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• 1:32,000. The photograph was analyzed using visual interpretation <br />techniques to detect features which could indicate flood irrigation <br />or sub-irrigation. <br />Interpretive factors used in identifying features included the <br />use of color, teature, location and stereoscopic examination for <br />topographic relief. Descriptions and Locations of features have <br />been made with the photograph oriented so the photo number is <br />positioned is the upper right corner with the top of the photograph <br />pointing north, <br />Color infrared reflectance (CIB) as recorded on this photograph <br />renders a unique color of surface features which differ greatly from <br />• their natural color. A bright red color of CI$ would show up on a <br />natural color photograph as rich green and represents grasses which <br />receive water from irrigation. Other red or orange color in the <br />infrared are naturally green in color but vary in plant vigor, <br />photosynthetic activity, structure (trees, shrubs, grasses), or <br />species composition. The darker green colors in the infrared <br />indicate stands of sagebrush; the difference is due to the increase <br />in the bare ground interapaces in the sagebrush stand. Bare ground <br />along with yellowish-brown features or dry plant material has an <br />infrared reflectance of white. The white linear features are <br />usually dirt roads. Large white areas are bare ridges with very <br />sparse or dry vegetation. Surface water quality with respect to <br />• turbidity has distinct color characteristic a; relatively clear <br />water appears as a black color, while more turbid water is a bluish- <br />2.06-23 <br />