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National Geodetic Survey - CORS
The National Geodetic Survey (NGS), an office of NOAA's National Ocean Service (NOS),coordinates a network of Continuously Operating Reference Stations (CORS) that provide Global Positioning System (GPS) measurements in support of a broad spectrum of navigation and positioning applications in the U.S. and its territories.
go to the National Geodetic Survey's CORS main website (external link)
NGDC information about the CORS dataset can be found in the NGDC NMMR metadata record.