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Using NDVI Sum Approach to Detect <br />Irrigated Lands for Annual ET <br />Estimation <br />•The NDVI based method for identifying <br />irrigated areas was manually verified and <br />proved to be more accurate and efficient than <br />manually digitize polygons of irrigated area <br />since irrigated fields boundaries changes every <br />year and even during the same year. <br /> <br /> <br />26