Evapotranspiration (ETo and ETc) Workflow

Evapotranspiration is calculated using the FAO Penman-Monteith method with sensor measurements of air temperature, humidity, wind speed and solar radiation. In conjunction with Eratos, ICT International has developed an Evapotranspiration Workflow for the real-time integration of these measurements for online visualisation.

All processing of the incoming sensor data is performed within the Eratos platform, with the Penman-Monteith calculation applied. Data can be displayed alongside other sensor inputs to provide a whole ecosystem approach to analysis.

Why measure evapotranspiration?

Evapotranspiration measures the amount of water lost over a period of time by an area covered by crops (ETc) or a reference grass area (ETo). For over 30 years, the FAO has adopted the Penman-Monteith calculation as the preferred methodology for the calculation of al forms of evapotranspiration. Using this robust and reliable method, ICT International has applied the Penman-Monteith calculation to IoT enabled sensor data. This enables near real-time data to be collected for analysis, in conjunction with multiple sensor data inputs, visualised for decision making or subsequent analysis.

The workflow is compatible with the following sensors:

• SNiP-AWS5L with Pyranometer for solar radiation
• SNiP-MCS with ATH2S for temperature and humidity, AWS200 weather station for wind speed, and pyranometer.

Both these are available with LoRaWAN or NB-IoT connectivity for Internet of Things connection options.

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