Global Positioning System (GPS) About: The 24 satellites that make up the GPS space segment are orbiting the earth 11,000 to 12,000 miles above us. They are constantly moving, making two complete orbits in less than 24 hours. These satellites are travelling at speeds of roughly 7,000 miles an […]


  Geog. Info. Sys. Basics (ch 2.2) Scale… (Map Scale, Analysis Scale) Map scale (verbal scale, graphic scale, representative fraction) Map scales are an expression of the numerical relationship between measurements made on the map (the map units) and the same measurements made on the ground (the ground units). Verbal […]

FANR 3800: 4. Map Scale