. (pdf 194kB)

Ye, N., Walker, J. P., Rüdiger, C., Ryu, D. and Gurney, R. J., 2011. The Effect of Urban Cover Fraction on the Retrieval of Space-borne Surface Soil Moisture at L-band. In Chan, F., Marinova, D. and Anderssen, R. S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 12-16 2011, pp. 3398-3404. (pdf 1.57MB)

Bandara, H. R. S., Walker, J. P., Rüdiger, C., Pipunic, R. C., Dharssi, I. and Gurney, R. J., 2011. Towards Soil Hydraulic Parameter Retrieval from Land Surface Models Using Near-surface Soil Moisture Data. In Chan, F., Marinova, D. and Anderssen, R. S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 12-16 2011, pp. 3342-3348. (pdf 711kB)

Costelloe, J. F., Matic, V., Western, A. W., Walker, J. P. and Tyler, M., 2011. Field Estimates of Groundwater Discharge-Great Artesian Basin, South Australia. In Chan, F., Marinova, D. and Anderssen, R. S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 12-16 2011, pp. 2100-2106. (pdf 1.19MB)

Ershadi, A., McCabe, M. F., Evans, J. P. and Walker, J. P., 2011. Evaluation of Energy Balance, Combination, and Complementary Schemes for Estimation of EvaporationProceedings of IAHS Lead Symposia, IUGG2011, Melbourne, Australia, July 2011. (pdf 461kB)

Chai, S. S., Walker, J. P., Veenendaal, B. and West, G., 2011. An Artificial Neural Network Model for Downscaling of Passive Microwave Soil MoistureThe 6th IASME/WSEAS International conference on Water Resources, Hydraulics & Hydrology, Cambridge, UK, 23-25 February, 2011. (pdf 502kB)

Teluguntla, P., Ryu, D., George, B. and Walker, J. P., 2010. Long-term product of Evapotranspiration Using AVHRR in the Krishna River Basin, India15 ARSPC Australasian Remote Sensing & Photogrammetry Conference, 13-17 September 2010, Alice Springs, Australia. (pdf 813kB)

Chai, S. -S., Veenendaal, B., West, G. and Walker, J. P., 2009. Input Parameters Selection for Soil Moisture Retrieval Using an Artificial Neural Network. In Ostendorf, B., Baldock, P., Bruce, D., Burdett, M., and Corcoran, P., (eds) Surveying & Spatial Sciences Institute Biennial International Conference, Adelaide Sept 2009, pp. 1181-1194. (pdf 242kB)

Summerell, G., Wilford, J., Shoemark, V., Grant, S., and Walker, J. P., 2009. High Resolution Passive Microwave Response to Landscape Controls Influencing Soil Moisture Patterns: A Case Study for the Livingstone Creek Catchment. In Anderssen, R. S., R. D. Braddock and L. T. H. Newham (eds) 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand and International Association for Mathematics and Computers in Simulation, July 2009, pp. 2528-2533. (pdf 656kB)

Azcurra, C. and Walker, J. P., 2009. Towards SMOS Validation in South-eastern Australia. In Anderssen, R. S., R. D. Braddock and L. T. H. Newham (eds) 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand and International Association for Mathematics and Computers in Simulation, July 2009, pp. 3675-3681. (pdf 499kB)

Peischl, S., Walker, J. P., Allahmoradi, M., Barrett, D., Gurney, R., Kerr, Y., Kim, E., LeMarshall, J., Rüdiger, C., Ryu D., and Ye N., 2009. Towards Validation of SMOS Using Airborne and Ground Data Over the Murrumbidgee Catchment. In Anderssen, R. S., R. D. Braddock and L. T. H. Newham (eds) 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand and International Association for Mathematics and Computers in Simulation, July 2009, pp. 3733-3739. (pdf 576kB)

Rüdiger, C., Walker, J. P., Allahmoradi, M., Barrett, D., Costelloe, J., Gurney, R., Hacker, J., Kerr, Y. H., Kim, E., Le Marshall, J., Lieff, W., Marks, A., Peischl, S., Ryu, D., and Ye, N., 2009. Identification of Spaceborne Microwave Radiometer Calibration Sites for Satellite Missions. In Anderssen, R. S., R. D. Braddock and L. T. H. Newham (eds) 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand and International Association for Mathematics and Computers in Simulation, July 2009, pp. 3740-3746. (pdf 875kB)

Ye, N., Walker, J. P., Panciera, R., Ryu, D., Rüdiger, C., and Gurney, R. J., 2009. The Effect of Rock Cover Fraction on the Retrieval of Surface Soil Moisture at L-band. In Anderssen, R. S., R. D. Braddock and L. T. H. Newham (eds) 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand and International Association for Mathematics and Computers in Simulation, July 2009, pp. 3761-3767. (pdf 391kB)

Costelloe, J. F., Matic, V., Western, A. W., and Walker, J. P., 2009. Framework for Incorporating Spectral Observations into Steady State Analysis of Groundwater Discharge Around the Margins of the Great Artesian Basin. In Anderssen, R. S., R. D. Braddock and L. T. H. Newham (eds) 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand and International Association for Mathematics and Computers in Simulation, July 2009, pp. 3690-3696. (pdf 623kB)

Costelloe, J. F., Irvine, E. C., Western, A. W., Matic, V., Walker, J. P. and Tyler, M., 2008. Quantifying Near-surface Diffuse Groundwater Discharge Along the South-west Margin of the Great Artesian BasinProceedings of the Water Down Under 2008 incorporating 31st Hydrology and Water Resources Symposium and 4th International Conference on Water Resources and Environment Research [CD-ROM]. The Institute of Engineers Australia, Adelaide, Australia, 14-17 April, 2008, pp. 831-840. (pdf 484kB)

Walker, J. P., and 62 others, 2007. The National Airborne Field Experiment Data Sets. In Oxley, L. and Kulasiri, D. (eds) MODSIM 2007 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 2007, pp. 2625-2631. ISBN : 978-0-9758400-4-7 (pdf 956kB)

Panciera, R., Walker, J. P., Kim, E., Kalma, J. and Merlin, O., 2007. Effect of Spatial Scale on Soil Moisture Retrieval From Passive Microwave Sensors. In Oxley, L. and Kulasiri, D. (eds) MODSIM 2007 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 2007, pp. 2576-2582. ISBN : 978-0-9758400-4-7 (pdf 1.8MB)

Merlin, O., Walker, J. P., Panciera, R., Young, R., Kalma, J. D. and Kim, E. J., 2007. Calibration of a Soil Moisture Sensor in Heterogeneous Terrain with the National Airborne Field Experiment (NAFE) Data. In Oxley, L. and Kulasiri, D. (eds) MODSIM 2007 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 2007, pp. 2604-2610. ISBN : 978-0-9758400-4-7 (pdf 773kB)

Draper, C. S., Walker, J. P. and Steinle, P. J., 2007. Remotely Sensed Soil Moisture over Australia from AMSR-E. In Oxley, L. and Kulasiri, D. (eds) MODSIM 2007 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 2007, 7pp. ISBN : 978-0-9758400-4-7 (pdf 195kB)

Pipunic, R. C., Walker, J. P., Trudinger, C. and Western, A. W., 2007. Effect of One-Dimensional Field Data Assimilation on Land Surface Model Flux Estimates with Implications for Improved Numerical Weather Prediction. In Oxley, L. and Kulasiri, D. (eds) MODSIM 2007 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 2007, pp. 1736-1742. ISBN : 978-0-9758400-4-7 (pdf 815kB)

Walker, J. P., Merlin, O., Panciera, R. and Kalma, J. D., 2006. National Airborne Field Experiments for Soil Moisture Remote Sensing30th Hydrology and Water Resources Symposium [CD-ROM]. The Institute of Engineers Australia, Launceston, Australia, 4-8 December, 2006. (pdf 592kB)

Panciera, R., Walker, J. P., Merlin, O., Kalma, J. D. and Kim, E. J., 2006. Scaling Properties of L-band Passive Microwave Soil Moisture: From SMOS to Paddock Scale30th Hydrology and Water Resources Symposium [CD-ROM]. The Institute of Engineers Australia, Launceston, Australia, 4-8 December, 2006. (pdf 317kB)

Maggioni, V., Panciera, R., Walker, J. P., Rinaldi, M. and Paruscio, V., 2006. A Multi-Sensor Approach for High Resolution Airborne Soil Moisture Mapping30th Hydrology and Water Resources Symposium [CD-ROM]. The Institute of Engineers Australia, Launceston, Australia, 4-8 December, 2006. (pdf 148kB)

Smith, A. B., Walker, J. P. and Western, A. W., 2006. Detection of a Soil Moisture and Groundwater Signal in Ground-Based Gravity Observations30th Hydrology and Water Resources Symposium [CD-ROM]. The Institute of Engineers Australia, Launceston, Australia, 4-8 December, 2006. (pdf 408kB) Best Paper

Lymburner, L., Hairsine, P. B., Walker, J. P. and Held, A. A., 2006. A Method to Identify Likely Sites for Denitrification in Semi-Arid Floodplain Rivers9th International River Symposium [CD-ROM]. Brisbane, Australia, 4-7 September, 2006. (pdf 116kB)

Walker, J. P., Hacker, J. M., Kalma, J. D., Kim, E. J. and Panciera, R., 2005. National Airborne Field Experiments for Prediction in Ungauged Basins. In A. Zerger and R. M. Argent (Eds), MODSIM 2005 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 2005, 2974-2980. (pdf 832kB)

Savige, C., Western, A., Walker, J. P., Kalma, J. D., French, A. and Abuzar, M., 2005. Obtaining Surface Energy Fluxes from Remotely Sensed Data. In A. Zerger and R. M. Argent (Eds), MODSIM 2005 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 2005, 2946-2952. (pdf 309kB)

Ellett, K., Walker, J. P., Rodell, M., Chen, J. and Western, A., 2005. GRACE Gravity Fields as a New Measure for Assessing Large-scale Hydrological Models. In A. Zerger and R. M. Argent (Eds), MODSIM 2005 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 2005, 2911-2917. (pdf 403kB)

Wealands, S. R., Grayson, R. B. and Walker, J. P., 2005. Utilising Tolerances When Assessing Models Using Spatial Fields. In A. Zerger and R. M. Argent (Eds), MODSIM 2005 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 2005, 2547-2553. (pdf 665kB)

Rüdiger, C., Walker, J. P., Kalma, J. D., Willgoose, G. R. and Houser, P. R., 2005. Root Zone Soil Moisture Retrieval Using Streamflow and Surface Moisture Data Assimilation in Nested Catchments. In A. Zerger and R. M. Argent (Eds), MODSIM 2005 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 2005, 1458-1464. (pdf 488kB)

Nguyen, H. T. and Walker, J. P., 2005. The Effect of Irrigation Schedules on Water Table Depth and Root Zone Soil Moisture. In A. Zerger and R. M. Argent (Eds), MODSIM 2005 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 2005, 1286-1292. (pdf 348kB)

Turner, M., Walker, J. P., Oke, P. and Grayson R. B., 2005. Assimilation of Sea-surface Temperature into a Hydrodynamic Model of Port Phillip Bay, Australia2005 Coasts and Ports Australasian Conference [CD-ROM]. Adelaide, Australia, 21-23 September, 2005. (pdf 400kB)

Ellett, K. M., Walker, J. P., Western, A. W., Grayson, R. B., Smith, A. and Rodell, M., 2005. Can the GRACE Satellite Mission Help in the Murray-Darling Basin?29th Hydrology and Water Resources Symposium [CD-ROM]. The Institute of Engineers Australia, Canberra, Australia, 20-23 February, 2005. (pdf 347kB)

Smith, A. B., Walker, J. P., Western, A. W. and Ellett, K. M., 2005. Using Ground-Based Gravity Measurements to Monitor Changes in Terrestrial Water Storage29th Hydrology and Water Resources Symposium [CD-ROM]. The Institute of Engineers Australia, Canberra, Australia, 20-23 February, 2005. (pdf 290kB)

Savige, C. L., French, A. N., Western, A. W., Walker, J. P., Abuzar, M., Hacker, J. M. and Kalma, J. D., 2005. Remote Sensing Estimates of Actual Evapotranspiration in an Irrigation District29th Hydrology and Water Resources Symposium [CD-ROM]. The Institute of Engineers Australia, Canberra, Australia, 20-23 February, 2005. (pdf 372kB)

Wealands, S. R., Grayson, R. B. and Walker, J. P., 2005. Quantitative Measures for the Local Similarity of Hydrological Spatial Patterns29th Hydrology and Water Resources Symposium [CD-ROM]. The Institute of Engineers Australia, Canberra, Australia, 20-23 February, 2005. (pdf 323kB)

Lymburner, L., Hairsine, P. B., Walker, J. P. and Held, A. A., 2004. Predicting the Recruitment of Large Woody Debris Throughout a Watershed, In: Lowrance, R. (Ed.), Proceedings of Riparian Ecosystems and Buffers: Multi-scale Structure, Function, and Management. American Water Resources Summer Specialty Conference, Olympic Valley, USA, 28-30 June, 2004. (pdf 227kB)

Lymburner, L., Hairsine, P. B., Walker, J. P. and Held, A. A., 2004. Predicting Riparian Zone Functions Using Remote Sensing, In: Lowrance, R. (Ed.), Proceedings of Riparian Ecosystems and Buffers: Multi-scale Structure, Function, and Management. American Water Resources Summer Specialty Conference, Olympic Valley, USA, 28-30 June, 2004. (pdf 219kB)

Wealands, S. R., Grayson, R. B. and Walker, J. P., 2004. Investigating Spatial Pattern Comparison Methods for Distributed Hydrological Model Assessment, In: C. Pahl, S. Schmidt and T. Jakeman(Ed.), Proceedings of iEMSs 2004 International Congress: Complexity and Integrated Resources Management. International Environmental Modelling and Software Society, Osnabrieck, Germany, 14-17 June, 2004, [CD-ROM]. (pdf 150 kB)

Walker, J. P., Ursino, N., Grayson, R. B., and Houser, P. R., 2003. Australian Root Zone Soil Moisture: Assimilation of Remote Sensing Observations, In: D. Post (Ed.), Proceedings of the International Congress on Modelling and Simulation (MODSIM). Modelling and Simulation Society of Australia and New Zealand, Inc., Townsville, Australia, 14-17 July, 2003, 1:380-385. (pdf 649 kB)

Lymburner, L., Hairsine, P. B., Held, A. A., and Walker, J. P., 2003. Indicies for Assessing the Spatial Distribution and Function of Riparian Buffer Zones, In: D. Post (Ed.), Proceedings of the International Congress on Modelling and Simulation (MODSIM). Modelling and Simulation Society of Australia and New Zealand, Inc., Townsville, Australia, 14-17 July, 2003, 1:350-355. (pdf 210 kB)

Rüdiger, C., Davidson, R. E., Hemakumara, M., Walker, J. P., Kalma, J. D., Willgoose, G. R. and Houser, P. R., 2003. Catchment Monitoring for Scaling and Assimilation of Soil Moisture and Streamflow, In: D. Post (Ed.), Proceedings of the International Congress on Modelling and Simulation (MODSIM). Modelling and Simulation Society of Australia and New Zealand, Inc., Townsville, Australia, 14-17 July, 2003, 1:386-391. (pdf 513 kB)

Wealands, S., Grayson, R. B. and Walker, J. P., 2003. Hydrologic Model Assessment from Automated Spatial Pattern Comparison Techniques, In: D. Post (Ed.), Proceedings of the International Congress on Modelling and Simulation (MODSIM). Modelling and Simulation Society of Australia and New Zealand, Inc., Townsville, Australia, 14-17 July, 2003, 1:416-421. (pdf 227 kB)

Walker, J. P. and Houser, P. R., 2002. Soil Moisture Estimation Using Remote Sensing. 27th Hydrology and Water Resources Symposium [CD-ROM]. The Institute of Engineers Australia, Melbourne, Australia, 20 – 23 May, 2002, 8pp. (pdf 186 kB) animation (avi 8.1MB) (Slides)

Walker, J. P., Willgoose, G. R. and Kalma, J. D., 1999. Recent Advances in Profile Soil Moisture Retrieval. In: W. Boughton (Ed.), Proceedings of the Water 99 Joint Congress; 25th Hydrology and Water Resources Symposium; and 2nd International Conference on Water Resources and Environmental Research. The Institute of Engineers Australia, Brisbane, Australia, 6 – 8 July, 1999, 373-378. (pdf 237 kB)

Conference Papers

Alonso-Arroyo, A., Camps, A., Monerris, A., Rüdiger, C., Walker, J. P., Forte, G., Pascual, D., Park, H., Onrubia, R., 2014. The Light Airborne Reflectometer for GNSS-R Observations (LARGO) Instrument: Initial Results From Airborne and Rover Field CampaignsIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Quebec, Canada, 13-18 July, 2014. (pdf 8MB)

Alonso-Arroyo, A., Camps, A., Monerris, A., Rüdiger, C., Walker, J. P., Forte, G., Pascual, D., Park, H., Onrubia, R., 2014. The Dual Polarization GNSS-R Interference Pattern TechniqueIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Quebec, Canada, 13-18 July, 2014. (pdf 427kB)

Fieber, K., Davenport, I., Tanase, M., Ferryman, J. M., Gurney, R., Walker, J. P., Hacker, J., 2013. Waveform and Discrete LiDAR Effective LAI Estimates: Sensitivity AnalysisSilviLaser Conference, Beijing, China, 9-11 October, 2013. (pdf 881 kB)

Materns, B., Lievens, H., Walker, J. P., Panciera, R., Tanase, M., Monerris, A., Gao, Y., Wu, X., and Verhoest, N. E. C., 2013. An Alternative Roughness Parameterization for Soil Moisture Retrievals from Passive Microwave ObservationsESA Living Planet Symposium, Edinburgh, 9-13 September, 2013. (pdf 143kB)

Panciera, R., Tanase, M., Lowell, K. and Walker, J. P., 2013. Multi-temporal soil Moisture Retrieval Using Synthetic Aperture Radar (SAR)ESA Living Planet Symposium, Edinburgh, 9-13 September, 2013. (pdf 77kB)

Dumedah, G., Walker, J. P. and Rüdiger, C., 2013. Do SMOS Brightness Temperatures Approximate to the Reported 15km Discrete Global Grid? IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Melbourne, Australia, 21-26 July, 2013. (pdf 92kB)Invited

Dumedah, G. and Walker, J. P., 2013. Re-thinking Sensitivity of Model Parameter Values in Soil Moisture Assimilation using The Evolutionary Data AssimilationIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Melbourne, Australia, 21-26 July, 2013. (pdf 133kB)

Fieber,K., Davenport, I., Tanase, M., Ferryman, J. M., Gurney, R. J., Walker, J. P. and Hacker, J. M., 2013. Preliminary Leaf Area Index Estimates from Airborne Small Footprint Full-waveform LIDAR DataIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Melbourne, Australia, 21-26 July, 2013. (pdf 187kB)

Gao, Y., Walker, J. P., Ryu, D. and Monerris, A., 2013. Intercomparison of Surface Roughness Parameterizations for Soil Moisture RetrievalIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Melbourne, Australia, 21-26 July, 2013. (pdf 561kB)

Lievens, H., Al Bitar, A.,De Lannoy, G., Dumedah, G., Hendricks-Franssen, H., Kerr, Y., Tomer, S., Merlin, O., Pan, M., Roundy, J., Sahoo, A., van den Berg, M., Vereecken, H., Verhoest, N., Walker, J. P., Wood, E. and Pauwels, V., 2013. Assimilation of SMOS Data for Improving Surface Water ManagementIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Melbourne, Australia, 21-26 July, 2013. (pdf 95kB)Invited

Lievens, H., Pauwels, V., Al Bitar, A., Cabot, F., De Lannoy, G., Dumedah, G., Kerr, Y.,Pan, M., Walker, J. P., Wood, E. and Verhoest, N., 2013. Simulation of SMOS Brightness Temperatures over the Upper Mississippi (USA) and Murray Darling (Australia) BasinsIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Melbourne, Australia, 21-26 July, 2013. (pdf 93kB)Invited

Monerris, A., Rüdiger, C., Wigneron, J., Walker, J. P. and Gao, Y., 2013. High Resolution Soil Moisture Estimates over The Murrumbidgee Catchment Using Airborne AACES DataIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Melbourne, Australia, 21-26 July, 2013. (pdf 1.73MB)

Panciera, R., MacGill, F., Tanase, M., Lowell, K. and Walker, J. P., 2013. Sensitivity of TerraSAR X-band Data to Surface Parameters in Bare Agricultural AreasIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Melbourne, Australia, 21-26 July, 2013. (pdf 502kB)

Peischl, S., Ye, N., Walker, J. P., Ryu, D. and Kerr, Y., 2013. Assessing the Angular Density of Passive Microwave L-band DataIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Melbourne, Australia, 21-26 July, 2013. (pdf 109kB)

Rüdiger, C., Albergel, C., Dharssi, I., Dumedah, G., Kerr, Y., Merlin, O., Renzullo, L. and Walker, J. P., 2013. Applications of SMOS Data in AustraliaIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Melbourne, Australia, 21-26 July, 2013. (pdf 374kB)Invited

Satalino, G., Mattia, F., Balenzano, A., Panciera, R. and Walker, J. P., 2013. Soil Moisture Maps from Time Series of PALSAR-1 ScanSAR Data over AustraliaIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Melbourne, Australia, 21-26 July, 2013. (pdf 1MB)

Tanase, M., Panciera, R., Lowell, K., Hacker, J. M. and Walker, J. P., 2013. Estimation of Forest Biomass from L-band Polarimetric Decomposition ComponentsIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Melbourne, Australia, 21-26 July, 2013. (pdf 292kB)

Vittucci, C, Guerriero, L., Ferrazzoli, P., Rahmoune, R., Tanase, M., Panciera, R., Monerris, A., Rüdiger, C. and Walker, J. P., 2013. Airborne Forest Monitoring during the SMAPEx-3 CampaignIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Melbourne, Australia, 21-26 July, 2013. (pdf 422kB)

Walker, J. P., Kim, E., Hacker, J. M., Goodberlet, M., Panciera and Rüdiger, C., 2013. The Polarimetric L-band Multi-beam RadiometerIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Melbourne, Australia, 21-26 July, 2013. (pdf 912kB)Invited

Wu, X., Walker, J. P., Das, N., Panciera, R. and Rüdiger, C., 2013. Towards A Medium Resolution Brightness Temperature Product from Active and Passive Microwave ObservationsIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Melbourne, Australia, 21-26 July, 2013. (pdf 321kB)Invited

Tanase, M. A., Panciera, R., Lowell, K., Garcia-Martin, A., and Walker, J. P., 2012. L-band SAR Backscatter Sensitivity to Forest Structure in Semi-arid Environments: Biomass Retrieval Error Analysis at Plot LevelForestSAT 2012, Oregon, USA, 11-14 September, 2012.

Walker, J. P., O’Neill, P., Wu, X., Gao, Y., Monerris, A., Panciera, R., Jackson, T., Gray, D. and Ryu, D., 2012. An Airborne Simulation of The SMAP Data StreamIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Munich, Germany, 22-27 July, 2012. (pdf 378kB)Invited

Rüdiger, C., Walker, J. P., Kerr, Y. H., Mialon, A., Merlin, O. and Kim, E. J., 2012. SMOS L1C and L2 Validation in AustraliaIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Munich, Germany, 22-27 July, 2012. (pdf 517kB)Invited

Pauwels, V. R. N., Lievens, H., Verhoest, N. E. C., De Lannoy, G., Plaza Guingla, D. A., van den Berg, M. J., Kerr, Y., Al Bitar, A., Merlin, O., Cabot, F., Gascoin, S., Wood, E., Pan, M., Sahoo, A., Walker, J., Dumedah, G. and Drusch, M., 2012. On The Assimilation of Multi-angular SMOS Data into A Coupled Land Surface and Radiative Transfer Model for Improving Surface Water ManagementIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Munich, Germany, 22-27 July, 2012. (pdf 108kB)

Bandara, H. R. S., Walker, J. P., Rüdiger, C. and Gurney, R., 2012. Towards Soil Hydraulic Parameter Retrieval from A Land Surface Model under Different Meteorological ConditionsIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Munich, Germany, 22-27 July, 2012. (pdf 88kB)

Ye, N., Walker, J. P. and Rüdiger, C., 2012. A Cumulative Distribution Function Based (CDF-based) Method for Normalizing Multi-beam Microwave ObservationsIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Munich, Germany, 22-27 July, 2012. (pdf 543kB)

Peischl, S., Walker, J. P., Rüdiger, C., Ryu, D. and Kerr, Y., 2012. SMOS Multi-incidence Angle Observations over AustraliaIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Munich, Germany, 22-27 July, 2012. (pdf 562kB)

Satalino, G., Mattia, F., Balenzano, A., Panciera, R. and Walker, J. P., 2012. COSMO-SkyMed SAR Multi-temporal Data for Landcover Classification and Soil Moisture Retrieval over Agricultural Sites in Southern AustraliaIEEE International Geoscience and Remote Sensing Symposium (IGARSS), Munich, Germany, 22-27 July, 2012. (pdf 343kB)

Gray, D., Yardley, H., Yang, R., Walker, J. P., Bates, B., Panciera, R., Hacker, J., McGrath, A. and Goh, A., 2011. PLIS: An Airborne Polarimetric L-band Interferometric Synthetic Aperture RadarAsia-Pacific International Conference on Synthetic Aperture Radar APSAR 2011, Seoul, Korea, 26-30, September, 2011. (pdf 328kB)

Rüdiger, C., Walker, J. P., Kerr, Y. H., Merlin, O. and Mialon, A., 2011. Validation of SMOS L1C and L2 Products with Airborne and In-situ Observations across South-eastern Australia2011 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Vancouver, Canada, 24-29 July, 2011. (pdf 416kB)

Rüdiger, C., Walker, J. P. and Kerr, Y. H., 2011. Validation of Microwave Remote Sensing Products over Australia34th International Symposium on Remote Sensing of Environment, Sydney, Australia, 10-15 April, 2011. (pdf 824kB)

Ershadi, A., McCabe, M. F., Evans, J. P., Walker, J. P. and Pipunic, R., 2011. Estimation of Evaporation Using the Surface Energy Balance System (SEBS) and Numerical Models34th International Symposium on Remote Sensing of Environment, Sydney, Australia, 10-15 April, 2011. (pdf 674kB)

Jackson, T., Cosh, M., Crow, W., Colliander, A. and Walker, J. P., 2011. In-Situ Validation of the Soil Moisture Active Passive (SMAP) Satellite Mission34th International Symposium on Remote Sensing of Environment, Sydney, Australia, 10-15 April, 2011. (pdf 105kB)

Merlin, O., Rüdiger, C., Richaume, P., Al Bitar, A., Mialon, A., Walker, J. P. and Kerr, Y., 2010. Disaggregation as a Top-down Approach for Evaluating 40 km Resolution SMOS Data Using Point-scale Measurements: Application to AACES-1, In: C. M.U.Neale and A. Maltese (Eds), Proceedings of SPIE: Remote Sensing for Agriculture, Ecosystems, and Hydrology XII (Volume 7824), Toulouse, France, 20-23 September, 2010. (pdf 840kB)

Peischl, S., Walker, J. P., Ryu, D., Kerr, Y. and Rüdiger, C., 2010. Towards Multi-incidence Angle Passive Microwave Retrieval of Soil Moisture30th IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Honolulu, 25-30 July, 2010.

Walker, J. P., Panciera, R., Ryu, D., Gray, D. and Jackson, T. J., 2010. SMAPEx: Soil Moisture Active Passive Remote Sensing Experiment for SMAP Algorithm Development30th IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Honolulu, 25-30 July, 2010. Invited

Jackson, T. J., Cosh, M., Bindlish, R., Crow, W., Colliander, A., Njoku, E., McDonald, K., Kimball, J. S., Belair, S., Walker, J. P., Panciera, R., Entekhabi, D., O’Nell, P., 2010. Soil Moisture Active Passive (SMAP) Calibration and Validation Plan and Current Activities30th IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Honolulu, 25-30 July, 2010.

McColl, K. A., Ryu, D., Matic, V. and Walker, J. P., 2010. Salinity Effects on L-band Microwave Remote Sensing of Soil Moisture30th IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Honolulu, 25-30 July, 2010.

Walker, J. P., Peischl, S., Allahmoradi, M., Rüdiger, C., Ryu, D., Ye, N., Barett, D., Gurney, R., Kerr, Y., Kim, E. and Le Marshall, J., 2010. Validation of SMOS: Some First Results30th IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Honolulu, 25-30 July, 2010. Invited

Walker, J. P., Rüdiger, C., Kerr, Y. H., Kim, E. J., Gurney, R., Barrett, D. and Le Marshall, J., 2010. A Calibration Site in the Australian Desert for SMOS30th IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Honolulu, 25-30 July, 2010.

Calvet, J. -C., Albergel, C., Zakharova, E., Fritz, N., Szczypta, C., Barbu, A., Lafont, S., Mahfouf, J. -F., Wigneron, J. -P., Novello, N., Kerr, Y., Mialon, A., Zribi, M., Pardé, M., Walker, J. P., Rüdiger, C., 2010. Verification and Assimilation of the SMOS DataProceedings of the ESA Living Planet Symposium, Bergen, Norway, 28 June-2 July, 2010.

Rahmoune, R., Ferrazzoli, P., Walker J. P. and Grant, J. P., 2010. L-band Emission from a Eucalyptus Forest in Various Soil Conditions During the NAFE CampaignProceedings of the 11th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment, Washington, DC, United States, 1-4 Mar, 2010. (pdf 396kB)

Matic, V., Costelloe, J. F., Western A., and Walker J. P., 2008. Characterising the Spectral Signal of Discharge Zones at the Margin of the Great Artesian BasinProceedings of the 14th Australasin Remote Sensing and Photogrammetry Conference, Darwin, Australia, 30 Sept – 2 Oct, 2008. (pdf 225kB)

Walker J. P., Panciera, R., and Kim, E., 2008. High Resolution Airborne Soil Moisture MappingProceedings of the 14th Australasin Remote Sensing and Photogrammetry Conference, Darwin, Australia, 30 Sept – 2 Oct, 2008. (pdf 195kB)

Chai, S. -S., Veenendaal, B., West, G., and Walker J. P., 2008. Backpropagation Neural Network for Soil Moisture Retrieval Using NAFE’05 Data: A Comparison of Training AlgorithmsProceedings of the International Society for Photogrammetry and Remote Sensing (ISPRS) XXIth Congress (Volume XXXVII, Part B4), Beijing, China, 3-11 July, 2008. (pdf 718kB)

Walker J. P., Panciera, R., and Kim E., 2008. High Resolution Airborne Soil Moisture MappingInternational Geoscience and Remote Sensing Symposium (IGARSS), Boston, USA, 7-11 July, 2008. (pdf 247kB)

Panciera, R., Walker J. P., Kim E., and Kalma, J., 2008. Application of a Bayesian Approach for Downscaling of SMOS ObservationsInternational Geoscience and Remote Sensing Symposium (IGARSS), Boston, USA, 7-11 July, 2008. (pdf 271kB)

Grant, J. P., Wigneron, J. -P., Panciera, R., Saleh, K., Walker J. P., and Van de Griend, A. A., 2008. Influence of Forest Cover on L-band Soil Moisture Retrieval from Heterogeneous PixelsInternational Geoscience and Remote Sensing Symposium (IGARSS), Boston, USA, 7-11 July, 2008. (pdf 102kB)

Chai, S. -S., Veenendaal, B., West, G., Walker J. P., and Metternicht, G., 2008. Explicit Inverse of Soil Moisture Retrieval with Artificial Neural Network Using Passive Microwave Remote SensingInternational Geoscience and Remote Sensing Symposium (IGARSS), Boston, USA, 7-11 July, 2008. (pdf 177kB)

Chai, S. -S., Veenendaal, B., West, G., Walker J. P., and Metternicht, G., 2008. Input Pattern According to Standard Deviation of Backpropogation Neural Network: Influence on the Accuracy for Soil Moisture RetrievalInternational Geoscience and Remote Sensing Symposium (IGARSS), Boston, USA, 7-11 July, 2008. (pdf 232kB)

Saleh, K., Boulet, G., Kerr, Y. H., Massiongrande, P., Richaume, P., Wigneron, J., -P., Delwart, S., Panciera, R., and Walker J. P., 2008. Validation of the SMOS Level 2 Retrieval Algorithm Over Crops and Prairies From the CoSMOS-NAFE CampaignInternational Geoscience and Remote Sensing Symposium (IGARSS), Boston, USA, 7-11 July, 2008. (pdf 76kB)

Mladenova, I., Lakshmi, V., Jackson, T., and Walker J. P., 2008. Ku-Band Sensitivity to Soil Moisture: An Evaluation Study for Monitoring Temporal Soil Moisture Change Detection Over the NAFE’06 Study AreaInternational Geoscience and Remote Sensing Symposium (IGARSS), Boston, USA, 7-11 July, 2008. (pdf 109kB)

Draper, C., Walker, J. P. and Steinle, P., 2008. An Evaluation of AMSR-E Soil Moisture Retrievals Over Australia, In: J. Walker, R. Pipunic, and C. Draper (Eds.), Proceedings of the 3rd International Workshop on Catchment-scale Hydrologic Modeling and Data Assimilation. Melbourne, Australia, 9-11 January, 2008. (pdf 1.4MB)

Merlin, O., Walker, J. P. and Teuling, R., 2008. Measurement Accuracy Versus Observation Scale In A Multi-Resolution Data Assimilation Framework, In: J. Walker, R. Pipunic, and C. Draper (Eds.), Proceedings of the 3rd International Workshop on Catchment-scale Hydrologic Modeling and Data Assimilation. Melbourne, Australia, 9-11 January, 2008. (pdf 815kB)

Panciera, R., Walker, J. P., Kim, E., Kalma, J., and Merlin, O., 2008. Multi-resolution Soil Moisture Retrieval from Passive Microwave Sensors: A Preliminary Study, In: J. Walker, R. Pipunic, and C. Draper (Eds.), Proceedings of the 3rd International Workshop on Catchment-scale Hydrologic Modeling and Data Assimilation. Melbourne, Australia, 9-11 January, 2008. (pdf 822kB)

Kuzmin, V., and Walker, J. P., 2008. The Stochastic Filter for Asymmetrically Distributed Streamflow, In: J. Walker, R. Pipunic, and C. Draper (Eds.), Proceedings of the 3rd International Workshop on Catchment-scale Hydrologic Modeling and Data Assimilation. Melbourne, Australia, 9-11 January, 2008. (pdf 393kB)

Pipunic, R., Walker, J. P. and Western, A., 2008. One-Dimensional Field Data Assimilation into a Land Surface Model for Improved Heat Flux Estimates, In: J. Walker, R. Pipunic, and C. Draper (Eds.), Proceedings of the 3rd International Workshop on Catchment-scale Hydrologic Modeling and Data Assimilation. Melbourne, Australia, 9-11 January, 2008. (pdf 1.1MB)

Boulet, G., Walker, J. P., Maisongrande, P., Saleh, K., Rüdiger, C., Gruhier, C., de Rosnay, P., Panciera, R., Merlin, O., Kalma, J. and Kerr, Y., 2008. Exploitation of the NAFE’05 Campaign for Cal/Val Activities of the SMOS Mission. In: J. Walker, R. Pipunic, and C. Draper (Eds.), Proceedings of the 3rd International Workshop on Catchment-scale Hydrologic Modeling and Data Assimilation. Melbourne, Australia, 9-11 January, 2008. (pdf 659kB)

Walker, J. P., Barrett, D., Gurney, R., Kalma, J., Kerr, Y., Kim, E., and LeMarshall, J., 2007. MoistureMap: A Soil Moisture Monitoring, Prediction and Reporting System for Sustainable Land and Water ManagementProceedings of the First CAWCR Workshop: Physical Processes and Modelling of the Water and Carbon Cycle, BMRC Research Report No. 133, pg. 9-12. Melbourne, Australia, 27-29 November, 2007. (pdf 67kB)Invited

Draper, C. S., Walker, J. P., and Steinle, P. J., 2007. An Evaluation of Remotely Sensed Soil Moisture Over AustraliaProceedings of the First CAWCR Workshop: Physical Processes and Modelling of the Water and Carbon Cycle, BMRC Research Report No. 133, pg. 5-8. Melbourne, Australia, 27-29 November, 2007. (pdf 91kB) Invited

Saleh, K., Floricioiu D., Kerr Y. H., Boulet G., Maisongrande P., de Rosnay P., Wigneron J. -P., Cano A., López-Baeza E., Grant J., Balling J., Skou N., Berger M., Delwart S., Wursteisen P. and Walker J. P., 2007. The CoSMOS L-band Experiment in Southeast AustraliaInternational Geoscience and Remote Sensing Symposium (IGARSS), Barcelona, Spain, 23-27 July, 2007. (pdf 356kB)

Stewardson, M., Walker, J. P., Kan, M., Kitchen, L., Hacker, J., Ghadirian, P. and Scholz, G., 2007. Using Airborne Scanners to Map Pools in Rivers5th Australian Stream Management Conference [CD-ROM]. Charles Sturt University Institute for Land, Water and Society, Albury, Australia, 22-25 May, 2007. (pdf 3.6MB)

Kim, E. J., Walker, J. P., Panciera, R. and Kalma, J. D., 2006. The Australian National Airborne Field Experiment 2005: Soil Moisture Remote Sensing at 60 Meter Resolution and Up. International Geoscience and Remote Sensing Symposium (IGARSS), Denver, United States, 31 July – 4 August, 2006.

Walker, J. P., 2005. Land Surface Model Data Assimilation for Atmospheric PredictionProceedings of the Hydrometeorological Applications of Weather and Climate Modelling Workshop, BMRC Research Report No. 111, pp. 111-114. Melbourne, Australia, 3-6 October, 2005. (pdf 284kB)Invited

Smith, A. B., Walker, J. P. and Western, A. W., 2004. Assimilation of Gravity Data into a Soil Moisture and Groundwater Column ModelProceedings of the 2nd International Workshop on Catchment-scale Hydrologic Modeling and Data Assimilation. Princeton, USA, 25-27 October, 2004. (pdf 22kB)

Ellett, K. M., Walker, J. P., Western, A. W., Grayson, R. B. and Rodell, M., 2004. Assimilation of GRACE-type Observations to Improve Catchment-scale Hydrological Model Prediction in the Murray-Darling BasinProceedings of the 2nd International Workshop on Catchment-scale Hydrologic Modeling and Data Assimilation. Princeton, USA, 25-27 October, 2004. (pdf 6kB) (poster)

Rüdiger, C., Walker, J. P., Kalma, J. D., Willgoose, G. R. and Houser, P. R., 2004. Streamflow Data Assimilation: A study on Nested CatchmentsProceedings of the 2nd International Workshop on Catchment-scale Hydrologic Modeling and Data Assimilation. Princeton, USA, 25-27 October, 2004. (pdf 124kB) (poster)

Pipunic, R., Walker, J. P., Western, A. W. and Savige, C., 2004. Assimilation of Latent and Sensible Heat Flux Data into a Land Surface ModelProceedings of the 2nd International Workshop on Catchment-scale Hydrologic Modeling and Data Assimilation. Princeton, USA, 25-27 October, 2004. (pdf 2.3MB) (poster)

Hemakumara, M., Kalma, J. D., Walker, J. P. and Willgoose, G. R., 2004. Downscaling of Low Resolution Passive Microwave Soil Moisture ObservationsProceedings of the 2nd International Workshop on Catchment-scale Hydrologic Modeling and Data Assimilation. Princeton, USA, 25-27 October, 2004. (pdf 190kB) (poster)

Wealands, S. R., Grayson, R. B., Walker, J. P. and Bloschl, G., 2004. Quantitative Measures for the Local Similarity of Hydrological Spatial PatternsProceedings of the 2nd International Workshop on Catchment-scale Hydrologic Modeling and Data Assimilation. Princeton, USA, 25-27 October, 2004. (pdf 744kB) (poster)

Jacobs, B., Kalma, J. D., Hancock G., Hemakumara, M., Walker, J. P. and Willgoose, G. R., 2004. Towards Understanding the Spatial and Temporal Distribution and Dynamics of Soil Organic Carbon Within a Large Temperate Agricultural CatchmentProceedings of the 2nd International Workshop on Catchment-scale Hydrologic Modeling and Data Assimilation. Princeton, USA, 25-27 October, 2004. (pdf 72kB)(poster)

Ni-Meister, W., Walker, J. P., Houser, P. R. and Reichle, R. H., 2004. Soil Moisture Initialization for Climate Prediction: Assimilating SMMR into a Land Surface ModelProceedings of the 2nd International Workshop on Catchment-scale Hydrologic Modeling and Data Assimilation.Princeton, USA, 25-27 October, 2004. (pdf 6kB)

Foster, J., Sun, C., Walker, J. P., Kelly, R., Dong, J. and Chang, A., 2004. Mapping Random and Systematic Errors of Satellite-derived Snow Water Equivalent Observations in EurasiaProceedings of the International Society for Optical Engineering (SPIE) XXth Congress (Volume 4468), Las Palmas, Spain, September, 2004. (pdf 217kB)

Foster, J., Sun, C., Walker, J. P., Kelly, R., Dong, J. and Chang, A., 2004. Identifying and Mapping Systematic Errors in Passive Microwave Snow Water Equivalent ObservationsProceedings of the International Society for Photogrammetry and Remote Sensing (ISPRS) XXth Congress (Volume XXXV, Part B), Istanbul, Turkey, July, 2004. (pdf 1.3MB)

Ni-Meister, W., Walker, J. P. and Houser, P. R., 2004. Soil Moisture Initialization for Climate Prediction: Characterization of Model and Observation ErrorsProceedings of the 18th Conference on Hydrology. The American Meteorological Society, Seattle, USA, 12-15 January, 2004. (pdf 376kB)

Zhan, X., Houser, P. R. and Walker, J. P., 2004. Retrieving Surface Soil Moisture from Simulated HYDROS L-band Radiometer and Radar Observations Using Kalman Filter Data Assimilation, Proceedings of the 18th Conference on Hydrology. The American Meteorological Society, Seattle, USA, 12-15 January, 2004. (Slides)

Reichle, R. H., Koster, R. D., Walker, J. P., Reinecker, M. M. and Houser, P. R., 2002. Aspects of the Extended and Ensemble Kalman Filters for Land Data Assimilation in the NASA Seasonal-to-Interannual Prediction Project, In: R. Atlas and E. Kalney (Ed.), Proceedings of the Symposium on Observations, Data Assimilation, and Probabilistic Prediction. The American Meteorological Society, Orlando, USA, 13 – 17 January, 2002, 111-112. (pdf 90kB)

Sun, C., Walker, J. P. and Houser, P. R., 2002. Snow Assimilation in a Catchment-based Land Surface Model Using the Extended Kalman Filter, In: R. Atlas and E. Kalney (Ed.), Proceedings of the Symposium on Observations, Data Assimilation, and Probabilistic Prediction. The American Meteorological Society, Orlando, USA, 13 – 17 January, 2002, 89-91. (pdf 58kB) (Poster)

Entin, J. K., Houser, P. R., Walker, J. P. and Burke, E., 2002. Improving Land Surface Modeling with Data Assimilation of TRMM Data, Symposium on Observations, Data Assimilation, and Probabilistic Prediction. The American Meteorological Society, Orlando, USA, 13 – 17 January, 2002.

Walker, J. P. and Houser, P. R., 2001. Temporal and Spatial Resolution Requirements for a Soil Moisture MissionInternational Geoscience and Remote Sensing Symposium (IGARSS) [CD-ROM], Sydney, Australia, 9 – 13 July, 2001, 6-8. (pdf 487kB) (SlidesInvited

Walker, J. P. and Houser, P. R., 2001. A Synthetic Study on the Influence of Error in Surface Soil Moisture Observations on Assimilation, In: A. E. MacDonald, T. Schlatter, J. Cunning and R. Ware (Ed.), Proceedings of the 5th Symposium on Integrated Observing Systems. The American Meteorological Society, Albuquerque, USA, 14 – 18 January, 2001, 135-138. (pdf 308kB) (Slides)

Berg, A. A., Famiglietti, J. S., Walker, J. P. and Houser, P. R., 2001. Development of a Catchment-Based Hydrometeorological Forcing Data Set for Land Surface Modeling Applications, In: D. R. Easterling, R. Dishel, D. J. Gafffen, J. S. Gaffney, T. R. Karl, G. L. Johnson, R. Pulwarty, A. Roback, C. F. Ropelewski and A. Warnick (Ed.), Proceedings of the 12th Symposium on Global Change and Climate Variations, The American Meteorological Society, Albuquerque, USA, 14 – 18 January, 2001, 197-198. (pdf 38kB) (Poster)

Walker, J. P., Troch, P. A., Mansini, M., Willgoose, G. R. and Kalma, J. D., 1997. Profile Soil Moisture Estimation Using the Modified IEM. In: T. Stein (Ed.), Proceedings International Geoscience and Remote Sensing Symposium (IGARSS), Singapore, 3 – 8 August, 1997, 1263-1265. (pdf 68kB)

Conference Abstracts

Sabaghy, S., Walker, J. P., Renzullo, L., and Ye., N. A New Optical/Radiometer-based Downscaling Technique for L-band Radiometer Resolution Enhancement. MODSIM2017, 22nd International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, 3-8 December 2017.

Wu, X., Walker, J. P., Ye, N., Jonard, F., and Monerris-Belda, A. Buggy-based Soil Moisture Retrieval System. MODSIM2017, 22nd International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, 3-8 December 2017.

Ye, N., Walker, J. P., Rüdiger, C., Wu, X., Jackson, T., Entekhabi, D., DeJeu, R., Merlin, O., Kim, E. and Renzullo, L., 2015. The Fourth SMAP Experiment (SMAPEx-4): Preliminary Results. MODSIM2015, 21st International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December, 2015.

Wu, X., Walker, J. P. and Ye, N., 2015. Evaluation of a Soil Moisture Downscaling Algorithm Using the SMAPEx Data Set in Australia. MODSIM2015, 21st International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December, 2015.

Wright, A., Li, Y., Grimaldi, S., Pauwels, V. R. N. and Walker, J. P., 2015. A Holistic Approach to Rainfall Estimation for Operational Water Management. MODSIM2015, 21st International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December, 2015.

Grimaldi, S., Li, Y., Wright, A., Pauwels, V. R. N. and Walker, J. P., 2015. Use of Remote Sensing Data to Improve Hydraulic Model for Real Time Flood Wave Routing Prediction. MODSIM2015, 21st International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December, 2015.

Li, Y., Pauwels, V. R. N., Walker, J. P., Grimaldi, S. and Wright, A., 2015. Evaluation of Hydrological Models for Using Soil Moisture Observations. MODSIM2015, 21st International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December, 2015.

Tian, S., Tregoning, P., Renzullo, L. J., van Dijk, A. I. J. M. and Walker, J. P. , 2015. Integrating GRACE and SMOS Data into a Hydrological Model Using an Ensemble Kalman Filter. MODSIM2015, 21st International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December, 2015.

Fieber, K. D., Davenport, I. J., Tanase, M. A., Ferryman, J. M., Gurney, R. J., Walker, J. P., Hacker, J. M., 2014. Sensitivity of LAIe and CHP Retrieved from Airborne Full-waveform LiDAR Data to Incidence Angle in Discontinuous Forest Canopy. ForestSAT, Italy, 4-7 November, 2014.

Lievens, H., Van Den Berg, J., Martens, B., Verhoest, N., Al-Bitar, A., Merlin, O., Tomer, S., Cabot, F., Kerr, Y., Pan, M., Wood, E., Drusch, M., Hendricks Franssen, H., Vereecken, H., De Lannoy, G., Dumedah, G., Walker, J. P., 2014. A Multiscale Data Assimilation Algorithm for SMOSComputational Methods in Water Resources, XX, INTERNATIONAL CONFERENCE, Stuttgart, Germany, 10-13 June, 2014.

Vittucci, C., Guerriero, L., Ferrazzoli, P., Rahmoune, R., Tanase, M., Pancera, R., Monerris, A., Rudiger, C., Gao, Y., and Walker, J., 2014. Passive and Active Forest Simulations and Comparisons with SMAPEx-3 Data, MicroRad 2014, Pasadena, USA, 24-27 March 2014.

Ouellette, J. D., Johnson, J. T., Balenzano, A., Mattia, F., Satalino, G., Kim, S., Walker, J. P., Panciera, R., 2014. A Study of Soil Moisture Estimation from Multi-Temporal L-band Radar Observations of Vegetated SurfacesURSI’14, Boulder, Jan 2014.

Azmi, M., Rüdiger, C. and Walker, J. P., 2013. Weekly Comparative Evaluations of Some High Resolution Water Stress Variables at The Riggs Creek OzFlux Tower SiteMODSIM2013, 20th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, Adelaide, 1-6 December, 2013.

Lievens, H., Al-Bitar, A., Cabot, F., De Lannoy, G., Drusch, M., Dumedah, G., Hendricks Franssen, H., Kerr, Y., Merlin, O., Pan, M., Roundy, J., Sahoo, A., Tomer, S., van den Berg, M. J., Vereecken, H., Verhoest, N., Walker, J. P., Wood, E. and Pauwels, V. R. N., 2013. Assimilation of SMOS Data for Improving Surface Water ManagementMODSIM2013, 20th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, Adelaide, 1-6 December, 2013.

Woodland, R. J., Thomson, J. R., MacNally, R., Walker, J. P., Evrard, V., Lubcke, T., Rüdiger, C., Hawkins, C., Cook, P. L. M. 2013. From The Catchment to The Estuary – Linking Nutrient Loading to Estuarine Food Web Structure22nd Biennial Conference of the Coastal and Estuarine Research Federation, San Diego, California, USA, 3-7 November, 2013.

Walker, J. P., 2013. State-of-the-art in Soil Moisture Remote Sensing4th Asia Oceania Meteorological Satellite Users Conference, Melbourne, Australia, 9-11 October, 2013. Invited

Walker, J. P., Panciera, R., Moneris, A., 2013. Basis of An Australian Radar Soil Moisture Algorithm Theoretical Baseline Document (ATBD)Roadmap to an Australian Civilian Satellite SAR Capability Workshop, 8 October 2013, Sydney, Australia. Invited

Moghaddam, N., Rüdiger, C., Samsonov, S., Walker, J. P. and Hall, M., 2013. Assessment of INSAR Potential in Simulating Subsurface Geological StructureSPIE Remote Sensing, Dresden, Germany, 23-26 September, 2013.

Vittucci, C., Guerriero, L., Ferrazzoli, P., Rahmoune, R., Tanase, M., Panciera, R., Monerris, A., Rüdiger, C., Walker, J. P., 2013. Soil Moisture Monitoring Over Australian Forests Using Airborne DataSatellite Soil Moisture Validation & Application Workshop. ESA/ESRIN, Frascati, Italy, 1-3 July, 2013.

Rüdiger, C., Walker, J. P., Kaihotsu, I., Fujii, H., Yee, M., Monerris, A., 2013. A First Glance at AMSR2 Soil Moisture Observations across AustraliaSatellite Soil Moisture Validation & Application Workshop. ESA/ESRIN, Frascati, Italy, 1-3 July, 2013.

Monerris, A., Rüdiger, C., Zreda, M., Walker, J. P., and Panciera, R., 2012. Mapping Soil Moisture with Cosmic Ray Probes over Grassland3rd SMAP Cal/Val Workshop, Oxnard, CA, 14-16 November, 2012. (poster)

Walker, J. P., Wu, X., Gao, Y., Monerris, A., Panciera, R., Jackson, T.,O’Neill, P., Das, N., Gray, D. and Ryu, D., 2012. The Soil Moisture Active Passive Experiments: SMAPEx3rd SMAP Cal/Val Workshop, Oxnard, CA, 14-16 November, 2012.

Wu, X., Walker, J. P., Panciera, R., Rüdiger, C., and Das, N., 2012. Towards Medium-resolution Brightness Temperature Retrieval from Active and Passive Microwave Observations3rd SMAP Cal/Val Workshop, Oxnard, CA, 14-16 November, 2012. (poster)

Walker, J. P., Wu, X., Gao, Y., Monerris, A., Panciera, R., Jackson, T., Gray, D. and Ryu, D., 2012. Towards SMAP: An Airborne Simulation of The Data Stream. 39th COSPAR Scientific Assembly, Mysore, India, 14-22 July, 2012.

Davenport, I., Fieber, K., Gurney, R., Ferryman, J., Hacker, J. and Walker, J., 2012. Extracting Vertical Foliage Profiles of Individual Eucalypt Trees Using Last Significant Return Airborne Laser Altimetry and On-site PhotographyGeophysical Research Abstracts14, EGU2012-5316, EGU General Assembly 2012, Vienna, Austria, 22-27 April, 2012.

Fieber, K., Davenport, I., Ferryman, J., Gurney, R., Walker, J. and Hacker, J., 2012. Analysis of Full-waveform LiDAR Pulse Properties for Vegetation Discrimination and CharacterisationGeophysical Research Abstracts14, EGU2012-5363-1, EGU General Assembly 2012, Vienna, Austria, 22-27 April, 2012.

Walker, J. P., Monerris, A., Gao, Y., Wu, X., Panciera, R., Tanase, M., Ryu, D., Gray, D., Yardley, H., Goh, A. and Jackson, T. J., 2012. The Soil Moisture Active Passive Experiments: Towards Active Passive Retrieval and DownscalingAGU Chapman Conferencce on Remote Sensing of the Terrestrial Water Cycle, Kona, Hawaii, USA, 19-22 February, 2012.

Pipunic, R., Ryu, D. and Walker, J. P., 2012. The Impact of Assimilating Satellite Surface Soil Moisture Data on Modelled Root Zone Soil Moisture and ET Over a Six Year Period: Assessment Across an In-situ Soil Moisture Monitoring Network in the Murray-Darling Basin, AustraliaAGU Chapman Conferencce on Remote Sensing of the Terrestrial Water Cycle, Kona, Hawaii, USA, 19-22 February, 2012.

Pauwels, V. R. N., Lievens, H., Verhoest, N. E. C., De Lannoy, G., Plaza Guingla, D. A., van den Berg, M. J., Kerr, Y., Al Bitar, A., Merlin, O., Cabot, F., Gascoigne, S., Wood, E., Pan, M., Sahoo, A., Walker, J. P., Dumedah, G. and Drusch, M., 2012. Assimilation of SMOS Data into a Coupled Land Surface and Radiative Transfer Model for Improving Surface Water ManagementAGU Chapman Conferencce on Remote Sensing of the Terrestrial Water Cycle, Kona, Hawaii, USA, 19-22 February, 2012.

Rüdiger, C., Monerris-Belda, A., Mialon, A., Merlin, O., Walker, J. P., Kerr, Y. H. and Kim, E. J., 2012. SMOS Soil Moisture Validation in AustraliaAGU Chapman Conferencce on Remote Sensing of the Terrestrial Water Cycle, Kona, Hawaii, USA, 19-22 February, 2012.

Monerris, A., Rüdiger, C., Zreda, M., Walker, J. P. and Panciera, R., 2012. Mapping Soil Moisture Variability: Inter-comparison Between L-band Radiometry and Cosmic Ray Neutron EmissionsAGU Chapman Conferencce on Remote Sensing of the Terrestrial Water Cycle, Kona, Hawaii, USA, 19-22 February, 2012.

Walker, J. P., Beringer, J., Rüdiger, C. and Daly, E., 2012. Towards global water and energy balance monitoring using GCOM-W1 in the Australian Murray Darling Basin. Joint PI Workshop of Global Environment Observation Mission 2011, Tokyo, Japan, 17-20 January, 2012.

Ye, N., Walker, J. P., Rüdiger, C., Ryu, D. and Gurney, R. J., 2011. Impact of Urban Cover Fraction on SMOS and SMAP Surface Soil Moisture RetrievalAGU Fall Meeting 2011, San Francisco, California, USA, 5-9 December, 2011.

Walker, J. P., Rüdiger, C., Kerr, Y., Mialon, A. and Merlin, O., 2011. Validation of SMOS Soil Moisture in the Murray Darling BasinWCRP OSC Climate Research in Service to Society, Denver, CO, USA, 24-28 October, 2011.

Walker, J. P., Rüdiger, C., Kerr, Y., Mialon, A. and Merlin, O., 2011. SMOS Soil Moisture Validation for Australia. SMOS Science Workshop 2011, Arles, France, 27-29 September, 2011.

Peischl, S., Walker, J. P., Rüdiger, C., Ryu, D. and Kerr, Y., 2011. Validation of the SMOS Multi-incidence Angle Soil Moisture Retrieval over AustraliaSMOS Science Workshop 2011, Arles, France, 27-29 September, 2011.

Wang, S., Li, W., Che, T., Han, X., Walker, J. P., Rüdiger, C., Peischl, S. and Ye, N., 2011. Mapping Surface Soil Moisture Using L-band Radiometer Observations in the Second Australian Airborne Cal/Val Experiment for SMOS (AACES-2)Progress in Electromagnetics Research Symposium PIERS 2011, Suzhou, China, 12-16 September, 2011.

Gray, D., Yardley, H., Walker, J. P., Panciera, R., Hacker, J., McGrath, A. and Bates, B., 2011. Initial Experimental Results from PLIS: Polarimetric L-Band Imaging SARPIRR 2011 Workshop on Progress in Radar Research, Adelaide, Australia, 5-6 May, 2011.

Walker, J. P., Panciera, R., Ryu, D., Gray, D. and Jackson, T., 2011. The Australian SMAPEx and Core Validation Site. 2nd SMAP Cal/Val Workshop, Oxnard, CA, 3-5 May, 2011.

Rüdiger, C., Doubkova, M., Walker, J. P. and Wagner, W., 2011. Similarities of ASAR GW and Passive Airborne L-band ObservationsEUMETSAT/ESA Scatterometer Science Conference, Darmstadt, Germany, 11-13 April, 2011.

Rüdiger, C., Walker, J. P., Kerr, Y. H., Merlin, O., Mialon, A. and Kim, E. J., 2011. SMOS L1c and L2 Product Validation with Airborne and In-situ Observations over South-eastern AustraliaGeophysical Research Abstracts13, EGU2011-5183, EGU General Assembly 2011, Vienna, Austria, 03-08 April, 2011.

Satalino, G., Mattia, F., Balenzano, A., Panciera, R. and Walker, J. P., 2011. Use of Multi-temporal Series of COSMO-SkyMed and PALSAR SAR data for Landcover Classification and Soil Moisture Retrieval over Agricultural SitesGeophysical Research Abstracts13, EGU2011-7816, EGU General Assembly 2011, Vienna, Austria, 03-08 April, 2011.

Peischl, S., Walker, J. P., Ryu, D. and Kerr, Y., 2011. Towards Soil Moisture Retrieval Using Multi-incidence Angle ObservationsGeophysical Research Abstracts13, EGU2011-919, EGU General Assembly 2011, Vienna, Austria, 03-08 April, 2011.

Merlin, O., Rüdiger, C., Richaume, P., Jacquette, E., Mialon, A., Al Bitar, A., Walker, J. P. and Kerr, Y., 2011. Can Evaporation-based Disaggregation Techniques of Surface Soil Moisture Observations Help Improve the Validation Strategies of SMOS Data? Geophysical Research Abstracts13, EGU2011-1722, EGU General Assembly 2011, Vienna, Austria, 03-08 April, 2011.

Walker, J. P., and many others, 2011. Overview: 8-years of Soil Moisture Cal/Val in Australia. The 1st Australian Workshop on Airborne Cal/Val for Microwave Satellite Missions and 5th NAFE Workshop, Monash University, Australia, 23-25 February, 2011.

Rüdiger, C., Walker, J. P., Allahmoradi, M., Bandara, R., Barrett, D., Gurney, R., Kerr, Y., Kim, E., Le Marshall, J., Peischl, S. and Ye, N., 2011. The Australian Airborne Cal/Val Experiment for SMOS (AACES) Field Campaigns. The 1st Australian Workshop on Airborne Cal/Val for Microwave Satellite Missions and 5th NAFE Workshop, Monash University, Australia, 23-25 February, 2011.

Panciera, R., Walker, J. P., Ryu, D., Gray, D. and Jackson, T., 2011. SMAPEx-1 & SMAPEx-2: An Overview. The 1st Australian Workshop on Airborne Cal/Val for Microwave Satellite Missions and 5th NAFE Workshop, Monash University, Australia, 23-25 February, 2011.

Peischl, S., Walker, J. P., Ryu, D., Kerr, Y. and Rüdiger, C., 2011. Estimation of Soil Moisture Retrieval Parameters Using Multi-angular L-band Observations. The 1st Australian Workshop on Airborne Cal/Val for Microwave Satellite Missions and 5th NAFE Workshop, Monash University, Australia, 23-25 February, 2011.

Ye, N., Walker, J. P., Ryu, D. and Gurney, R., 2011. Rock Cover Fraction and Its Influence on Soil Moisture Retrieval. The 1st Australian Workshop on Airborne Cal/Val for Microwave Satellite Missions and 5th NAFE Workshop, Monash University, Australia, 23-25 February, 2011.

Bandara, R., Walker, J. P., Gurney, R. and Rüdiger, C., 2011. Development of a “Soil Hydraulic Property Estimator”. The 1st Australian Workshop on Airborne Cal/Val for Microwave Satellite Missions and 5th NAFE Workshop, Monash University, Australia, 23-25 February, 2011.

Rüdiger, C., Walker, J. P., Kerr, Y., Allahmoradi, M., Bandara, R., Barrett, D., Gurney, R., Kim, E., Le Marshall, J., Peischl, S. and Ye, N., 2011. SAZE-Oz and AACES: First Results. The 1st Australian Workshop on Airborne Cal/Val for Microwave Satellite Missions and 5th NAFE Workshop, Monash University, Australia, 23-25 February, 2011.

Allahmoradi, M., Western, A., Walker, J. P., Ryu, D. and Kim, E., 2011. Multi-sensor Soil Moisture Retrieval Using SMOS. The 1st Australian Workshop on Airborne Cal/Val for Microwave Satellite Missions and 5th NAFE Workshop, Monash University, Australia, 23-25 February, 2011.

Tanase, M., Panciera, R., Lowell, K. and Walker, J. P., 2011. Towards Operational Monitoring of Key Climate Parameters from Synthetic Aperture Radar: Perspective and Challenges. The 1st Australian Workshop on Airborne Cal/Val for Microwave Satellite Missions and 5th NAFE Workshop, Monash University, Australia, 23-25 February, 2011.

Ye, N., Walker, J. P., Ryu, D., Gurney, R. and Rüdiger, C., 2011. The Effect of Rock on Soil Moisture Retrieval from L-band Passive Microwave Observation2011 International Workshop on Soil Moisture and Ocean Salinity (ISMOS 2011), Sanya, China, 15-19 January, 2011.

Panciera, R., Walker, J. P., Ryu, D., Gray, D., Jackson, T. J. and Yardley, H., 2010. The Soil Moisture Active Passive Experiments (SMAPEx) for SMAP Algorithm DevelopmentFall Meeting, AGU, San Francisco, Calif., 13-17 December, 2010. Invited

Rüdiger, C., Walker, J. P., Kerr, Y. H. and Kim, E. J., 2010. SMOS Ground Validation in Australia: Results from Summer and Winter CampaignsFall Meeting, AGU, San Francisco, Calif., 13-17 December, 2010.

Kim, E., Walker, J. P., Rüdiger, C., Costelloe, J., Ye, N., Peischl, S., Allahmoradi, M. and Marks, A., 2010. SMOS/MIRAS Calibration Using Earth Scene TargetsSMOS Validation and Retrieval Teams (VRT) Meeting, Frascati, Italy, November, 2010.

Walker, J. P., Rüdiger, C., Allahmoradi, M., Bandara, R., Barrett, D., Gurney, R., Kerr, Y., Kim, E., Le Marshall, J., Peischl, S. and Ye, N., 2010. The Australian Airborne CAL/VAL Experiment for SMOS. SMOS Validation and Retrieval Teams (VRT) Meeting, Frascati, Italy, November, 2010.

Satalino, G., Balenzano, A., Panciera, R., Walker, J. P. and Mattia, F., 2010. Soil Moisture Retrieval from Temporal Series of PALSAR ScanSAR DataThe 4th Joint PI Symposium of ALOS Data Nodes for ALOS Science Program, Tokyo, 15-17 November, 2010.

Kim, E., Walker, J. P., Rüdiger, C., and Panciera, R., 2010. Australian Soil Moisture Field Experiments in Support of Soil Moisture Satellite ObservationsRemote Sensing and Hydrology 2010 Symposium, Jackson Hole, Wyoming, USA, Sept 2010.

French, A., Rüdiger, C., and Walker, J. P., 2010. Thermal Infrared Observations for the SMOS Arid Zone Experiments in Australia. Remote Sensing and Hydrology 2010 Symposium, Jackson Hole, Wyoming, USA, Sept 2010.

Rüdiger, C., Walker, J. P., Pipunic, R. and de Lannoy, G., 2010. A Soil Moisture Monitoring and Prediction System for AustraliaThe Fourth International Workshop on Catchment-scale Hydrological Modeling and Data Assimilation (4th CAHMDA), Lhasa, China, 21-23 July, 2010.

Pipunic, R., Walker, J. P. and de Lannoy, G., 2010. Investigating Model Error Using Data AssimilationThe Fourth International Workshop on Catchment-scale Hydrological Modeling and Data Assimilation (4th CAHMDA), Lhasa, China, 21-23 July, 2010.

Walker, J. P., 2010. Hydrologic Model Data Assimilation: Next Steps. The Fourth International Workshop on Catchment-scale Hydrological Modeling and Data Assimilation (4th CAHMDA), Lhasa, China, 21-23 July, 2010. Keynote talk

Rüdiger, C., Walker, J. P., Pipunic, R., Mahfouf, J. F., Calvet, J. C. and Albergel, C., 2010. Towards Multi-parameter Assimilation in Land Surface ModelsGEWEX/CEOP, Lhasa, China, 19-21 July, 2010.

Walker, J. P., Rüdiger, C., Allahmoradi, M., Barrett, D., Gurney, R., Kerr, Y., Kim, E., Le Marshall, J., Peischl, S. and Ye, N., 2010. The Australian Airborne CAL/VAL Experiment for SMOS – First Results. Proceedings of the ESA Living Planet Symposium, Bergen, Norway, 28 June-2 July, 2010.

Kim, E., Walker, J. P., Rüdiger, C., Costelloe, J., Ye, N., Peischl, S., Allahmoradi, M. and Marks, A., 2010. SMOS/MIRAS Calibration Using Earth Surface Targets. Proceedings of the ESA Living Planet Symposium, Bergen, Norway, 28 June-2 July, 2010.

Rahmoune, R., Ferrazzoli, P., Walker, J. P., and Grant, J. P., 2010. L-Band Emission From a Eucalyptus Forest in Various Soil Conditions During the NAFE Campaign. 11th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment, MicroRad’10, Washington DC, USA, Mar 2010.

Calvet, J. -C., Albergel, C, Crapeau, M., Draper, C., Kerr, Y., Mahfouf, J. -F. Mialon, A., Rüdiger, C., Walker, J. P., Wigneron, J. -P., Zribi, M., 2009. Assimilation of Earth Observation Data in the ISBA Land Surface Model of Météo-France. Earth Observation and Water Cycle Conference, ESRIN, Italy, 18-20 November 2009.

Pipunic, R., Walker, J. P. and Western, A., 2009. A Comparison of Land Surface Model Data Assimilation Approaches to Improve Heat Flux Estimates for Numerial Weather Prediction. 5th WMO Symposium on Data Assimilation, pp.66-67. Melbourne, Australia, 5-9 October 2009.

Panciera, R., Walker, J. P., Ryu, D., Gray, D., and Jackson, T., 2009. SMAPEx: Soil Moisture Active Passive Remote Sensing Experiment for SMAP Algorithm Development6th International Scientific Conference on the Global Energy and Water Cycle (GEWEX), Melbourne, Australia, 24-28 August, 2009.

Rüdiger, C., Smith, A., Draper, C., Walker, J. P., Western, A., 2009. Hydrological Assessment of the Australian Land Surface Model CABLE in the Murray Darling Basin via Remotely Sensed Soil Moisture. 6th International Scientific Conference on the Global Energy and Water Cycle (GEWEX), Melbourne, Australia, 24-28 August, 2009.

Rüdiger, C., Walker, J. P., Barrett, D., Gurney, R., Kerr, Y., Kim, E., LeMarshall, J., 2009. MoistureMap: Towards a soil moisture monitoring, prediction and reporting system for sustainable land and water management. 6th International Scientific Conference on the Global Energy and Water Cycle (GEWEX), Melbourne, Australia, 24-28 August, 2009.

Pipunic, R., Walker, J. P., Western, A., 2009. Data Assimilation for Better Heat Flux Predictions from Land Surface Models6th International Scientific Conference on the Global Energy and Water Cycle (GEWEX), Melbourne, Australia, 24-28 August, 2009.

Davenport, I., Walker, J. P., Gurney, R., 2009. Measuring Vegetation Structure with Airborne Laser Altimetry6th International Scientific Conference on the Global Energy and Water Cycle (GEWEX), Melbourne, Australia, 24-28 August, 2009.

Panciera, R., Walker, J. P., Kim, E. J., Kalma, J. D., 2009. A Proposed Improvement to the SMOS Soil Moisture Retrieval Algorithm in the Presence of Strong Land-Surface Heterogeneity2nd Integrated Land Ecosystem-Atmosphere Processes Study Science Conference (iLEAPS), Melbourne, Australia, 24-28 August, 2009.

Walker, J. P., Rüdiger, C., Calvet, J. -C., and Kerr, Y., 2009. An Insitu-model-aircraft cross Validation Strategy for SMOS2nd Workshop on Remote Sensing and Modeling of Surface Properties, Toulouse, France, 9-11 June, 2009.

Calvet, J. -C., Albergel, C., Rüdiger, C., Walker, J., Wigneron, J. -P., Chanzy, A., Kerr, Y., 2009. Validation of Satellite Soil Moisture Products in Southwestern France Using Model Simulations and In-situ Data. 2nd Workshop on Remote Sensing and Modeling of Surface Properties, Toulouse, France, 9-11 June, 2009.

Walker, J. P., Rüdiger, C. and the MoistureMap Team, 2009. A Potential Ground Calibration Target for SMOSGeophysical Research Abstracts [CD-ROM]11, EGU2009-6416, EGU General Assembly, Vienna, Austria, April 2009.

Walker, J. P., Allahmoradi, M., Peischl, S., Ye, N. and the MoistureMap Team, 2009. Towards an Australian Validation of SMOSGeophysical Research Abstracts [CD-ROM]11, EGU2009-6426, EGU General Assembly, Vienna, Austria, April 2009.

Draper, C., Mahfouf, J. -F., and Walker, J. P., 2009. EKF Assimilation of Near-surface Soil Moisture into ISBA: A Comparison of Error Covariance Evolution ApproachesGeophysical Research Abstracts [CD-ROM]11, EGU2009-3897, EGU General Assembly, Vienna, Austria, April 2009.

Walker, J. P., Rüdiger, C., Kerr, Y, Kim, E., and the MoistureMap Team, 2009. Towards a SMOS Calibration Site in the Australian Arid Zone, SMOS Validation & Retrieval Team Readiness Review Workshop, Lisbon, March 2009.

Walker, J. P., Allahmoradi, M., Peischl, S., Ye, N. and the MoistureMap Team, 2009. Towards an Australian Validation of SMOS, SMOS Validation & Retrieval Team Readiness Review Workshop, Lisbon, March 2009.

Walker, J. P., Rüdiger, C., Panciera, R., Kerr, Y., Jackson, T., Ryu, D., and the MoistureMap Team, 2009. Towards SMOS and SMAP: An Australian Perspective, Third International Soil Moisture Working Group Meeting, Lisbon, March 2009. Invited

de Jeu, R. A. M., Holmes, T. R. H., Panciera, R., Walker, J. P. and Dolman, H. 2008. The Performance of the Land Parameter Retrieval Model (LPRM) at Different Scales and FrequenciesEOS, Transactions American Geophysical Union89(53), Fall Meeting Supplement, Abstract H41D-0900. Dec 2008.

Mladenova, I., Lakshmi, V., Jackson, T., Walker, J. P., Merlin, O. and de Jeu, R. A. M., 2008. The Impact of Standing Water and Irrigation on AMSR-E Sensitivity to Soil Moisture over the NAFE’06 Experiment AreaEOS, Transactions American Geophysical Union89(53), Fall Meeting Supplement, Abstract H41D-0908. Dec 2008.

Mladenova, I., Lakshmi, V., Walker, J. P., Panciera, R., Wagner, W. and Doubkova, M. 2008. Can the ASAR Global Monitoring Mode Adequately Capture Spatial Soil Moisture Variability? EOS, Transactions American Geophysical Union89(53), Fall Meeting Supplement, Abstract H54A-04. Dec 2008.

Holmes, T. R. H., de Jeu, R. A. M., Parinussa, R. and Walker, J. P., 2008. Evaluation of Satellite Derived Land Surface Temperatures over the NAFE Research SitesGeophysical Research Abstracts [CD-ROM]10, EGU2008-A-03479, EGU General Assembly, Vienna, Austria, April 2008.

Saleh, K., kerr, Y. H., Boulet, G., Escorihuela, M. J., Maisongrande, P., Richaume, P., de Rosnay, P., Wigneron, J. P., López-Baeza, E., Grant, J. P., Delwart, S., Berger, M., Panciera, R. and Walker, J. P., 2008. Main Outcomes of the CoSMOS/NAFE Campaign for the Validation of SMOS Soil Moisture Retrieval Algorithm, 10th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment [CD-ROM], MicroRad’08, Florence, Italy, Mar 2008.

Lakshmi, V., Mladenova, I., Jackson, T., Long, D., and Walker, J. P., 2007. Assessment of Potential AMSR-E Soil Moisture Disaggregation Using Scatterometer ObservationsEOS, Transactions American Geophysical Union88(52), Fall Meeting Supplement, Abstract H31D-0633.

Merlin, O., Walker, J. P. and Kerr, Y., 2007. Remote Sensing of Soil MoistureWorkshop on Hydrological Consequences of Climate Change, Canbera, Australia, November 2007. Invited Keynote

Walker, J. P., 2007. Soil Moisture Monitoring Activities Downunder, Second International Soil Moisture Monitoring Workshop, Institute of Atmospheric Physics of the Chinese Academy of Sciences, Beijing, China, November 2007. Invited

Escorihuela, M. -J., Kerr, Y. and Walker, J. P., 2007. Assessment of Sun-glint Effects Over Land7th SMOS Workshop, Frascatti, Italy, October 2007.

Saleh, K., Kerr, Y., Boulet, G., Escoriheuela, M. -J., Massiongrande, P., Richaume, P., de Rosnay, P., Wigneron, J. -P., Cano, A., López-Baeza, E., Grant, J., Skou, N., Panciera, R., Walker, J. P., Berger, M. and Delwart, S., 2007. The ESA CoSMOS Study for the Validation of the SMOS Soil Moisture L2 Prototype7th SMOS Workshop, Frascatti, Italy, October 2007.

Panciera, R., Walker, J. P., Merlin, O., Kalma, J. D., Kim, E. J. and Hacker, J., 2007. The National Airborne Field Experiment 2006 (NAFE’06) Dataset7th SMOS Workshop, Frascatti, Italy, October 2007.

Panciera, R., Walker, J. P., Kim, E. J., Kalma, J. D., Hacker, J., Merlin, O., Saleh, K., Wigneron, J. -P. and Grant, J., 2007. SMOS L2 L-band Soil Moisture Retrieval During NAFE’057th SMOS Workshop, Frascatti, Italy, October 2007.

Pipunic, R., Walker, J. P., Trudinger, C. and Western, A. W., 2007. A One-Dimensional Data Assimilation Experiment Using 3D Eddy Covariance Heat Flux Observations to Improve Land Surface ModellingEOS, Transactions American Geophysical Union88(23), Joint Assembly Supplement, Abstract H32A-06.

Draper, C., Walker, J. P. and Steinle, P., 2007. How Well Does AMSR-E Data Represent Soil Moisture Over Australia? EOS, Transactions American Geophysical Union88(23), Joint Assembly Supplement, Abstract H51C-03.

Panciera, R., Walker, J. P., Merlin, O., Kalma, J., Kim, E. and Hacker, J., 2007. The National Airborne Field Experiment 2006 (NAFE’06) DatasetEOS, Transactions American Geophysical Union88(23), Joint Assembly Supplement, Abstract H51C-01.

Gruhier, C., de Rosnay, P., Richaume, P., Kerr, Y., Rüdiger, C., Boulet, G., Walker, J. P., Mougin, E., Ceschia, E. and Calvet, J, -C., 2007. Large Scale Evaluation of AMSR-E Soil Moisture Products Based on Ground Soil Moisture Network MeasurementsEOS, Transactions American Geophysical Union88(23), Joint Assembly Supplement, Abstract H51C-02.

Teuling, A. J., Hurkmans, R., Merlin, O., Panciera, R. and Walker, J. P., 2007. Surface Soil Moisture Variability During NAFE’06Geophysical Research Abstracts [CD-ROM]9, EGU2007-A-03759, EGU General Assembly, Vienna, Austria, April 2007.

Gruhier, C., de Rosnay, P., Richaume, P., Kerr, Y., Rüdiger, C., Walker, J. P., Mougin, E., Ceschia, E., and Calvet, J. -C., 2007. Large Scale Evaluation of AMSR Soil Moisture Products Based on Ground Soil Moisture Network MeasurementsGeophysical Research Abstracts [CD-ROM]9, EGU2007-A-07725, EGU General Assembly, Vienna, Austria, April 2007.

Merlin, O., Walker, J. P., Panciera, R., Kalma, J., Kim, E. and Hacker, J., 2007. The National Airborne Field Experiments: Towards 1 km Resolution Soil Moisture, Workshop on Satellite Observations of the Global Water Cycle, Irvine, USA, March 2007.

Kim, E., Tedesco, M., Walker, J. P., and Panciera, R., 2007. Observed Spatial Variability of Snow and Soil Moisture Signatures from the CLPX1 and NAFE’05 Campaigns, Workshop on Satellite Observations of the Global Water Cycle, Irvine, USA, March 2007.

Pipunic, R., Walker, J. P., Trudinger, C. and Western, A., 2007. Heat Flux Data Assimilation for Improved Land Surface Modelling: A One Dimensional Field Data Case Study, Workshop on Satellite Observations of the Global Water Cycle, Irvine, USA, March 2007.

Thyer, M. and Walker, J. P., 2007. A Bayesian Approach to Characterizing Uncertainty in Remotely Sensed Soil Moisture Measurements Using the NAFE Dataset, Workshop on Satellite Observations of the Global Water Cycle, Irvine, USA, March 2007.

Panciera, R., Walker, J. P., Kalma, J. D. and Kim, E. J., 2007. Scaling properties of passive microwave soil moisture signatures during NAFE05, Workshop on Satellite Observations of the Global Water Cycle, Irvine, USA, March 2007.

Draper, C., Steinle, P. and Walker, J. P., 2007. Soil moisture data in NWP, Workshop on Satellite Observations of the Global Water Cycle, Irvine, USA, March 2007.

Pipunic, R., Walker, J. P., Trudinger, C. and Western, A., 2007. Heat Flux Data Assimilation for Improved Land Surface Modelling – A One-dimensional Field Data Case Study14th Australian Meteorological and Oceanographic Society National Conference. Adelaide, Australia. February 5-8, 2007.

Draper, C., Steinle, P. and Walker, J. P., 2007. Soil Moisture Data in NWP14th Australian Meteorological and Oceanographic Society National Conference. Adelaide, Australia. February 5-8, 2007.

Ellett, K. M., Western, A. W., Walker, J. P., Sirawardena, L., Young, R. I., Smith, A. B., Flint, A. L. and Summerell, G., 2006. The Murrumbidgee Monitoring Network: Supporting CEOP, GEWEX and Hydrological Research in the Murray-Darling Basin, AustraliaEOS, Transactions American Geophysical Union87(52), Fall Meeting Supplement, Abstract H34A-05.

Walker, J. P., 2006. Hydrologic Remote Sensing13th Australasian Remote Sensing and Photogrammetry Conference. Canberra, Australia. November 20-24, 2006. Invited Keynote

Merlin, O., Walker, J. P., Panciera, R., Kalma, J. D., Kim, E. and Hacker, J. M., 2006. The National Airborne Field Experiments: Towards 1 km Resolution Soil MoistureWorkshop on Recent Advances in Quantitative Remote Sensing, Valencia Spain, September 2006.

Berg, A. A. and Walker, J. P., 2006. Sensitivity of a Land Surface Model and Soil Moisture Assimilation Sytem to Bias in the Hydrometeorological Forcing32nd Annual Meeting of the Canadian Geophysical Union. Banff, Alberta, Canada. May 14-17, 2006.

Walker, J. P., Merlin, O., Pancierra, R. and Kalma, J. D., 2006. The 2006 National Airborne Field Experiment PlanEOS, Transactions American Geophysical Union87(36), Joint Assembly Supplement, Abstract H33A-01. Invited

Ellett, K., Walker, J. P., Western, A. W. and Rodell, M., 2006. Investigating the Potential for Direct Assimilation of Terrestrial Water Storage Observations from the GRACE Satellite MissionEOS, Transactions American Geophysical Union87(36), Joint Assembly Supplement, Abstract H21B-02.

Rodell, M., Reichle, R., Ellett, K., Walker, J. P., Lemoine, F. and Kato, H., 2006. Land Surface Model Assimilation of Data from GRACE and Other Satellites EOS, Transactions American Geophysical Union87(36), Joint Assembly Supplement, Abstract H21B-01. Invited

Walker, J. P., Panciera, R., Merlin, O. and Kalma, J. D., 2006. Towards 1km Root Zone Soil Moisture from SMOS: The National Airborne Field Experiments6th SMOS Workshop, Copenhagen, Denmark, May 2006.

Grant, J. P., Van de Griend, A. A., Wigneron, J, -P., Walker, J. P., Kalma, J. D., Saleh, K. and Panciera, R., 2006. Influence of Surface Heterogeneity on L-band (1.4 GHz) Measurements at Various Spatial Resolutions: Some Preliminary Results of the NAFE/CoSMOS 2005 Field Campaign6th SMOS Workshop, Copenhagen, Denmark, May 2006. (Poster)

Macelloni, G., Palosvia, S., Pampaloni, P., Floury, N., Drinkwater, M., Kim, E. and Walker, J. P., 2006. Assessment of Instrument Stability and Calibration by Using Extended Targets: Antarctic Plateau (Dome-C) and Forests, 6th SMOS Workshop, Copenhagen, Denmark, May 2006.

Kim, E., Walker, J. P., Tedesco, M. and Dindschadler, B., 2006. Evaluation of Antarctic and Tropical Forest Sites for Calibration and Cross-Calibration of Spaceborne L-band Radiometers, 6th SMOS Workshop, Copenhagen, Denmark, May 2006.

Walker, J. P., Panciera, R., Merlin, O., Kalma, J. D., Kim, E. J. and Hacker, J. M., 2006. The National Airborne Field ExperimentsGeophysical Research Abstracts [CD-ROM]8, EGU06-A-03766, EGU General Assembly, Vienna, Austria, April 2006.

Panciera, R., Walker, J. P., Kalma, J. D. and Kim, E. J., 2006. The National Airborne Field Experiment: Scaling Properties of Passive Microwave Soil Moisture SignaturesGeophysical Research Abstracts [CD-ROM]8, EGU06-A-01275, EGU General Assembly, Vienna, Austria, April 2006. (Poster)

Pipunic, R., Walker, J. P., Trudinger, C. and Western, A. W., 2006. Assimilation for Latent and Sensible Heat Flux Prediction-A Synthetic StudyGeophysical Research Abstracts [CD-ROM]8, EGU06-A-05388, EGU General Assembly, Vienna, Austria, April 2006. (Poster)

Thyer, M. and Walker, J. P., 2006. A Bayesian Approach to Characterizing Uncertainty in Remote Sensed Soil Moisture Measurements using the NAFE datasetGeophysical Research Abstracts [CD-ROM]8, EGU06-A-09976, EGU General Assembly, Vienna, Austria, April 2006. (Poster)

Berger, M., Kerr, Y. and Walker, J. P., 2006. coSMOS: Field Validation of the SMOS Soil Moisture Retrieval AlgorithmGeophysical Research Abstracts [CD-ROM]8, EGU06-A-10763, EGU General Assembly, Vienna, Austria, April 2006.

Rüdiger, C., Walker, J. P., Kalma, J. D., Willgoose, G. R. and Houser, P. R., 2006. Streamflow Assimilation: On the Effect of Model BiasesGeophysical Research Abstracts [CD-ROM]8, EGU06-A-05322, EGU General Assembly, Vienna, Austria, April 2006. (Poster)

Walker, J. P. and Western, A. W., 2006. Soil Moisture Monitoring: Whither Shall We Measure? Soil Moisture Monitoring Workshop, ESA-ESTEC, Nordwijk, The Netherlands, March 2006.

Kim, E. J., Tedesco, M., Walker, J. P. and Panciera, R., 2006. Observed Scaling Behavior of Snow and Soil Moisture Signatures from the CLPX and NAFE Campaigns9th Specialist Meeting on Microwave Radiometry and Remote Sensing Applications [CD-ROM], MicroRad’06, San Juan, Puerto Rico, Feb 2006.

Berger, M., Kerr, Y. and Walker, J. P., 2005. coSMOS: Field Validation of the SMOS Soil Moisture Retrieval AlgorithmThe 9th International Symposium on Physical Measurements and Signatures in Remote Sensing, 17-19 Oct 2005, Beijing, China.

Walker, J. P., 2005. Land Surface Model Data Assimilation for Atmospheric PredictionProceedings 2nd Asia Oceania Geosciences Society [CD-ROM], OA19/1A-02-1/206. Invited

Smith, A. B., Walker, J. P. and Western, A. W., 2005. Assimilation of Gravity Data Into a Soil Moisture and Groundwater Column ModelProceedings 2nd Asia Oceania Geosciences Society [CD-ROM], OA19/1A-02-2/206.

Turner, M. R. J., Walker, J. P., Oke, P. P. and Grayson, R. B., 2005. Assimilation of AVHRR Water Temperature Observations into a Coastal Hydrodynamic ModelProceedings 2nd Asia Oceania Geosciences Society [CD-ROM], OA19/1A-02-5/206.

Walker, J. P., and Houser, P. R., 2005. Challenges and Solutions to High Resolution Soil Moisture MappingEOS, Transactions American Geophysical Union86(18), Joint Assemply Supplement, Abstract G23A-06. Invited

Rüdiger, C., Walker, J. P., Kalma, J. D., Willgoose, G. R. and Houser, P. R., 2005. Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface ModelGeophysical Research Abstracts [CD-ROM]7, EGU05-A-02972, EGU General Assembly, Vienna, Austria, April 2005.

Turner, M., Walker, J. P., Oke, P. and Grayson, R. B., 2005. Sequential Data Assimilation of Satellite Data into a Coastal Hydrodynamic ModelGeophysical Research Abstracts [CD-ROM]7, EGU05-A-02476, EGU General Assembly, Vienna, Austria, April 2005.

Willgoose, G. R., Hemakumara, M., Kalma, J. D., Walker, J. P. and Rüdiger, C., 2005. The Spatial and Temporal Distribution of Point Scale Soil Water in a Semi-arid Catchment and Some Implications for Catchment Scale PredictabilityGeophysical Research Abstracts [CD-ROM]7, EGU05-A-04970, EGU General Assembly, Vienna, Austria, April 2005. Invited

Walker, J. P., 2005. Towards Remote Sensing for Hydrologic Prediction in Ungauged BasinsVIIth IAHS Scientific Assembly, Symposia 7.3 – New Data Collection Approaches and Model Development, Foz do Iguacu, Brazil. Invited

Walker, J. P., and Kandel, D. D., 2004. Brightness Temperature versus Surface Soil Moisture AssimilationEOS, Transactions American Geophysical Union85(47), Fall Meeting Supplement, Abstract H12A-01.

Zhan, X, Houser, P. R., and Walker, J. P., 2004. Jointly Retrieving Surface Soil Moisture from Active and Passive Microwave Observations Using Cubist Data MiningEOS, Transactions American Geophysical Union85(47), Fall Meeting Supplement, Abstract SF11A-04. Invited

Rüdiger, C., Walker, J. P., Kalma, J. D., Willgoose, G. R. and Houser, P. R., 2004. A Catchment Based Study on Streamflow Data AssimilationEOS, Transactions American Geophysical Union, Western Pacific Meeting Supplement, Abstract H23A-63.

Smith, A. B., Walker, J. P., Western, A. W., Ellett, K. M., Grayson, R. B. and Rodell, M., 2004. Factors Affecting the Detection of a Soil Moisture Signal in Field Relative Gravity MeasurementsEOS, Transactions American Geophysical Union, Western Pacific Meeting Supplement, Abstract H23C-02.

Dong, J., Walker, J. P., Houser, P. R., Foster, J. L. and Kelly, R., 2004. Investigation on the Uncertainty of Passive Microwave Snow Water Equivalent EstimatesEOS, Transactions American Geophysical Union, Western Pacific Meeting Supplement, Abstract H23A-60.

Rüdiger, C., Walker, J. P., Kalma, J. D., Willgoose, G. R. and Houser, P. R., 2004. Retrieving Soil Moisture States Using Streamflow AssimilationEOS, Transactions American Geophysical Union85(17), Joint Assembly Supplement, Abstract H12B-03.

Savige, C. L., French, A. N., Western, A. W., Walker, J. P., Abuzar, M., Hacker, J. M. and Kalma, J. D., 2004. Testing Remotely Sensed Evapotranspiration Estimates Using Airborne and Ground MeasurementsEOS, Transactions American Geophysical Union85(17), Joint Assembly Supplement, Abstract H12B-04.

Ellett, K. M., Walker, J. P., Grayson, R. B., Smith, A. and Rodell, M, 2004. GRACE in the Murray Darling Basin: Integrating Remote Sensing with Field Monitoring to Improve Hydrological Model PredictionEOS, Transactions American Geophysical Union85(17), Joint Assembly Supplement, Abstract H23A-02.

Hemakumara, M., Rüdiger, C., Jacobs, B., Kalma, J. D., Walker, J. P., Willgoose, G. R., Hancock, G. and Saco, P., 2004. Scaling and Assimilation of Soil Moisture and Streamflow (SASMAS): Project Overview and Preliminary ResultsGeophysical Research Abstracts6, 06693, EGU, Nice, France, April 2004.

Ellett, K. M., Walker, J. P., Grayson, R. B., Smith, A. and Rodell, M, 2004. GRACE in the Murray Darling Basin: Integrating Remote Sensing with Field Monitoring to Improve Hydrological Model PredictionGRACE Hydrology Workshop, Irvine, USA, March 2004. Invited

Ellett, K., Walker, J. P., Grayson, R. B., Smith, A. and Rodell, M., 2004. GRACE in the Murray-Darling Basin: Using Gravity Measurements to Improve Hydrologic Prediction in Catchment-scale ModelsWorkshop on Prediction in Ungauged Basins, Perth, Australia, Febuary 2004.

Walker, J. P., Grayson, R. B., Panciera, R., Zhan, X., and Houser, P. R., 2003. AMSR-E Soil Moisture Validation Efforts in the Australian Arid ZoneEOS, Transactions American Geophysical Union84(46), Fall Meeting Supplement, Abstract H22E-05.

Walker, J. P., Ursino, N., Grayson, R. B., and Houser, P. R., 2003. Root Zone Soil Moisture: Assimilation of SMMR ObservationsGeophysical Research Abstracts [CD-ROM]5, EAE03-A-01090, AGU-EGS-EGU Joint Assembly, Nice, France, April 2003.

Walker, J. P., Grayson, R. B., Rodell, M. and Ellett, K. M., 2003. Gravity Changes, Soil Moisture and Data AssimilationGeophysical Research Abstracts [CD-ROM]5, EAE03-A-04526, AGU-EGS-EGU Joint Assembly, Nice, France, April 2003.

Rodell, M., Velicogna, I., Walker, J. P., and Reichle, R., 2003. Assimilation of GRACE Derived Terrestrial Water Storage into a Hydrological Land Surface ModelGeophysical Research Abstracts [CD-ROM]5, EAE03-A-13397, AGU-EGS-EGU Joint Assembly, Nice, France, April 2003.

Ni-Meister, W., Walker, J. P., Reichle, R. H., Houser, P. R., and Koster, R. D., 2002. Soil Moisture Intialization for Climate Predictions: Assimilating SMMR into a Land Surface ModelEOS, Transactions American Geophysical Union, 83(47), Fall Meeting Supplement, Abstract H62D-0894.

Zhan, X., Houser, P. R., Walker, J. P. and Reichle, R. H., 2002. Estimation of Model Error Covariance Matrices of the Extended Kalman Filter for Validation of AMSR-E Soil Moisture ProductEOS, Transactions American Geophysical Union, 83(47), Fall Meeting Supplement, Abstract H62D-0895.

Walker, J. P., 2002. Towards an Australian Root Zone Soil Moisture ProductWillgoose Symposium, Newcastle, Australia, 25 October, 2002.

Rüdiger, C., Walker, J. P., Willgoose G. R., Kalma, J. D., Davidson, R., Hemakumara, M., Houser, P. R. and Woods, R., 2002. Scaling and Assimilation of Soil Moisture and Streamflow (SASMAS)Willgoose Symposium, Newcastle, Australia, 25 October, 2002.

Davidson, R. E. and Walker, J. P., 2002. Soil Moisture Monitoring in the Goulburn River CatchmentWillgoose Symposium, Newcastle, Australia, 25 October, 2002.

Zhan, X., Entin, J., Houser, P. R., Reichle, R. H. and Walker, J. P., 2002. Application of Kalman Filtering for Soil Moisture Data Assimilation in GSFC’s Land Data Assimilation SystemEOS, Transactions American Geophysical Union, 83(19): S194.

Meng, C. J., Houser, P. R., Mitchell, K., Rodell, M., Gottschalck, J., Jambor, U., Arsenault, K., Bosilovich, M., Cosgrove, B., Entin, J. K., Radakovich, J., Walker, J. P., Pan, H. and Gayno, G., 2002. Validation of Global LDAS Radiative ForcingEOS, Transactions American Geophysical Union, 83(19): S163.

Walker, J. P. and Houser, P. R., 2001. Initialization of Soil Moisture in a Global Climate Model: A North American Case StudyEOS, Transactions American Geophysical Union, 82(47): F457.

Ni-Meister, W., Walker, J. P. and Houser, P. R., 2001. Better use of Remotely Sensed Soil Moisture to Initialize Soil Moisture in Global Climate ModelsEOS, Transactions American Geophysical Union, 82(47): F457.

Meng, C. J., Houser, P. R., Mitchell, K., Gayno, G., Rodell, M., Jambor, U., Gottschalck, J., Cosgrove, B., Radakovich, J., Arsenault, K., Bosilovich, M., Entin, J. K., Walker, J. P. and Pan, H., 2001. Implementation of the AFWA AGRMET Solar Radiation Scheme in GLDASEOS, Transactions American Geophysical Union, 82(47): F422.

Houser, P. R., Sun, C. and Walker, J. P., 2001. Continental-scale Assimilation of Remotely Sensed Snow ObservationsEOS, Transactions American Geophysical Union, 82(47): F548. Invited

Walker, J. P. and Houser, P. R., 2001. Initialization of Soil Moisture in a Global Climate Model: A North American Case Study, In: E. E. van Loon and P. A. Troch (Ed.), Book of Abstracts: International Worshop on Catchment-scale Hydrological Modeling and Data Assimilation, Wageningen, The Netherlands, September 3-5, 2001, Rapport 101.

Sun, C., Walker, J. P. and Houser, P. R., 2001. Assimilation of Remotely Sensed Snow Observations in a Catchment-based Land Surface Model, In: E. E. van Loon and P. A. Troch (Ed.), Book of Abstracts: International Worshop on Catchment-scale Hydrological Modeling and Data Assimilation, Wageningen, The Netherlands, September 3-5, 2001, Rapport 101.

Reichle, R. H., Walker, J. P., Koster, R. D., Reinecker, M. M. and Houser, P. R., 2001. Soil Moisture Assimilation with the Ensemble Kalman Filter in Support of NASA’s Seasonal-to-Interannual Prediction Project, In: E. E. van Loon and P. A. Troch (Ed.), Book of Abstracts: International Worshop on Catchment-scale Hydrological Modeling and Data Assimilation, Wageningen, The Netherlands, September 3-5, 2001, Rapport 101.

Walker, J. P. and Houser, P. R., 2001. Accuracy Requirements for a Soil Moisture MissionEOS, Transactions American Geophysical Union, 82(20): S158.

Berg, A. A., Famiglietti, J. S., Walker, J. P., and Houser, P. R., 2001. The Sensitivity of Land Surface Model Simulations to the NCEP/NCAR, ERA-15, and Bias Reduced Forcing DatasetsEOS, Transactions American Geophysical Union, 82(20): S188.

Sun, C., Walker, J. P. and Houser, P. R., 2001. Snow Data Assimilation in a Catchment-Based Land Surface ModelEOS, Transactions American Geophysical Union, 82(20): S158.

Entin, J. K., Houser, P. R., Walker, J. P. and Bourke, E., 2001. Data Assimilation of 10 GHz Brightness Temperatures into a Land Surface ModelEOS, Transactions American Geophysical Union, 82(20): S186.

Famiglietti, J. S., Olivera, F., Walker, J. P., Houser, P. R. and Rodell, M., 2001. A Catchment-Based Global River Routing Scheme for Climate Models and Assimilation of Streamflow and Altimetry DataEuropean Geophysical Society 26th General Assembly, Nice, France, 20-25 March 2001.

Berg, A. A., Famiglietti, J. S., Walker, J. P. and Houser, P. R., 2000. Production of a Catchment-Based Hydrometeorological Forcing Data Set for North AmericaEOS, Transactions American Geophysical Union, 81(48): F395.

Walker, J. P. and Houser, P. R., 2000. A Synthetic Study of Near-Surface Soil Moisture Assimilation for North AmericaEOS, Transactions American Geophysical Union, 81(19): S203.

Walker, J. P., Kurera, D. F. and Houser, P. R., 2000. A Field Evaluation of ERS-2 Synthetic Aperture Radar Data for Soil Moisture MeasurementEOS, Transactions American Geophysical Union, 81(19): S207.

Walker, J. P., Willgoose, G. R. and Kalma, J. D., 1999. Assimilation of Surface Soil Moisture Data into a ModelEOS, Transactions American Geophysical Union, 80(46): F408.

Walker, J. P., Willgoose, G. R. and Kalma, J. D., 1998. Towards Profile Soil Moisture Retrieval From Remote SensingEOS, Transactions American Geophysical Union, 79(17): S41.

Media

A Guiding Light: A Helping Hand, Weekend Australian, 15 September 2012. (pdf 241kB)

Yanco is Still Ideal for NASA, The Irrigator, 16 September 2011. (pdf 135kB)

On Target in Agriculture2RG, 9 September 2011. (mp3 9.8MB)

Satellites Could Keep Eye Out for FloodsNew Scientist, 10 February 2011. (pdf 152kB)

Country HourABC, May 2010. (mp3 1.9MB)

Australian Field Campaign Validates SMOS DataEuropean Space Agency, March 2010. (pdf 78kB)

Revolutionary Environmental Engineering ResearchMelbourne University Staff/Student E-news, March 2010. (pdf 14kB)

Australian Research Council Annual Report 2007-08, 2008. (pdf 63kB)

The Word From on High: We’re Drying Up FastSydney Morning Herald, 30 December 2006. (pdf 19kB)

Staff Profile – Jeff WalkerCEE Bulletin, November 2006. (pdf 343kB)

Eye in Space to Help Gauge Deep Moisture in Farm SoilsMelbourne UniNews, 15(22), 27 November – 11 December 2006. (jpg 1.1MB)

2AY Interview on NAFE’06, 13 November 2006.

Planting Crops Set for High Tech BoostSydney Morning Herald, 11 November 2006. (jpg 2.1MB)

Space Satellite to Help Farmers Gauge Water Levels in PaddocksUniversity of Melbourne Media Release, 11 November 2006. (pdf 65kB)

Leetons Skies Aid in Making New Farm ToolThe Irrigator, 10 November 2006. (jpg 3.2MB)

Eye in the SkyABC Riverina, 9 November 2006. (wma 4.2MB)

Glider Collecting Soil, Climate Change InformationABC News Online, 9 November 2006. (pdf 14kB)

Narrandera Community Radio InterviewSpirit FM, 7 November 2006. (wma 26.6MB)

Eye in the Sky Checks Soil Moisture Across Kyeamba ValleyNSW Department of Primary Industry Media Release, 30 October 2006. (pdf 17kB)

Satellites to Track Soil MoistureThe Land, 29 December 2005. (pdf 436kB)

Catchment ResearchManning River Times, 30 November 2005. (pdf 132kB)

Satellite ResearchersNBN News, 23 November 2005. (mpg 43MB)

2UG Interview on NAFE’05, xx November 2005.

Space Technology Hits SconeScone Advocate, Front Page, 17 November 2005. (jpg 588kB)

Weather Prediction Part of ResearchHunter Valley News, 16 November 2005. (jpg 356kB)

World Experts Study Merriwa SoilHunter Valley News, 9 November 2005. (jpg 496kB)

Australian Research Council Annual Report 2004-05, 2005. (pdf 38kB)

Dedicated SMOS Campaign Activities Down UnderESA The Living Planet Programme News, 5 October 2005. (pdf 56kB)

Soil Mapping Project FundedLand and Water News, 27 April 2005. (pdf 25kB)

Funding Boost for Data Rich Remote Soil Water MappingMelbourne UniNews, 14(6), 18 April – 2 May 2005. (pdf 14kB)

Sky No Limit on Soil TestsThe Weekly Times, 30 March 2005. (pdf 167kB)

Water Seekers Awared $1 MillionUniversity of Melbourne Media Release, 17 March 2005. (pdf 15kB)

Research Grants:

  • Walker, J. P., Ge, L., Karmakar, N., Tulbure, M., Ng, B., Preiss, M., Moghaddam, M., Mead, J., 2019: High Resolution Airborne P-band Radar for Environmental Research, ARC Linkage Infrastructure, Equipment and Facilities, LE190100045, AU$741k + AU$380.
  • Wong, V., Wu, X., Walker, J. P., Micklethwaite, S., Reef, R., 2018: Rapid Mapping Technologies for Precision Agriculture, Eng-Sci Seed Grant, Monash University, AU$30k.
  • Kodikara, J., Walker, J. P., Sanjayan, J., Vu, L. H., Setunge, S., Wallace, M., Chiu, W., Nikraz, H., Dhanasekar, M., Bouazza, A., Shahin, M., Gallage, C. P. K., Kulkarni, A., Bui, H. H., Coxon, S., Rajeev, P., Albrecht, D., Lu, Y., Giustozzi, F., White, G., Fang, Y., Robert, D., Zhou, A., Molotnikov, A., Xue, J., Shackleton, M., Yeo, R., Papacostas, A., Denneman, E., Hennessy, G., Boer, G., Tan, J., Kuen, T., Ramanujam, J., Stephenson, G., Zhong, J., Shahkolahi, A., Austin, R., Swifte, B., Gu, H., Yang, X., Scarpas, T., Hoogendoorn, S., Maina, J., Underwood, B., Singh, D., Chabot, A., Henning, T., Sheng, D., Airey, G., Yeaman, J., Carden, Y., Bell, S., Palma, R. S., Sprague, T., 2018-2023: ARC Research Hub for Smart Next Generation Transport Pavements. ARC Industry Transformation Hub IH180100010, AU$4.9M + AU$4M.
  • Wu, X., Walker, J. P., Wong, V., Zhao, X., 2018: Smart Irrigation: Proximal Soil Moisture Sensing for Real-Time Water Delivery Control . MI Seed Grant, Monash University, AU$45k.
  • Micklethwaite, S., Walker, J. P., Clarke, R., Tapper, N., Sullivan, L., Drummond, T., McClusky, S., Murshed, M., Lu, G., Dahlhaus, P., Florentine, S., PopStefanija, I., Rawling, T., 2018: Unmanned Aerial Vehicle Sensing and Data Discovery for a Changing Planet. ARC Linkage Infrastructure, Equipment and Facilities, LE180100058, AU$660k + AU$575k.
  • Walker, J. P., Yeo, I., Jackson, T., Kerr, Y., Kim, E., McGrath, A., 2017-2022: Towards P-band Soil Moisture Sensing from Space. ARC Discovery, DP170102373, AU$924k.
  • Pauwels, V., Walker, J. P., 2017-2020: Improving Flood Forecast Skill Using Remote Sensing Data. Bushfire and Natural Hazards CRC, AU$747k.
  • Walker, J. P., Barca, J., Karmakar, N., Petitjean, F., 2017: Unmanned Aerial Vehicle (UAV) Based Mapping of Crop Water Stress. MI Seed Grant, AU$49k.
  • Walker, J. P., Beringer, J., Rudiger, C., Daly, E., 2017-2018:  Validation of Global Water and Energy Balance Monitoring in the Australian Murray-Darling Basin Using GCOM-W1 Data, 1st Research Announcement on the Earth Observations Product Development Research, GCOM-W Algorithm Development, GCOM-W Calibration & Validation, AU$191k.
  • Colliander, A., Burgin, M., Dinnat, E., Cosh, M. H., Chae, C., Walker, J. P., 2017-2020: Intercalibration of Low Frequency Brightness Temperature Measurements for Long Term Soil Moisture Record, Satellite Calibration Interconsistency Studies, NASA NRA NNH15ZDA001N, US$460k.
  • Zhan, X., Fang, L., Walker, J. P., 2016-2018: Developing and Assessing Algorithms of Downscaling SMAP Radiometer Observations for High Resolution Soil Moisture Data Products, NASA NRA 15-SUSMAP15-0203, US$330k.
  • Maggioni, V., Houser, P., Walker, J. P., 2016-2018: Hyper-Resolution Hydrologic Modeling Enabled by SMAP Observations, NASA NRA 15-SUSMAP15-0203, US$280k.
  • Walker, J. P., Seed, A., Uijlenhoet, R., 2016-2018: Improved Rainfall Measurement Using Mobile Phone Tower Link Attenuation. ARC Discovery, DP160101377, AU$540k
  • Daly, E., Lu, C., McGeoch, M., Tapper, N., Walker, J. P., Salmi, B., Keenan, M., Gooding, M., 2015-2018: Preserving Vegetation Health and Biodiversity of Natural, Urban Reserves. ARC Linkage, LP150100901, AU$188k + AU$60k
  • Walker, J. P., Rudiger, C., Karmakar, N., Hacker, J., Lucas, R., 2015: A Multi-frequency Microwave Radiometer System for Environmental Research. ARC Linkage Infrastructure, Equipment and Facilities, LE150100047, AU$540k + $350k
  • Monerris, S., Rudiger, C., Camps-Carmona, A., Alonso-Arroyo, A., Walker, J. P., 2014-2016: On-the-go Soil Moisture Monitoring from GPS Signals During Routine Farming Operations. Grains Research Development Coorporation, AU$150k
  • Cook, P., Swearer, S., Reich, P., Walker, J., Beardall, J., Cartwright, I., Mainville, D., Moulden, B., Adams, H., McCowan, A., 2014-2017: Linking Flow, Nutrients, Seagrass and Fish: An Integrated Approach to Estuary Management. ARC Linkage, LP140100087, AU$737k + AU$600k
  • Daly, E., Rudiger, C., Webb, J., Beringer, J., Walker, J., Dresel, P., Morse-McNabb, E., Camporese, M., 2014-2017: Catchment Water Balance and CO2 Fluxes: A Comparison Between Productive Land Uses. ARC Linkage, LP140100871, AU$186k + AU$60k
  • Walker, J., Rudiger, C., Beringer, J., Daly, E., Merlin, O., 2014-2017: Validation of Global Water and Energy Balance Monitoring in the Australian Murray-Darling Basin Using GCOM-W1 Data. Global Change Observation Mission: Fifth Research Announcement GCOM-W1, AU$263k
  • Pauwells, V., Walker, J., 2014: On-line Murrumbidgee Catchment Soil Moisture Content Data to Aid Local Farmers. Community Partnerships, AU$5k
  • Walker, J., Rudiger, C., Jackson, T., Entekhabi, D., DeJeu, R., Merlin, O., Kim, E., Renzullo, L., 2014-2016: MoistureMonitor: A Multi-mission Soil Moisture Monitoring System for a Water Limited Future. ARC Discovery, DP140100572, AU$548k
  • Pauwells, V., Walker, J., 2014-2017: Improving Flood Forecasting Skill Using Remote Sensing Data. BFNH CRC, AU$960k
  • Walker, J., 2013-2017: Calibration and Validation of SMAP in Australia. NASA Program Announcement Number NNH12ZDA001N-SMAP, AU$32k
  • Moran, D., Karszenbaum, H., Labbassi, K., Er-Raji, A., Moreno, J., Orr, B., Walker, J., Menenti, M., Vekerdy, Z., and Ghedira, H., 2013-2017: Interfacing the SMAP Cal/Val and Applications Plans, NASA Program Announcement Number NNH12ZDA001N-SMAP, US$84k
  • Walker, J., Deletic, A., Beringer, J., Siems, S., Sherwood, S., McCabe, M., Western, A., Moran, W., Gray, D., and Lambert, M., 2013: Mobile Weather Radar System for Advanced Environmental Monitoring and Modelling. ARC Linkage Infrastructure, Equipment and Facilities, LE130100136, AU$340k + AU$400k
  • Monerris, A. and Walker, J. 2013: Combined use of Global Navigation Satellite Systems and L-band Microwave Radiometry Data for Earth observation. Engioneering Seed Funding, Monash University, AU$15k
  • Rudiger, C. and Walker, J., 2013: The Driving Force Behind Bushfires: Observing Live Fuel Moisture Content of Evergreen Forests. Engineering Seed Funding, Monash University, AU$15k
  • Rudiger, C. and Walker, J., 2012: Monitoring of Above-ground Vegetation Biomass Using Multi-spectral Observations. Engineering Seed Funding, Monash University, AU$14k
  • Pauwells, V., Verhoest, N., Lievens, H., Guingla, van den Berg, De Lannoy, G., Kerr, Y., Al Bitar, M., Merlin, O., Gascoin, Rivalland, Cabot, F., Wood, E., Pan, Sahoo, Walker, J., 2012-2013: SMOS + Hydrology Study. ESA, $240k
  • Walker, J., Rudiger, C., Western, A., Ryu, D., and Gray, D., 2012: The Murrumbidgee Core Validation Site for SMAP, NASA Dear Colleague Letter — Data Only.
  • Walker, J., 2011-2014: Streamflow Forecasting. CSIRO, AU$105k
  • Walker, J., Beringer, J., Rudiger, C., Daly, E., 2011-2014: Towards global water and energy balance monitoring using GCOM-W1 in the Australian Murray-Darling basin. Global Change Observation Mission: Third Research Announcement GCOM-W1, AU$229k
  • Western, A., Ryu, D., Walker, J., Elliott, J., Leahy, C., Crow, W., Wang, Q., Pagano, T., Renzullo, L., 2011-2014: A New Generation Flood Forecasting System Using Observations From Space. ARC Linkage, LP110200520, AU$174k+AU$120
  • Walker, J., Lowell, K., Milne, A., Ge, L., Hacker, J., 2010-2013: Towards Operational Monitoring of Key Climate Parameters From Synthetic Aperture Radar. ARC Super Science Fellowships, FS100100040, AU$557k+AU$120k
  • Walker, J., Panciera, R., Ryu, D. Gray, D., Jackson, T., 2009-2011: Active Passive Microwave Soil Moisture Remote Sensing: Towards Sustainable Land and Water Management From Space. ARC Discovery, DP0984586, AU$540k
  • Walker, J., Pipunic, R., McCabe, M., Abuzar, M., Whitfield, D., 2009-2011: A New Paradigm for Improved Water Resource Management Using Innovative Water Modelling Techniques. ARC Linkage, LP0989441, AU$420k+AU$117k
  • Hacker, J., Beringer, J., Walker, J., Lewis, M., Lynch, M., Hutley, L., Baker, P., Daly, E., Bishop, I, Stewardson, M., Fearns, P., Maier, S., 2009: Airborne Hyperspectral Scanning for Advanced Monitoring and Assessment of Vegetation and Water Properties.. ARC Linkage Infrastructure, Equipment and Facilities, LE0989062, AU$400k+AU$385k
  • Walker, J., Davenport, I., 2009: Towards Improved Soil Moisture Retrieval by LiDAR Measurement of Microwave Properties of Vegetation and Development of a Data Assimilation Framework.. University of Melbourne Joint Research Project, AU$10k
  • Walker, J., Kalma, J., Barrett, D., Gurney, R., Kerr, Y., Kim, E. and LeMarshall, J., 2008-2011: MoistureMap: A Soil Moisture Monitoring, Prediction and Reporting System for Sustainable Land and Water Management. ARC Discovery, DP0879212, AU$910k
  • Walker, J., Moran, W., Hacker, J., Simmons, C., Gray, D., Lynch, M. and Ge, L., 2008: High Resolution Airborne Radar for Environmental Research: Soil Moisture, Vegetation, Salinity and Terrain Mapping. ARC Linkage, Infrastructure, Equipment and Facilities, LE0882509, AU$400k + AU$440k
  • Stewardson, M., Wealands, S., Walker, J., Downes, B. and Hacker, J., 2008: Potential Applications for Airborne Remote Sensed Data. MDBC, AU$30k
  • Walker, J., and Western, A., 2007: The Murrumbidgee Monitoring Network. ARCNESS, AU$15k
  • Deehan, R., Hume, I., O’Neill, P., Walker, J., 2007: Improving the Airborne Mapping of Soil Moisture, E H Graham Centre for Agricultural Innovation, New Initiative Grant Scheme, AU$8k
  • Western, A. W., Tyler, M. H. and Walker, J. P., 2007-2009: Quantifying Near-surface Diffuse Discharge from the Southwest Great Artesian Basin, ARC Linkage, LP0774814, AU$297k+AU$160k
  • Thyer, M., Kuczera, G. and Walker, J. P., 2006-2007: Advanced Algorithms to Retrieve Remotely Sensed Soil Moisture and Enhance Hydrological Prediction, University of Newcastle Pilot Grant, AU$20.5k
  • Zhan, X., Reynolds, C., Houser, P. R., Doorn, B. and Walker, J. P., 2006-2008: Integrate NASA’s Global Soil Moisture Remote Sensing and Modeling Data into USDA’s Global Crop Production Decision Support System. NASA CAN-NN-H-04-Z-YO-010-C, US$493k.
  • Walker, J. P., Kalma, J, D. and Kim E. 2005-2007: High Resolution Mapping of Surface and Root Zone Soil Moisture, ARC Discovery, DP0557543, AU$667k.
  • Dare, P. M., Hacker, J. M., Walker, J. P., Jones, S. D., Kalma, J. D. and Lewis, M. M. 2005: Airborne Laser Scanning for Advanced Environmental Monitoring, ARC Linkage, Infrastructure, Equipment and Facilities, LE0560930, AU$168k + AU$170k.
  • Halbert, C. S., Pitman, A. J., Walker, J. P., et al. 2005-2010: The Earth System Science Network, ARC Networks, AU$1,950k.
  • Walker, J. P., and Trudinger, C. M. 2005-2006: Assimilation of Latent and Sensible Heat Flux Data into the CSIRO Biosphere Model. CSIRO Collaborative Grant, The University of Melbourne, AU$53k.
  • Walker, J. P., Grayson, R. B. and Parslow, J. S. 2004-2005: On the use of Remote Sensing Data in Bio-geo-chemical Marine Models. CSIRO Collaborative Grant, The University of Melbourne, AU$56k.
  • Halbert, C. S., Pitman, A. J., Walker, J. P., et al. 2004: The Australian climate system network. ARC Networks – Seed funding, AU$20k.
  • Walker, J. P., Grayson, R. B., Hacker, J. M., Kalma, J. D. and Heron, M. L. 2004: A New Airborne Facility for Environmental, Hydrological, Atmospheric and Oceanic Research: High Resolution Measurement of Soil Moisture, Temperature and Salinity. ARC Linkage, Infrastructure, Equipment and Facilities, LE0453434, AU$395k+AU$262k.
  • Walker, J. P., 2003: Optimal Land Initialisation for Seasonal Climate Prediction: Brightness Temperature Assimilation. Early Career Research Grant, The University of Melbourne, AU$24k.
  • Walker, J. P., 2003: Validation of the AMSR-E Satellite Soil Moisture Product. International Collaborative Research Grant, The University of Melbourne, AU$10k.
  • Walker, J. P., Grayson, R. B. and Rodell, M. 2003-2005: Gravity Changes, Soil Moisture and Data Assimilation. ARC Discovery, DP0343778, AU$277k.
  • Houser, P. R., Ni-Meister, W. and Walker, J. P., 2003-2005: Optimal Land Initialisation for Seasonal Climate Prediction. NASA NRA 01-OES-03, US$240k.
  • Walker, J. P., 2002: Optimal Land Initialisation for Seasonal Climate Prediction: Brightness Temperature Assimilation. Early Career Research Grant, The University of Melbourne, AU$8k.
  • Walker, J. P., 2002: Optimal Land Initialisation for Seasonal Climate Prediction: Soil Moisture Assimilation. International Collaborative Research Grant, The University of Melbourne, AU$10k.
  • Kalma, J. D., Willgoose, G. R., Walker, J. P., Houser, P. R., and Woods, R. A. 2002-2004: Scaling and Assimilation of Soil Moisture and Streamflow. ARC Discovery, DP0209724, AU$235k.
  • Grayson, R. B., Kalma, J. D., Walker, J. P., Abuzar, M., Whitfield, D. M., McAllister, A. and Maskey, R. 2002-2004: Use of Remote Sensing Actual Evapotranspiration Estimates and Water Delivery Data for Assessing Water Use Efficiency in an Irrigated Landscape. ARC Linkage, LP0211929, AU$148k.
  • Koster, R. D., Reichle, R., Reinecker, M., Suarez, M., Walker, J. P., and Houser, P. R., 2002-2004: Assimilation of Satellite Observations of the Land Surface in Support of NASA’s Seasonal-to-Interannual Prediction Project. NASA NRA 00-OES-07, US$540k.
  • Famiglietti, J. S., Houser, P. R., Walker, J. P., Olivera, F. and Rodell, M. 2002-2004: A Catchment-Based Global River Routing Scheme for Climate Models and Assimilation of Streamflow and Altimetry Data. NASA NRA 00-OES-07, US$165k.
  • Houser, P. R., Entin, J. K., Foster, J. L., O’Neill, P. and Walker, J. P., 2002-2004: Global Validation of EOS-AQUA Land Surface Dynamics Using Data Assimilation. NASA NRA 00-OES-03, US$300k.
  • Houser, P. R., Bosilovich, M., Cosgrove, B., Entin, J. K., Walker, J. P., Pan, H. and Mitchell, K. 2001-2003: A Global Land Data Assimilation System (GLDAS). NASA NRA 99-OES-04, US$860k.
  • Walker, J. P., Houser, P. R., Foster, J. L. and Stieglitz, M. 2001-2003: Assimilation of Remotely Sensed Snow Observations into the NSIPP Land Surface Model. NASA NRA 99-OES-04, US$600k.

Research Consultancies:

  • Walker, J. P., and Rudiger, C., 2012: Soil Moisture Monitoring in the HeiHe River Basin. Cold and Arid Region Institute, AU$30k
  • Walker, J. P., Milne, T., Williams, M., and Panciera, R., 2012: Requirements of a SAR Satellite Mission for Monitoring Soil Moisture Over Australia. GARADA, University of New South Wales, AU$50k

Supervision

Postgraduate

Xiaoji Shen (with Dr In-Young Yeo)
P-band soil moisture mapping
2018 to Present

David Bretreger (with Dr In-Young Yeo)
Data assimilation of P-band
2017 to Present

Rahul Raj (with Prof J Adinarayana)
A system approach model for Citrus crop growth prediction ground and remote sensing based information and data assimilation techniques [IITB]
2017 to Present

Nithyapriya Boopathi (with Prof Y.S. Rao)
Towards soil moisture retrieval using P-band radiometer observations [IITB]
2016 to Present

Jaya Pudashine (with A/Prof Valentijn Pauwels)
Rainfall mapping from mobile phone towers [ARC]
2016 to Present

Valentina Marchionni (with Dr Edo Daly)
Preserving vegetation health and biodiversity of natural urban reserves [ARC]
2016 to Present

Yuxi Zhang (with A/Prof Valentijn Pauwels)
Model data assimilation
2016 to Present

Liujun Zhu (with Dr Chris Rudiger)
Radar remote sensing of soil moisture [CSC]
2015 to Present

Sangita Kumari (with Dr RAAJ Ramsankaran)
Modelling glacier stored volume in Eastern Himalayas using remote sensing datasets [IITB]
2015 to Present

Antara Dasgupta (with Dr RAAJ Ramsankaran)
Distributed hydrological modelling through assimilation of remotely sensed data [IITB]
2015 to Present

Ashkan Shokri (with A/Prof Valentijn Pauwels)
Assimilation of GRACE
2015 to 2018

Sabah Sabaghy (with Liugi Renzullo)
Soil moisture downscaling and harmonisation [ARC]
2015 to Present

Muhsiul Hassan (with A/Prof Nemai Karmakar)
Multi-frequency microwave radiometer
2014 to Present

Siyuan Tian (with Dr Paul Tregoning)
Groundwater estimation from GRACE
2014 to 2018

Shuvashis Dey (with A/Prof Nemai Karmakar)
Electromagnetic transduction based chipless RFID sensors for internet of things (IoT)
2014 to 2018

Ashley Wright (with A/Prof Valentijn Pauwels)
Estimating areal rainfall time series using input data reduction, model inversion and data assimilation [BNHCRC]
2013 to 2017

Sandy Peischl (with Dr Dongryeol Ryu and Dr Yann Kerr)
Multi-incidence angle soil moisture retrieval using passive microwave data at L-band
2009 to 2017

Negin Moghaddam (with Dr Chris Rudiger)
Investigation of the subsurface structural behaviour in the Surat Basin using SAR interferometry deformation maps [MRGS]
2013 to 2016

Mohammad Azmi (with Dr Chris Rudiger)
Application of high resolution data sources via data fusion processes in deriving a comprehensive drought index [MRGS] (pdf 3.9Mb)
2012 to 2016

Mei Sun Yee (with Dr Chris Rudiger and Dr Edo Daly)
Remote sensing error assessment for subsequent use in model confrontation [APA]
2012 to 2016

Mahshid Shahrban (with Dr QJ Wang)
On the importance of soil moisture for streamflow forecasting [CSIRO]
2011 to 2016

Ying Gao (with Dr Dongryeol Ryu)
Joint active passive microwave soil moisture retrieval
2011 to 2016

Mohammad Zomorrodi (with A/Prof Nemai Karmakar)
Millimetre wave image-based chipless RFID system
2011 to 2015

Xiaoling Wu (with Dr Chris Rudiger and Dr Rocco Panciera)
Towards medium-resolution soil moisture retrieval from active and passive microwave observations [MRGS]
2011 to 2015

Robert Pipunic (with Dr Andrew Western)
Assessment of multi-sensor data assimilation for improved land surface model heat flux prediction [MRS]
2010 to 2014

Ye Nan (with Dr Dongryeol Ryu and Prof Robert Gurney)
Mixed pixel retrieval of soil moisture from L-band passive microwave observations [MFRS]
2009 to 2014

Ali Ershadi (with Dr Matthew McCabe and Dr Jason Evans)
Evapotranspiration: application, scaling and uncertainty [APAI]
2009 to 2014

Ranmalee Bandara (with Prof Robert Gurney)
Development of a soil hydraulic property estimator
2009 to 2013

Adam Smith (with Dr Andrew Western)
Soil moisture monitoring with ground-based gravity data [ARC-DP]
2008 to 2013

Clara Draper (with Dr Peter Steinle)
Near-surface soil moisture assimilation in NWP [MRS/CRC eWater]
2007 to 2011

Soo See Chai (with Prof Bert Veenendall and Prof Geoff West)
An artificial neural network approach for soil moisture retrieval using passive microwave data
2006 to 2010

Rocco Panciera (with Prof Jetse Kalma and Dr Ed Kim)
Effect of land surface heterogeneity on satellite near-surface soil moisture observations [APA]
2004 to 2009

Manju Hemakumara (with Prof Jetse Kalma and Prof Garry Willgoose)
Aggregation and disaggregation of soil moisture measurements [ARC-DP]
2003 to 2007

Christoph Rudiger (with Prof Jetse Kalma and Prof Garry Willgoose)
Streamflow data assimilation for soil moisture prediction [ARC-DP]
2002 to 2006

Mathew Turner (with Prof Rodger Grayson)
Integration of satellite data into water quality models [MRS]
2002 to 2006

Stephen Wealands (with Prof Rodger Grayson)
Spatial understanding of hydrologic processes through remote sensing technologies [APA]
2002 to 2006

Leo Lymburner (with Dr Peter Hairsine and Dr Alex Held)
Mapping riparian vegetation functions using remote sensing and terrain analysis [CRCCH]
2001 to 2005

Staff

Dr. Ashley Wright
2018 to Present

Dr. Adrien Guyot
2017 to Present

Dr. Mei Sun Yee
2017 to Present

Miss Kiri Mason
2016 to Present

Mr Xiao Tan
2016 to 2017

Dr. Paul Fisher
2016 to 2016

Dr. Ying Gao
2015 to Present

Dr. Xiaoling Wu
2014 to Present

Dr. Ye Nan
2014 to Present

Dr. Stefania Grimaldi
2014 to Present

Dr. Yuan Li
2014 to 2018

Dr. Lian He
2013 to 2014

Dr. Gift Dumedah
2011 to 2016

Mr. Frank Winston
2011 to 2016

Dr. Sandra Monerris
2011 to 2016

Dr. Mihai Tanasse
2011 to 2014

Dr. Robert Pipunic
2009 to 2012

Dr. Rocco Panciera
2009 to 2014

Dr. Chris Rudiger
2008 to 2011

Dr. Vadim Kuzmin
2006 to 2008

Dr. Olivier Merlin
2006 to 2007

Mr. Rodger Young
2001 to 2012

Dr. Chaojiao Sun
2000 to 2002

Data Sets

Australian Data Sets

PhD Thesis

 

Estimating Soil Moisture Profile Dynamics From Near-Surface Soil Moisture Measurements and Standard Meteorological Data

by
Jeffrey Phillip Walker (B. Surv. (Hons. I), B. E. (Civil) (Hons. I))

SYNOPSIS

An estimate of the spatial distribution and temporal variation of soil moisture content in the top few metres of the earth’s surface is important for numerous environmental studies. Soil moisture content can be determined from: (i) point measurements; (ii) soil moisture models; and (iii) remote sensing. Only a limited area can be monitored with an adequate spatial and temporal resolution using the point measurement technique, while estimates from distributed soil moisture models are generally poor. This is due to an incomplete knowledge of model physics and the large spatial and temporal variation of soil moisture that results from heterogeneity in soil properties, vegetation and precipitation. Remote sensing can be used to collect spatial data over large areas on a routine basis, providing a capability to make frequent and spatially comprehensive measurements of the near-surface soil moisture content. However this technique is limited by an infrequent satellite repeat time and the shallow depth of the soil moisture measurements, consisting of the top few centimetres at most. These upper few centimetres of the soil are the most exposed to the atmosphere, and their soil moisture content varies rapidly in response to rainfall and evaporation.

This thesis overcomes the limitations of the above approaches for determining soil moisture, by linking a physical model of soil moisture movement in both the vertical and horizontal directions, with a data assimilation technique that uses near-surface soil moisture measurements. In this way, the near-surface soil moisture measurements are interpolated in space and time between satellite overpasses, and extrapolated over the soil profile depth. The point measurements of soil moisture profiles are used for calibration of the soil moisture forecasting model, and ongoing evaluation the soil moisture profile estimation from data assimilation.

To address the poor resolution in time of remote sensing data, a water balance approach is used to model soil moisture during the inter-observation period. Using this approach, the soil moisture hydrologic model is forced using estimates of evapotranspiration and precipitation from standard meteorological data. As observations of the near-surface soil moisture content become available, they are incorporated into the soil moisture model using an assimilation technique. This has required the development of a hydrologic model specifically designed to accept remote sensing data as input. In this thesis, a theoretical model is developed for estimating the satellite observation depth for active microwave observations. Moreover, a procedure is proposed for inferring the soil moisture profile over the observation depth, from active microwave remote sensing observations.

This thesis has compared the Dirichlet boundary condition, hard-updating and Kalman-filtering assimilation schemes for estimation of the soil moisture profile. Conclusions are reached for the efficiency of these assimilation schemes, the depth over which near-surface soil moisture measurements are required, and the effect of updating interval on soil moisture profile estimation. These questions are addressed initially by a one-dimensional Richards equation soil moisture forecasting model using synthetic data. The study has shown that the Kalman-filter is superior to the hard-updating and Dirichlet boundary condition assimilation schemes. It is has also shown that the observation depth did not have a significant effect on improving the soil moisture profile estimation when using the Kalman-filter assimilation scheme. Moreover, the Kalman-filter was less susceptible to unstable updates if volumetric soil moisture was modelled as the dependent state, rather than matric head.

While suitable for the one-dimensional problem, the Richards equation model was too computationally demanding for the distributed catchment application. Hence, a computationally efficient distributed soil moisture forecasting model for both vertical and lateral redistribution of soil moisture content, based on a conceptualisation of the Buckingham-Darcy equation, was developed. Moreover, the Kalman-filter assimilation scheme was too computationally demanding for forecasting of the model covariance matrix in a spatial application. To overcome this computational burden, a Modified Kalman-filter was developed, which forecast the model covariance matrix using a dynamics simplification approach.

Both the distributed soil moisture forecasting model and the Modified Kalman-filter have been applied to a field application at the “Nerrigundah” experimental catchment. While an application of the one-dimensional version of this simplified soil moisture model has evaluated the vertical redistribution component, the catchment application has evaluated the lateral redistribution component. Moreover, the usefulness of near-surface soil moisture measurements for updating of soil moisture models to improve the prediction of soil moisture content over the soil profile has been illustrated, showing that an improved estimate of the soil moisture profile was achieved.

Power Point Presentation of Dissertation

You may freely download the following  files of the thesis:

Preface (pdf 332kB) Chapter 5 (pdf 293kB) Chapter 10* (pdf 922kB) Appendix B* (pdf 2347kB)
Chapter 1 (pdf 88kB) Chapter 6* (pdf 2983kB) Chapter 11* (pdf 453kB) Appendix C (pdf 1451kB)
Chapter 2 (pdf 6190kB) Chapter 7* (pdf 763kB) Chapter 12 (pdf 96kB) Appendix D (pdf 166kB)
Chapter 3* (pdf 396kB) Chapter 8* (pdf 1444kB) References (pdf 178kB) Appendix E (pdf 237kB)
Chapter 4 (pdf 1553kB) Chapter 9* (pdf 31577kB) Appendix A (pdf 311kB) Appendix F (pdf 3061kB)

* These pdf files contain non-perfect reproductions of some figures.

Curriculum Vitae

Education

1996 – 1999 : Doctor of Philosophy

Work was commenced on my PhD in March 1996 at the Department of Civil, Surveying and Environmental Engineering, The University of Newcastle, Australia. The topic of my PhD was Estimating Soil Moisture Profile Dynamics From Near-Surface Soil Moisture Measurements and Standard Meteorological Data. This research was supervised by Associate Professor Garry Willgoose and Professor Jetse Kalma. My thesis was submitted for examination in June 1999 and accepted without change in February 2000.

Soil moisture varies in both time and space as a function of atmospheric forcing, soil properties and topography. Model estimates of this variation in soil moisture are often poor due to inherent model errors and an inaccurate knowledge of model inputs. Soil moisture measurements may be made at discrete points, but they are not always representative of the spatial variation in soil moisture. Remote sensing observations provide information on soil moisture in a thin surface layer at discrete times, but do not provide any information on soil moisture with depth. To overcome these shortcomings, an effective soil moisture monitoring scheme must utilise: (i) point measurements for model calibration and evaluation; and (ii) remote sensing observations for updating of the model to overcome the effects of model error and model input inadequacies.

This research investigated the effectiveness of the soil moisture monitoring scheme outlined above. In order to achieve this, it was required to develop an appropriate distributed soil moisture model for soil moisture forecasting, and to collect appropriate data for model calibration, evaluation and updating. Research efforts were focused on the following issues: (i) measurement of surface soil moisture from remote sensing; (ii) estimation of the satellite observation depth; (iii) techniques for assimilation of surface observations into the hydrologic model; (iv) importance of increasing the satellite observation depth on profile retrieval; (v) required frequency of surface observations to keep the model on-track; and (vi) the necessity for accurate model forcing and soil parameter values in such a soil moisture monitoring scheme.

1991 – 1995: Bachelor of Surveying and Bachelor of Engineering (Civil)

During this period individual degrees were completed for both Bachelor of Surveying and Bachelor of Engineering (Civil) at the Department of Civil, Surveying and Environmental Engineering, The University of Newcastle, Australia.

Honours Class 1 and University Medal were obtained for both degrees.

The title of my Honours project was Accuracy of DEMs (Digital Elevation Models). This research investigated the magnitude of elevation errors in published DEMs and the effect these errors may have on potential applications of this data. Of particular interest was the effect of these errors on hydrologic modelling. This investigation involved a Monte-Carlo analysis of geomorphic parameters used in hydrology by making comparisons with an accurate DEM. Hydromorphic parameters investigated include: (i) inferred catchment shape, size and stream network; (ii) width function; (iii) cumulative area diagram; and (iv) slope area diagram.

Honours and Awards:

  • 2019 Fellow of the Institute of Electrical and Electronics Engineers. For contributions to airborne and satellite remote sensing of soil moisture. The IEEE Fellow is one of the most prestigious honors of the IEEE, and is bestowed upon a very limited number of Senior Members who have contributed importantly to the advancement or application of engineering, science and technology bringing significant value to our society. The number of IEEE Fellows elevated in a year is no more than one-tenth of one percent of the total IEEE voting membership.
  • 2017 NASA Group Achievement Award to the SMAP Science Team. For outstanding contributions to the development of NASA SMAP mission and demonstration of its scientific and societal impact.
  • 2016 NASA Group Achievement Award to the SMAP Science and Cal/Val Team. For contribution to the preparation of science algorithm and calibration/validation activities for the Soil Moisture Active Passive Mission.
  • 2014 SSSI Educational Development Award. Conferred on practicing teachers, facilitators or academics who have substantially contributed, through teaching, research, publication or professional activities. It acknowledges leadership not only in empowering students in the use of technologies, but also in supporting other teachers to acquire knowledge and/or promote excellence for practising academics in the fields of surveying and spatial science.
  • 2011 Monash Postgraduate Association Supervisor of the Year. Presented annually to acknowledge and celebrate excellence in research supervision practice. Supervisors are nominated by their postgraduate students and entries are judged by an independent subcommittee of research postgraduates drawn from the MPA Executive Committee.
  • 2009 Inaugural Anton Hales Medal. Recognises distinguished research in the Earth sciences, honouring the contributions to Earth sciences by the late Professor Anton L Hales FAA, the founding director of the Research School of Earth Sciences in the Australian National University.
  • 2006 Best Paper. Awarded by Institution of Engineers Australia to the presenter of the best paper submitted to the Hydrology and Water Resources Symposium.
  • 1995 University Medal in Civil Engineering. Awarded to a graduand who, in addition to achieving Honours, displays ability in the discipline concerned. In assessing eligibility the Medals Committee takes into account the graduand’s record throughout the Bachelor’s degree course, but particular regard is paid to achievement in the final year of study.
  • 1995 University Medal in Surveying. As above.
  • 1995 Deans Medal. Awarded annually to final year students graduating with a weighted average mark in excess of 85.
  • 1995 The Board of Surveyors’ Medal. Awarded annually for outstanding performance, if of sufficient merit, in the final year of the Bachelor of Surveying degree course.
  • 1995 The ACSE Prize in Structural Engineering. Awarded annually to the student enrolled as a candidate for the degree of Bachelor of Engineering who achieves the best performance, if of sufficient merit, in the structural design component of the fourth year Civil Engineering Design subject.
  • 1995 The Consulting Surveyors New South Wales Prize in Land Studies. Awarded annually to the student achieving the best performance, if of sufficient merit, in the field of Land Studies in the Bachelor of Surveying degree course.
  • 1995 The Hunter Water Corporation Achievement Award. Awarded annually to the student undertaking the course leading to the degree of Bachelor of Engineering specialising in the area of Civil Engineering who, in completing the subjects in the field of Hydraulics and Water Resources Engineering, achieves the best in completing the subjects in the field of Hydraulics and Water Resources Engineering and achieves the best overall performance, if of sufficient merit.
  • 1995 The Institution of Engineers Australia Civil and Structural Branch Prize in Civil Engineering. Awarded annually to the Bachelor of Engineering (Civil) graduate who achieved the best overall performance, if of sufficient merit, in the final year of the course.
  • 1995 The Institution of Surveyors Australia Hunter-Manning Group Prize in Surveying. Awarded annually for the best performance, if of sufficient merit, in the final year of the Bachelor of Surveying course.
  • 1995 The James Hardie Pipelines Water Resources Engineering Prize. Awarded annually to the student undertaking the degree of Bachelor of Engineering, specialising in the area of Civil Engineering who, in completing the subjects in the field of Water Resources Engineering achieves the best overall performance, if of sufficient merit.
  • 1995 The Peter Kleeman Medallion. Awarded annually to the graduate in the Bachelor of Engineering (Civil) who has achieved the best overall academic performance over the duration of the course in the field of Structural Mechanics.
  • 1995 The Spruson & Ferguson Prize in Civil Engineering. Awarded annually to a candidate for the degree of Bachelor of Engineering (Civil) who submits the most innovative Final Year Project Report, if of sufficient merit.
  • 1995 Mine Subsidence Technological Society Prize in Geotechnical Design. Awarded annually to the student undertaking a bachelor degree course program with the best overall performance, if of sufficient merit in the Geotechnical Design component of the subject CIVL 454 – Civil Engineering Design 2.
  • 1995 The Tony Herzog Award. Awarded to an undergraduate student in the Department of Civil Engineering and Surveying who has submitted a final year project report of outstanding merit.
  • 1995 The Metal Building Manufacturers’ Association Prize. Awarded annually to the student with the best overall performance, if of sufficient merit, in completing the subjects in the field of Structural Design and Engineering, in the third year of the Bachelor of Civil Engineering degree.
  • 1994 The SRIA University Award for Concrete Design. Awarded annually to the student with the best performance, if of sufficient merit, in the subject, Reinforced Concrete Design.
  • 1993 The Astley Pulver Prize for Second Year Surveyors. Awarded for the best Performance, if of sufficient merit, in the subjects dealing with surveying topics in the second year of the Bachelor of Surveying degree.
  • 1992 The BHP Rod & Bar Products Division Prize in Civil Engineering. Awarded annually for the greatest proficiency, if of sufficient merit in the second year of the Bachelor of Civil Engineering degree.

Research Interests

My primary research ambition is to lead programs in socially relevant research that will have a positive impact on the way we take care of the environment so as to result in an improved quality of life both now and in the generations to come. I believe that the key to this is through improved earth system state and flux monitoring, prediction and reporting, in a way that is relevant to policy and decision making processes, flood and drought prediction and assessment, land and water management, national weather and climate forecasting, etc. My vision is that this goal will be realised through a combination of i) environmental sensing, ii) earth system modelling, and iii) optimal convergence of model predictions with observations through data assimilation. This is a new area of research that has gained wide spread interest over the past years.

Professional Experience

Research Grants

See Research Grants tab for listing.

Publications

See Publications tab for listing.

Professional Affiliations

  • Institution Engineers Australia, Fellow, CPEng, EngExec
  • Institution of Electrical and Electronic Engineers, Fellow
  • Modelling and Simulation Society, Member
  • American Geophysical Union, Member

Employment History

2012 – Present: Professor and Head, Department of Civil Engineering – Monash University

I am currently employed as a Professor and Head of the Department of Civil Engineering, Monash University, Australia.

2017 – 2018: Interim Dean, Faculty of Engineering, Monash University

Employed as the Interim Dean  of the Faculty of Engineering, Monash University, Australia.

2010 – 2011: Professor – Monash University

Employed as a Professor in the Department of Civil Engineering, Monash University, Australia. I am managing a number of research projects in addition to teaching.

2007 – 2010: Associate Professor and Reader – The University of Melbourne

Employed as an Associate Professor and Reader in the Department of Civil and Environmental Engineering, The University of Melbourne, Australia. During that period I managed a number of research projects in addition to teaching.

2003 – 2006: Senior Lecturer – The University of Melbourne

Employed as a Senior Lecturer in the Department of Civil and Environmental Engineering, The University of Melbourne, Australia. During that period I managed a number of research projects in addition to teaching.

2001 – 2003: Lecturer – The University of Melbourne

Employed as a Lecturer in the Department of Civil and Environmental Engineering, The University of Melbourne, Australia. During that period I managed a number of research projects in addition to teaching.

1999 – 2001: Research Scientist – NASA Goddard Space Flight Center

During this period I was employed in a research scientist position at NASA‘s Goddard Space Flight Center, firstly with USRA (Universities Space Research Association) as part of the Goddard Visiting Scientist Program (GVSP) and then with the University of Maryland Baltimore County (UMBC) as part of the Goddard Earth Sciences and Technology (GEST) Center. The main project I worked on was entitled Optimal Land Initialisation for Seasonal Climate Prediction and sought to provide optimal initialisation of the NSIPP (NASA Seasonal to Interanual Prediction Project) land surface model, through assimilation of near-surface soil moisture observations into the land surface model. In addition, I was the PI on a project entitled Assimilation of Remotely Sensed Snow Observations into the NSIPP Land Surface Model and Co-I on a project entitled A Global Land Data Assimilation Scheme. I also collaborated with the Land Data Assimilation Schemes project.

1996 – 1999: PhD Scholar – The University of Newcastle

During this period I conducted research towards my PhD at the Department of Civil, Surveying and Environmental Engineering, The University of Newcastle, Australia. Details of my doctoral research have been provided above.

1992 – 1996: Marshall Scott – Surveying and Land Development Consultants

During university vacations I was employed by Marshall Scott, Surveying and Land Development Consultants, Cessnock, as an undergraduate Surveyor. Responsibilities included cadastral, topographic, and engineering surveys and design work. Engineering designs included plans of road widening and subdivision layouts. I was also responsible for the preparation of an entire drainage design for a 40 lot subdivision.

1991 – 1992: Monteath and Powys – Consulting Surveyors and Planners

During university vacations I was employed by Monteath and Powys, Consulting Surveyors and Planners, Newcastle, as a Surveyors Assistant. Responsibilities included assisting with cadastral, topographic, hydrographic and engineering surveys. Field work duties included instrument use and general assistance. Office duties included general plan preparation and calculations.

1989 – 1991: Collins, Walshe and Fitzsimmons – Consulting Surveyors and Engineers

During university vacations I was employed by Collins Walshe and Fitzsimmons, Consulting Surveyors and Engineers, Taree, as a Surveyors Assistant. Responsibilities included assisting with cadastral, topographic, and engineering surveys. Field work duties included instrument use and general assistance. Office duties included general plan preparation and calculations.

Personal Interests

  • Rock Climbing
  • Snow Skiing
  • Water Skiing
  • Wind Surfing
  • Motorcycle Riding
  • Leather Craft
  • Woodwork
  • House Renovations

Referees

Details of referees provided upon request

Last modified: February 10, 2019