GOES Evapotranspiration and Drought (GET-D) products are derived from the Atmosphere-Land Exchange Inversion model (ALEXI). ALEXI computes principle surface energy fluxes, including Evapotranspiration (ET), which is a critical boundary condition to weather and hydrologic modeling, and a quantity required for regional water resource management. ALEXI ET estimates have been rigorously evaluated in comparison with ground-based data, and perform well over a range in climatic and vegetation conditions.
The GET-D system is designed to generate ET and drought maps operationally. ALEXI ET is retrieved over clear-sky pixels daily and ALEXI drought product is generated over 1 to 6 month compositing periods each day.