Alabama
map
GTAC
Earl Dudley

Alaska
map
ACCU
ANC1
CMJV
UAAG

Arkansas
map
ARK1
CTA1
CSAL

California
map
SSCC
CMOD
HSIB
LEIC
PLSB
SEIB
SHJB
TMSB

Colorado
map
MC01

Connecticut
map
NRME
RVDI

Georgia
map
Cobb County

Illinois
map
RRW1
SIFH
VODG
DuPage County
Kara Company

Coop CORS now providing daily solutons!! See Plots

Check on the Status of New Coop Sites

The Cooperative CORS (continuously operating reference station) system provides access to GPS data that are disseminated by organizations other than the National Geodetic Survey (NGS).   This web page contains links to the web sites of cooperating organizations where users can download pertinent GPS data, positional coordinates, and related information.  NGS computes these positional coordinates to ensure their consistency with the National Spatial Reference System (NSRS).

Cooperative CORS and OPUS team up!
OPUS users may now select qualifying Cooperative CORS to process RINEX data.  This upgrade will provide users access to more and possibly closer quality base stations.

Please contact the cooperating organization if you encounter difficulties in accessing information from their web site.

You can access the Cooperative CORS site directly by clicking on the site ID on the sides.

If a broken link is encountered please let us know.

Welcome Surveying And Mapping, Inc. with SAM1 in Austin, TX.

Welcome Lancaster County, PA with site LANC in Lancaster.

Welcome back ... University of Connecticut with site NRME in Storrs, CT

Seiler Instrument has added 3 more sites .....
SIMS in St. Louis, MO - SIDC in St. Charles, MO - SIFH in Fairview Heights, IL

Earl Dudley has added 3 more sites .....
EDM1 in Memphis, TN - EDM2 in Atoka, TN - WINU in Winchester, TN

DuPage County in Illinois has added 2 more .....
DP3A in Naperville and DP4A in Burr Ridge