 |
 |
 |
|---|---|---|
| National CORS | Map | Questions/Comments | ||
|
|
|
|---|---|---|
| National CORS | Map | Questions/Comments | ||
The National Geodetic Survey (NGS), an office of NOAA's National Ocean Service, coordinates a network of continuously operating reference stations (CORS). Each CORS site provides Global Navigation Satellite System (GNNS - GPS and GLONASS) carrier phase and code range measurements in support of 3-dimensional positioning activities throughout the United States and its territories (map).
Surveyors, GIS/LIS professionals, engineers, scientists, and others can apply CORS data to position points at which GNNS 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. See our newest sites and their coordinates.
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 in the process of merging with National CORS. All National CORS and Coop CORS data can be obtained from the National CORS Page.