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DIVISION 2 MEMORANDUM <br />Figure 7.0 Comparison between (a) an Uncorrected and (b) a Radiometrically Corrected <br />Landsat TM Image <br />2.7 Image Subset for Study Area <br />The subset procedure consisted of `cutting' the satellite images to the approximate boundaries of the <br />2003 Irrigated Lands Update In The Lower Arkansas River Basin study area. In the first step of this <br />procedure, Area of Interest (AOI) polygons were delineated along the extents of the DOQQ map base for <br />each Landsat frame. In a second step, the AOI polygons were used in ERDAS Imagine to create subsets <br />of all Landsat scenes. The objective of the image subset was to reduce the amount of data handling and <br />processing time. <br />Page 17 of 23 (Riverside Technology, inc. <br />Waler Resources Engineering and Consulting <br />(b) Radiometrically corrected Landsat TM in <br />near infrared band combination (4 -3 -2) <br />(a) Uncorrected Landsat TM in near infrared <br />band combination (4 -3 -2) <br />