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aircraft's altitude Ames Research Center angular bearing CGI data base CGI map CGI reference CGI terrain data circle of minimum circumference COMPUTATIONAL METHOD computer generated imagery coordinate designates the line designates the mountain distance end points end vectors equation evaluated exterior lines F. J. Moran ground-mapping radar horizontal line containing horizontal radar range imagery CGI intersect the radar intersection formed line segment line with radar major circles major or minor method for modeling minimum area Moffett Field motion simulator moun mountain and line mountain projection mountains contained move the center NASA Performing Organization point F prestored quantities radar heading angle radar model radius range-altitude profile rapid rejection rectangle Refer to figure referenced REJECT LINE segment of mountain set of parameters slope-intercept form tain terrain data base Terrain-Following Radar tion traversed two-dimensional array designating two-dimensional vectors vehicle position vertical plane containing visible polygons x-y plane XA/C xc,yc YA/C