Reliability of the Data: The source of topographic information presented in Figure 10 is the U.S.G.S. map titled "Classes of Land Surface Form" which was adapted from a map by Edwin H. Hammond. This map was also published in the National Atlas of the United States. This USGS map sets forth five general land surface form categories with some 21 subcategories. For exclusion purposes, three of these 21 subcategories were mapped. These were high hills, low mountains and high mountains, with less than 20% of the land area gently sloping. These were chosen because they were the three categories that indicated the most severe slope constraint. Therefore, these mapped areas include only those areas where it is felt that a definite slope problem exists. Certain other areas of the United States that are not shown in Figure 10 could cause problems with respect to topography. Spatial Coverage: The variables mapped in Figure 10 comprise 2436 grid cells. G. SOUTH SLOPES - FIGURE 11 Rationale: Because the satellite will be in geosynchronous orbit at the equator, the microwave beam could reach a rectenna sited on the south side of ridges or mountains that run predominantly east-west. For this reason, areas with otherwise unacceptable topography may be potential sites, and, this subset of the high hills, low mountains and high mountains category is considered as a potential exclusion variable. Reliability of the Data: The information concerning the east-west ridges is taken from the U.S.G.S. map titled "Shaded Relief", also from the National Atlas of the United States. This information is considered to be highly reliable, although the determination of the dividing line between the northern and southern boundaries of such east-west ridges is subject to interpretation and some error. This information, shown on Figure 11 is considered to be reasonably accurate. Spatial Coverage: The variables mapped in Figure 11 cover 142 grid cells.
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