EVASPA – EVapotranspiration Assessment from SPAce

EVASPA provides daily time series of evapotranspiration, on irrigated or non-irrigated agricultural areas, at high resolution (less than 100 m).

Using thermal imagery (TIR), the cartographies rely on maps combining surface temperature, vegetation index and albedo within several surface energy balance models. They are compatible with large-scale applications (large irrigated perimeter, watersheds larger than 500 km², aquifer right-of-way, etc.) as well as with agronomic applications (crop water requirements, irrigation management, pumping estimates, etc.). ■

SAMIR – SAtellite Monitoring of IRrigation

SAMIR is a tool simulating the water balance of irrigated and non-irrigated agricultural areas at high resolution (Sentinel-2, Landsat). It estimates daily evapotranspiration using the FAO-56 method with forcing of vegetation characteristics from vegetation index (NDVI) time series and using daily meteorological data. Irrigation water inputs are simulated using assumptions about farmers’ practices (soil moisture threshold for triggering, doses, wet soil fraction, etc.).

This tool enables monitoring of the water balance on the scale of irrigated perimeters as well as estimates of pumping in aquifers. It is of particular interest to irrigation or watershed managers.

SAMIR has been developed within the framework of a collaboration between IRD (UMR CESBIO) and the University of Marrakech (www.lmi-trema.ma). The approach is currently being integrated into the MODSPA modelling platform developed at CESBIO. ■

SAT-IRR – SATellite IRRigation Scheduling

SAT-IRR is an irrigation advisory tool for farmers.

At agricultural plot scale, it allows to translate evapotranspiration, simulated by a water balance model of the same type as SAMIR (FAO and NDVI), into soil moisture and irrigation date and irrigation depth to be applied.

SAT-IRR is available online ■