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DIVISION 2 MEMORANDUM <br />this data is shown in Figure 1.0. DOQQ imagery from USGS was chosen for its high resolution and <br />spatial accuracy, which provides a superior base for mapping irrigated parcels and related characteristics. <br />In addition to the 71 USGS DOQQs acquired for this project, CWCB shared the cost with USGS for <br />updating another 76 DOQQs. The Division 2 Office also supplied an additional 72 DOQQS for the <br />project. The sources of data used to construct the image base map are described in Figure 2.0 and Table <br />6.0. The source dates of the imagery used for this image database range from 1993 to 2001, with the <br />majority of images from 1998. <br />Page 7 of 23 (Riverside Technology, Inc. <br />( Water Resources Engineering and Consulting <br />Figure 1.0 Example of DOQQ Used to Compile Image Base Map <br />in the Lower Arkansas River Basin <br />