Estimation of Regional Scale Evapotranspiration Through Analysis of Satellite Thermal-infrared Data

Since the mid 70´s the LANDSAT series of satelites has acquired visible and near-infrared observations of the earth at a frequency and spatial resolution suitable for agriculture assessment purposes. More recently satellite systems have acquired high precision thermalinfrared data relating to surface thermal properties and moisture status. A data set from the Heat Capacity Mapping Mission [1] illustrates the potential applications of such data for inferring evapotranspiration on a regional scale. Methods described previously [2] are utilized to estimate evapotranspiration rates, yielding results which are consistent with surface measurements of pan evaporation.