National Geospatial Data Asset (NGDA) Continuously Operating Reference Stations (CORS)

Metadata Updated: December 7, 2020

The National Geodetic Survey (NGS), an office of NOAA's National Ocean Service, manages a network of Continuously Operating Reference Stations (CORS) that provide Global Navigation Satellite System (GNSS) data consisting of carrier phase and code range measurements in support of three dimensional positioning, meteorology, space weather, and geophysical applications throughout the United States, its territories, and a few foreign countries. Surveyors, GIS users, engineers, scientists, and the public at large that collect GPS or GNSS data can use CORS data to improve the precision of their positions. CORS enhanced post-processed coordinates approach a few centimeters relative to the National Spatial Reference System, both horizontally and vertically. The CORS network is a multi-purpose cooperative endeavor involving government, academic, and private organizations. The sites are independently owned and operated. Each agency shares their data with NGS, and NGS in turn analyzes and distributes the data free of charge. As of August 2018, the CORS network provides data from more than 2,000 active sites. CORS data holdings to include decommissioned stations, comes to a total of 2,718 sites. These sites are contributed by over 230 different organizations, and the network continues to expand.

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources


Metadata Date November 24, 2020
Metadata Created Date October 12, 2020
Metadata Updated Date December 7, 2020
Reference Date(s) April 21, 1994 (publication)
Frequency Of Update continual

Metadata Source

Harvested from NOS NGS

Graphic Preview

CORS interactive map

Additional Metadata

Resource Type Dataset
Metadata Date November 24, 2020
Metadata Created Date October 12, 2020
Metadata Updated Date December 7, 2020
Reference Date(s) April 21, 1994 (publication)
Responsible Party NGS Communications and Outreach Branch (Point of Contact, Custodian)
Contact Email
Access Constraints Cite As: National Geodetic Survey, [Date of Access]: National Geospatial Data Asset (NGDA) Continuously Operating Reference Stations (CORS) [Data Date Range],, Access Constraints: None | Use Constraints: While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. | Distribution Liability: Use at your own risk
Bbox East Long 180
Bbox North Lat 90
Bbox South Lat -90
Bbox West Long -180
Coupled Resource
Frequency Of Update continual
Graphic Preview Description CORS interactive map
Graphic Preview File
Guid gov.noaa.nmfs.inport:39662
Harvest Object Id 4a3cdb43-8458-4793-8f7f-0832967e00c9
Harvest Source Id 45f16b0a-fe35-49cb-935b-e15c87408ade
Harvest Source Title NOS NGS
Licence NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
Metadata Language eng
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System EPSG::6319
Spatial Harvester True
Temporal Extent Begin 1994-04-21

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