**Step 6: Retrieval of evapotranspiration (ETp) via Land Surface Analysis –Satellite Applica‐ tion Facility (LSA SAF) ETp product**

The crop coefficient is defined as the ratio of crop evapotranspiration, ETr, to reference evapotranspiration, ETp. Kc is crop specific and ranges from zero to over unity, depending on the crop growth stage. Crop evapotranspiration at any time during the growing season is the product of reference evapotranspiration and the crop coefficient.

ETr = ETp\* Kc Crop coefficients was developed for nearly all crops by measuring crop water use with lysimeters and dividing the crop water use by reference evapotranspiration for each day during the growing season of 2009/2010 [50].

The recent development of LSA–SAF products has allowed us to obtain frequent and accurate measurements of a number of basic agrometeorological parameters (e.g. surface albedo, surface temperature, evapotranspiration). The satellite estimated agrometeorological param‐ eters have several advantages compared to conventional measurements of agrometeorological data in ground meteorological network.
