The National Geodetic Survey (NGS), an office of NOAA's National Ocean Service, coordinates two networks of continuously operating reference stations (CORS): the National CORS network and the Cooperative CORS network. Each CORS site provides Global Positioning System (GPS) carrier phase and code range measurements in support of 3-dimensional positioning activities throughout the United States and its territories.
Surveyors, GIS/LIS professionals, engineers, scientists, and others can apply CORS data to position points at which GPS data have been collected. The CORS system enables positioning accuracies that approach a few centimeters relative to the National Spatial Reference System, both horizontally and vertically.
The CORS system benefits from a multi-purpose cooperative endeavor involving many government, academic, commercial and private organizations. New sites are evaluated for inclusion according to established criteria.
All national CORS data are available from NGS at their original sampling rate for 30 days. After that time, the data are decimated to a 30 second sampling rate. Cooperative CORS data are available from the participating organization that operates the respective site. Links to Web pages containing the Cooperative CORS data are provided from the NGS CORS Map and the Cooperative CORS Web page.
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We provide these data in good faith and shall in no event be liable for any lost profits, and special, indirect or consequential damages to any party, arising out of or in connection with the use or the inability to use the data hereon or the services provided. We provide these data and services as a convenience to the public. Furthermore, we reserve the right to change, revise, or otherwise discontinue published data and/or these services at any time without further notice.