WaterWatch, together with partners, has developed the SEBAL algorithm, which stands for Surface Energy Balance Algorithm for Land. Both actual and potential evapotranspiration can be calculated on a pixel-by-pixel basis by solving the energy balance at the earth surface using satellite images. Furthermore SEBAL can calculate the biomass production and soil moisture in the root zone. SEBAL requires spatially distributed, visible, near-infrared and thermal infrared data which can be taken from e.g. Landsat ETM, ASTER, NOAA or MODIS.
Please visit our projects site for examples of SEBAL applications.
To read more about the technology, please also visit the item “Water Watchers” on the Earth Observatory website.