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Using NDVI Sum Approach to Detect <br />Irrigated Lands for Annual ET <br />Estimation <br />•An NDVI threshold approach were used to <br />determine the irrigated lands . <br />•The sum of the NDVI images varied from zero <br />to 8 non dimensional units; the minimum <br />NDVI threshold for irrigated areas was set at <br />1.5. All pixels (30m by 30m) that had an <br />annual NDVI value of 1.5 or more was <br />considered to be irrigated land. <br /> <br />25