Map Accuracy Standards - USGS

Map Accuracy Standards As applied to the USGS positions from aerial photographs. Field Map Accuracy quadrangle topographic map, the hori- survey methods are the only tests An inaccurate map is not a reliable map. zontal Accuracy standard requires that the accepted for official Accuracy testing. X may mark the spot where the trea- positions of 90 percent of all points Positions must be obtained by surveys of sure is buried, but unless the seeker can tested must be accurate within 1/50th of a higher Accuracy . Vertical tests are run locate X in relation to known land- an inch ( centimeters) on the map. At separately to determine precise eleva- marks, the map is not very useful.

standards. In 1941, the U.S. Bureau of the Budget issued the “United States National Map Accuracy Standards,” which applied to all Federal agencies that produce maps. The standards were revised several times, and the current version was issued in 1947. (The stan-dards are printed on the reverse of this factsheet.) As applied to the USGS 7.5 ...

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