Article: National Geodetic Survey.(Internet Resource of the Month)

http://www.ngs.noaa.gov/OPUS

The National Geodetic Survey (NGS) operates the Online Positioning User Service (OPUS) to provide Global Positioning System (GPS) users easier access to the National Spatial Reference System.

OPUS allows users to submit GPS data files to NGS, where the data will be processed to determine a position using NGS computers and software. Each data file submitted will be processed with respect to three Continuously Operating Reference Station (CORS) sites selected by distance, number of observations, site stability, etc. Positions for the data are reported back to users via e-mail in International Terrestrial Reference Frame (ITRF) ...

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