Abstract
Potential evapotranspiration is widely used by farmers and hydrologists as a measure for determining actualevapotranspiration for irrigation scheduling, drought monitoring, hydrologic modeling and regional water balance studies.In the present study a comprehensive methodology has been developed for estimating reference crop (Grass) ET usingPenmanMonteith combination equation from Advanced Very High Resolution Radiometer (AVHRR) for Texas at a spatialresolution of 1 km2. As part of this study 282 NOAA14, AVHRR satellite images acquired between May 1999 to August 2000and weather data measured at several weather stations across Texas were analyzed. Regression relationships were developedto calculate the weather parameters maximum air temperature and vapor pressure deficit from satellites infrared surfacetemperature. The regression relationships were validated using independent weather station observations. The root meansquare error (RMSE) of daily ET calculated using these weather parameter estimates was within .1.1 mm day1 whencompared to ET derived from groundbased weather station measurements of climatic variables.
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