1. Marshes - Figure 8 Marshes were identified on the basis of vegetation. The source of this information was A. W. Kuehl er's 1966 map titled "Potential Natural Vegetation". This map was included in the National Atlas of the United States, published by the United States Geological Survey in 1970. Those vegetation types mapped included (1) the Mangrove broadleaf forest, (2) the Everglades grassland, (3) the Cypress Savanna grassland, (4) the live oak-sea oats grassland, (5) the southern cordgrass prairie and (6) the northern corigrass prairie. This information is considered to be highly reliable. However, a disparity may arise because a grid square was coded if a marsh was present (but not necessarily dominant) in that grid square. 2. Wetlands - Figure 9 Wetlands were identified from the United States Geological Survey map titled "Major Land Uses", also from the National Atlas of the United States. In this mapping effort, the areas of the United States classified as swamps were entered in the grid scares shown in Figure 9. It should be noted that this USGS map only showed the dominant land uses within mapped areas, and many other portions of the United States would have substantial acreages of wetlands that are not the dominant land use type. A grid cell was coded for wetlands if any portion of the grid cell intersected mapped swamp areas. Spatial Coverage: The areas mapped as marshes in Figure 8 consist of 219 grid cells and the areas mapped as wetlands in Figure 9 consist of 487 grid cells. F. TOPOGRAPHY UNACCEPTABLE - FIGURE 10 Rational: Excessively steep slopes are considered to be unacceptable for rectenna construction, either because the microwave beam cannot intersect the rectenna or because the problems of construction are too severe. With one exception, discussed in Section 7, infra, those areas mapped as having unacceptable topography are considered as absolute exclusion variables.
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