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. At separately to determine precise eleva- marks, the map is not very useful. 1:24,000 scale, 1/50th of an inch is 40 tions.
vital, for example, to engineers, highway officials, and land-use planners who use USGS topographic maps as basic plan-ning tools. As a result, the USGSmakes every effort to achieve a high level of accuracy in all of its published products. An important aim of its accuracy control program is to meet the U.S. National Map Accuracy Standards.
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