CORS

CORS Data Products

GPS data collected at CORS sites are available to download for "post-processing."

Methods of Obtaining CORS Data

Customized
User Friendly CORS (UFCORS)
Standard
standard1.shtml
Anonymous FTP
Primary server ftp://www.ngs.noaa.gov/cors/ - Directory Tree
Alternate server ftp://alt.ngs.noaa.gov/cors/ - Directory Tree

CORS Coordinates

Published coordinates at CORS Explained
Predict horizontal displacements with HTDP

Metadata / Station Logs

Station/site log files contain all the historical equipment (receiver/antenna) used at that site, approximate location, owner and operating agency, etc. We must stress that the the position/coordinates listed in the log file like that in the RINEX header files should be considered APPROXIMATE. When a user downloads data they should at the same time download the published NGS coordinate (position and velocity) file for that site. You can find that file here.

Show Directory of All Logfiles

A sortable list of all CORS sites and their status is available

CORS Site List ( kml ) The coordinates listed in this KML file are for reference frame ITRF00, epoch 1997.0 which are assumed equivalent to WGS84 ( G1150 ).

....... In absolute positioning, the frame WGS84 (G1150) is materialized not by the coordinates of marks on the surface of the Earth - as the NAD83 (CORS96) is - but by the coordinates of points in space, namely, the 3-D location of the GPS satellites (given by their precise or broadcast satellite ephemerides). Recent investigations [True, 2004] have shown that for all practical purpose, the WGS84 (G1150) frame is identical to the International Terrestrial Reference Frame of year 2000 (ITRF2000). Thus, except for very accurate geophysical calculations (crustal dynamics; tectonic strain determination, etc.), the WGS84 (G1150) is supposed to be aligned with the ITRF2000. In another words, both have the same origin, orientation, and scale.

Antenna Calibrations