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for the 1979 growing season. Shrub density data were also gathered for <br />reference areas during the 1980 growing season. Complete phytosociological <br />( descriptions of these reference areas and of all affected area vegetation <br />types sampled are presented on pages 56-62. <br />VEGEPATION TYPE MAPPING <br />Five distinct mapping units were delineated on a topographic base map <br />at a scale of 1" = 400': <br />1. Mixed brush <br />2. Upland sagebrush <br />3. Aspen (mixed brush subtype) <br />4. Disturbed (including access or haul roads, areas currently <br />being mined or where topsoil and vegetation have been removed) <br />5. Ba_~-ren (naturally devoid of vegetation) <br />Each mapping unit within the approximately 2700 acre study area was <br />delineated on reproducible mylars. Each field sample point was also <br />plotted on the vegetation type distribution map. Ground truthing of <br />type delineations took place during field sampling. For affected areas, <br />each randomly located sample point was transferred to a topographic <br />map by measuring from obvious landmarks. Each sample point thus <br />represented a ground truth location and allvaed efficient and accurate <br />field ground truthing of affected area type delineations. Ground <br />truthing of type delineations over the rest of the study area was <br />accomplished by field spot checking at selected locations. Once the <br />preliminary vegetation map was ground truthed for accuracy and corrected, <br />all correct vegetation type delineations were transferred to a <br />1" = 400' topographic base map. Thus, the distortion associated with <br />aerial photograph irosaics was eliminated in the final vegetation map <br />~• by transferring all information to the correct topographic base map. <br />-5- <br />