Abstract
Evapotranspiration estimations are essential in irrigation schemes, reservoir water losses, water balance computations, runoff predictions, and meteorology and climatology studies. The new techniques called remote sensing and geographical information systems (GIS), allow a spatially distributed calculation of this parameter. A new rational model, SEBAL ( Bastiaanssen, 1995), based on the energy balance equation, has been applied in this study. In this model, a lower number of empirical relations is needed. Besides of this, the SEBAL model has many other advantages. This model has been calibrated and validated in an area located in the Guadalquivir Valley (Spain), from a satellite image Landsat-TM5 and climatology data. Afterwards, the model was used in a smaller resolution than the original one, through an aggregation procedure of the original TM image. This resolution change was made to check the possible use of others type of satellite images. Crops, soils and digital elevation model maps of the study area have been included for studying some of the parameters obtained in the previous determination of the ET.
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