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Section 785.19 (c) Continued. red which transects the upper end of the area. Other reddish areas on this and the other two photographs are naturally green in color but vary in plant vigor, photosynthetic activity, structure (trees, shrubs, grasses), or species composition. Again on photograph 360, the darker green areas around the center of the photograph are dense stands of sagebrush, the lighter green areas are less dense stands of sagebrush; the difference being due to the increase in the bare ground interspaces in the sagebrush stand. Bare ground along with yellowish-brown features, or dry plant material has a CIR reflectance of white as seen on the lower left quarter of photograph number 360. Here the white 1lnear features are dirt roads or in some cases, seismic lines which have been denuded of vegetation. Large white areas are bare ridges with very sparce or dry vegetation. u Surface water quality with respect to turbidity has distinct color characteristics. On photograph 360, the relatively clear water in the Canadian River, which traverses the upper half of the photo- graph, appears as a black meandering line while the reservoir in the lower left quarter is a bluish-green indicating a more turbid condition. Highly turbid water shows up as light, robin's egg blue. Photographic texture used for photo-interpretation on vegetated areas is dependent on the size and spatial relationship of the plants. Texture is also dependent on the photographic scale and resolving power of the camera lens and photographic paper on which it is printed. Three textural classes were used to interpret these photographs: fine, fuzzy, and coarse. Since these terms are sub- jective, they must be defined through example. The central portion of the bright red area in the upper right quarter of photo number 358 is fine texture made up of grasses. The upper and lower por- tions have coarse texture made up of trees. The aspen trees on the 785-22