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ETa estimated using ReSET and <br />other reflectance (VI) based models <br />Other model 1: Reflectance-based crop coefficient (grass ref.), kcbo. <br />Kcbo=1.13 x fc+0.14, fc= 1.22 x NDVI - 0.21. <br /> <br /> ETa = Kcbo x ETo <br /> Other model 2: Reflectance-based crop coefficient (alfalfa ref.), Kcr1: Kcr1=1.184 x NDVI - 0.026 ETa = Kcr1 x ETr <br /> <br />Other model 3: Reflectance-based crop coefficient (alfalfa ref.), Kcr2: <br />Kcr2=1.416 x SAVI + 0.017 <br /> ETa = Kcr2 x ETr <br /> <br /> <br /> <br /> 16