Presenting a simple equation to determine the reference evapotranspiration using NOAA satellite data

Document Type : Research Paper


Graduated master science


Accurate estimation of reference evapotranspiration (ETo) is needed for water resources management, farm irrigation scheduling, and environmental assessment. A large number of methods have been developed for assessing ETo from meteorological data. However, most weather stations around the globe are located in nonagricultural settlings of dry, bare soil surface and/or concrete surfaces. Using these weather data may cause serious errors. Satellite images on the other hand cover large cultivated areas and fields. Throughout the present study, Penman–Monteith equation was converted to a simple equation of three components for each component of which there was a linear regression presented with satellite input data. To create and test regression equations, 297 NOAA- AVHRR satellite images for duration of ten years were acquired. The present investigation has been carried out in Amirkabir irrigated unit in Khuzestan province. The results indicate that the simplified equation can estimate ETo with an R2 of 0.92 and an error of 8 percent. 


Main Subjects

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