Calibrating satellite-based vegetation indices to estimate evapotranspiration and crop coefficients
This paper presents a procedure to estimate actual evapotranspiration (ET) using a satellite-derived vegetation index. Actual ET is computed in a traditional manner using the crop coefficient (Kc) and reference ET (ETref) procedure (i.e., ET = Kc x ETref) with Kc estimated from the satellite-based NDVI. This study calibrated relationships between Kc and NDVI using satellite-based ET determined by surface energy balance. This unique approach enables calibration of the Kc vs NDVI equations using large numbers of sampled fields (in this case, more than 3000). Thus the calibration represents a ...
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