National Map Accuracy Standards

National Map Accuracy Standards
Brief overview of map accuracy requirements in the U.S.
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NMASNational map accuracy standards are specifications of accuracy standards for well-defined map points on published maps that are specified by the U.S. Geological Survey and revised by the U.S. Bureau of the Budget.

The positional accuracy varies with the source materials used, but generally the information is no better than the established national map Accuracy standards for 1:100,000-scale maps from the U.S.

The accuracy and quality of USGS digital orthophotos must meet National Map Accuracy Standards at 1:12,000 scale for 3.75-minute quadrangles and at 1:24,000-scale for 7.5-minute quadrangles.

(2) The level of allowable error of maps, as applied by National Map Accuracy Standards, ...

It will show many streams and creeks as single lines, and will have a positional accuracy consistent with the National Map Accuracy Standards (NMAS) for 1:24,000 data, that is, a 90th percentile of error of approximately 12m.

" National Map Accuracy Standards Specifications promulgated by the U.S. Office of Management and Budget to govern accuracy of topographic and other maps produced by Federal Agencies.

Maps which meet National Map Accuracy Standards are usually produced by federal or state government agencies. Paper maps, if not already in digital format, can be utilized in developing the database through vector tablet digitizing or scanning.

The mapping bases meet national map accuracy standards and are either orthophotoquads or 7.5-minute topographic quadrangles. SSURGO data are collected and archived in 7.

The images are rectified to a Universal Transverse Mercator projection, and National Map Accuracy Standards must be met at the 1:12,000-scale for quarter-quadrangles, and at the 1:24,000-scale for quadrangles.

National Map Accuracy Standards: Accuracy standards for published maps in English units defining measurements for horizontal and vertical accuracy.

76 a point-like (isolated) feature that can be distinguished on the source and on the ground to sufficient accuracy; in US National Map Accuracy Standards of 1947, implemented as 'plottable to .01 inch'.

See also: Accuracy, Digital, Survey, Mapping, Information