عنوان مقاله [English]
نویسندگان [English]چکیده [English]
Proper estimation of crop water requirement is vitally important to maintain sustain crop production in arid regions, where water shortage is challenging. The aim of this study was to estimate actual evapotranspiration (ETa) of crops in Qazvin plain, Iran using satellite images and METRIC algorithm. In this regard,the obtained values of ETa by METRIC algorithm using the images of Terra satellite MODIS sensor and Landsat 7 satellite ETM+ sensor, were compared with lysimeteric measurements Results of the statistical comparisons showed that Landsat 7 ETM+ sensor with correlation coefficient of r=1.00, RMSE=0.91 mm day-1 and MAE=0.10 mm day-1 and Standard Error (SE) =0.09 mm day-1 had more acceptable agreement with measured data comparing with those obtained from MODIS sensor and can be recommended as the preferred option in the region.