GPS Coordinates as a GIS Attribute

Vidal Ashkenazi and Terry Moore

Abstract:	Maps, both analogue and digital, are normally the main medium for the presentation of coordinate data. Maps are routinely used to scale off dimensions and ranges, obtain bearings, extract positional information and as the basis of of Geographical Information Systems. However, map coordinates suffer from several error sources, notably geodetic datum, projection grid, survey and currency errors. A GIS rarely includes information regarding the quality of stored coordinates, in terms of accuracy, reliablility, source and currency. These problems have been highlighted with the increasing usage of GPS in engineering surveying and geodesy. The paper will identify and quantify, through examples, the sources of errors in map coordinates, and discuss ways of combining these with GPS derived positions.
Published in:	Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993) September 22 - 24, 1993 Salt Palace Convention Center Salt Lake City, UT
Pages:	85 - 88
Cite this article:	Ashkenazi, Vidal, Moore, Terry, "GPS Coordinates as a GIS Attribute," Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993), Salt Lake City, UT, September 1993, pp. 85-88.
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