not mapped due to time constraints. National grasslands do not have the spatial coverage of the national forests but they should have been included on this national forest map. Therefore, the information contained in Figure 6 should have been expanded to include national grasslands. Spatial Coverage: The areas coded as national forests are present in 1323 grid cells. D. POPULATION - FIGURE 7 Populated areas offer several constraints with respect to rectenna siting. First, populated areas represent dedicated land uses and the displacement of large numbers of people is considered to be highly undesirable. Second, land prices in more densely populated areas will be substantially higher than in other areas of the United States. Third, microwave exposure levels adjacent to the rectenna will be higher than the background non-occupational standard used by the Societ Union. Although much research will have to be conducted before definitive statements can be made about microwave effects, this study's approach was to avoid locations immediately adjacent to urbanized areas. Given a desire to avoid populated areas, the next question to be addressed concerns the definition of populated areas. Three variables were utilized in the map shown in Figure 7. These are (1) Standard Metropolitan Statistical Areas, (2) population density greater than 50 persons per square mile and (3) adjuster population distribution. The rationale for utilizing these variables is presented in the following sections. Two general problems must be raised at this stage. First, the source for population information is the United States census, with the last census having been conducted in 1970. Therefore, population data taken from the census is 8 years old. Because this information is dated, the issue of future growth is raised. Although it is difficult
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