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~ ~ acquire both of these variables is in October. This will allow for the development of a base map with a minimum water component and maximum vegetation. The photography will be flown at an approximate scale of 1:12,000 with a 30% side lap and a 60% forward lap. Photography will include a ,1 kilometer buffer on both sides of the river. Color aerial videography will be acquired at peak flow and again at base flow. A PC-based map and image processing system (MIPS) will be used to delineate the same classes identified with the CIR. The results will then be transferred to a GIS for incorporation to the relational data base. The study area will be paneled with each panel geographically referenced using two Global Positioning System units. This will allow for proper map registration and scale determination. The panels will remain in place until all photography and videography has been obtained and then removed, The aerial photographs will be interpreted for the following features: Main channel (open water) Side channel (open water) Backwaters Sandbars Vegetation (several classifications) Submerged Bottomlands Dikes/Canals/Control Features Land Use Field verification will be required to familiarize the photo interpreter with target characteristics. A second trip will be required to verify the results. After the second field yerification the results will be transferred to a mylar base map and digitized into the GIS. Subsequently, all features will be labeled with areas and perimeters calculated. Service biologists will conduct two reconnaissance trips to set up study sites where detailed habitat measurements will be made by individuals on the ground at the same time as the aerial videography is flown (peak and base flows). The selected study sites will represent the general habitat conditions found in the Colorado River as well as specific sites known to be important to Colorado squawfish, humpback chub and razorback sucker. Habitat types that can not be identified directly from the photographs (e.g. eddies, runs, riffles, and popls) will be drawn on photographs from prior trips to allow quantification of these specific habitat types. Number and area of each habitat type will be calculated for each flight. A search will be conducted for existing data bases such as soils, geology, and ownership. Topography will be either obtained as OEM files from the U.S.G.S. or digitized from U.S.G.S. 7.5 minute topographic maps. VI. Task Description (FY-1992) 1. Establish control points in the study area with panels and GPS units. (BR) 2. Acquire aerial CIR of the study area. (BR) 3