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• roads. Large white areas are bare ridges with very sparse or dry <br />vegetation. Surface water quality with respect to turbidity has <br />distinct color characteristics; relatively clear water appears as a <br />black color, while more turbid water is a bluish-green; highly turbid <br />water shows up as light, robin's egg blue. <br />Photographic texture used for photo-interpretation on vegetated areas <br />depends on the size and spatial relationship of the plants. Texture <br />also depends on the photographic scale and resolving power of the <br />camera lens and photographic paper on which it is printed. Three <br />textural classes are used to interpret infrared photographs: fine, <br />fuzzy, and coarse. <br />Location relative to elevation and drainage features is important in <br />predicting soil conditions and associated vegetation. Within <br />floodplains, even slightly elevated land may support different plant <br />communities than that of the surrounding plain. Using a stereoscope <br />• to achieve a three-dimensional view of the subject area the <br />interpreter is able to make elevation determinations. At the scale of <br />these photographs, three dimensional relief can be detected for <br />objects such as trees of about 6 to 8 feet in height. Channels in <br />drainage bottoms with an elevation difference of 2 to 3 feet can be <br />detected. <br />The floodplain Middle Creek appears in the infrared as a reddish-green <br />area. Irrigation ditches are visible in the green colored hillslopes <br />surrounding the floodplain in the south and east edges, and on the <br />hillock protruding into the floodplain between two streams. There is <br />a conspicuous absence of trees on the floodplain, even on the <br />streambanks. Grazing activity is evident in some parts of the <br />floodplain, which shows on the infrared photograph as a lighter green <br />and pink color near the protruding hillock in the floodplain. <br />C~ <br />2.06-19 <br />