Environmental monitoring

Environmental monitoring


Water monitoring system and weather station

An industry standard water monitoring system and weather station is located on Farrington Pier. Data from remote loggers and associated infrastructure is frequently collected at set time intervals, recorded and stored on the Hobolink system. Water parameters that are recorded include pH, electrical conductivity, temperature, dissolved oxygen and turbidity. Weather parameters that are recorded include temperature, rainfall, barometric pressure, wind speed/direction, relative humidity and lux.

environmental monitoring


HOBOlink is a web-enabled software designed for use with HOBO data loggers and Field Monitoring Systems. The HOBOlink software platform makes it easy to access and view current and historical data, alarm notifications and relay activations, and manage data remotely. All the data collected from the JMR water system and weather station can be viewed on the Hobolink platform. There are 2 public access sites to choose from;

  1. Data Summary site: On this site, you can view data from all of the measured parameters through graphs. You can choose to see the graph for the current day, the past week or the past month.
  2. System Overview site: On this site you can see an overview of the system, see graphs similar to those in the Data Summary site, you can also view logs, data files and export files. You can see more history in this version through the Exports section but it isn't graphed, it is presented in a spreadsheet format. You can download files from this site but some of the Export files are very large so they do take some time to download.

Any changes made on either public access site are not permanent, it will reset to default when you close the window.

A note about the date format. Hobolink is a US based company so the date is in US format mm/dd/yyyy.

An important note about the water sampling data

Water sampling in the lake occurs every 5minutes and sampling is periodically switched every 2hrs (approximately) between surface water and deep water, this switching is reflected in the 'Current' readings. A reading of around 20mA (>18.5mA) means water has been sampled from near the surface of the lake and a reading of around 0mA  (<1mA) means deep water has been sampled, around 30cm from the bottom of the lake.

What does this mean for the graphs
The water parameter graphs do not separate these into 2 readings into separate lines, rather, it puts them together in the graph as a single line. It is possible to see if a reading is from the surface of the water or from deep water by looking at the date, times and reading on the 'Current' graph and comparing or overlaying this with the parameter graph of interest.

What does this mean for exported raw data
If you want to graph the data yourself or go back further in time than the graphs allow, you can export the raw data yourself using the System Overview site. The data can be downloaded as an excel file or csv file and columns are expandable to view more information.

The raw data makes it is easier to see what readings have been taken from the surface of the water and which ones have been taken from the deep water. The fourth column of the spreadsheet is the current reading and the value tells you whether deep water or surface water has been sampled.

You will notice a second 'current' column at the very end of the table. Please IGNORE these readings. Despite some of these readings looking similar at times, the last column is a different sensor and IS NOT an indication of what level the water has been sampled.


Now to the good stuff

Find out what you can see on the 2 public access sites;

1. Data Summary site:  So what am I looking at on this site

Hobolink


2. System Overview site: What can I see and do on this site



Just a note: The system isn't perfect and you may see inconsistencies in the data from time to time. Sometimes data might be missing or sensors appear to be stuck on a value for longer than expected. This can be due to a number of things; the system might be getting serviced, sometimes sensors fail and need replacing, sometimes the power goes out and sometimes HOBOlink itself goes down. We do our best to keep the system running as smoothly as possible.

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