National Spatial Reference System

From Wiki.GIS.com

The National Spatial Reference System (NSRS), which is managed by the National Geodetic Survey (NGS), is a coordinate system that includes latitude, longitude, elevation and other values. The NSRS consists of a National Shoreline; the National CORS, a system of Global Positioning System Continuously Operating Reference Stations; and a network of over one million permanent survey markers.

[edit] References

• "The National Spatial Reference System". http://www.ngs.noaa.gov/INFO/OnePagers/NSRS.html. 
• Doyle, David R.. "DEVELOPMENT OF THE NATIONAL SPATIAL REFERENCE SYSTEM". http://www.ngs.noaa.gov/PUBS_LIB/develop_NSRS.html.