Transcription of Map Accuracy Standards - USGS
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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.
tested must be accurate within 1/50th of an inch (0.05 centimeters) on the map. At 1:24,000 scale, 1/50th of an inch is 40 feet (12.2 meters). The vertical accuracy standard requires that the elevation of 90 percent of all points tested must be correct within half of the contour inter-val. On a map with a contour interval of
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