ESTIMATION OF THE REAL EVAPOTRANSPIRATION WITH REFINEMENT OF THE LANDSAT THERMAL IMAGE BAND - DOI: 10.7127/rbai.v13n301040

Resumo

Irrigated agricultural activity is responsible for large food production, however it is pointed out as the major consumer of water. To compute the real evapotranspiration by means of remote sensing, short-wave images with spatial resolution of 30m x 30m "pixel" (Landsat) are used. While the images with long wave bands (thermal) have a resolution between 60m x 60m and 120m x 120m, which compromise the result. This work proposes the improvement of the spatial resolution of the actual evapotranspiration obtained by energy balance, using the METRIC model, by improving the spatial resolution of the thermal band used. The refinement of the thermal band allows a better visualization and spatialization of evapotranspiration values. Therefore, the refinement of the thermal band is an extremely important tool for the estimation of the real evapotranspiration values in agricultural areas, considerably improving the spatial resolution of the images (up to 16 times), corroborating with activities related to the environmental scope, water resources management and agriculture.