The National and Cooperative CORS Systems in 2000 and Beyond

Richard A. Snay

Abstract:	The National Geodetic Survey (NGS) manages the National CORS (continuously operating reference station) system that comprises a network of over 190 sites containing geodetic quality Global Positioning System (GPS) receivers. This network is currently growing at a rate of about 3 sites per month. NGS collects, processes, and distributes data from these sites in support of high-accuracy 3D positioning activities throughout the United States and its territories. In January 2000, NGS upgraded its CORS website (http://www.ngs.noaa.gov/CORS/) with a map-based interface that, among other features, enables people to easily determine whether or not a CORS site has GPS data for a specific time. NGS is also organizing the "Cooperative CORS" network that includes additional GPS base stations whose data are freely distributed by cooperating institutions via the Internet. Furthermore, NGS will soon endorse specifications for constructing a pier for mounting a permanent GPS antenna. Finally, a recent study quantifies the advantages of using hourly-updated NOAA weather models for processing GPS data.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	55 - 58
Cite this article:	Snay, Richard A., "The National and Cooperative CORS Systems in 2000 and Beyond," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 55-58.
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