The use of GPS has revolutionized surveying.
Revised
April 19, 2007
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National Oceanic and Atmospheric Administration | U.S. Department of Commerce
http://celebrating200years.noaa.gov/foundations/satellite_geodesy/gps_obs_650.html
National Oceanic and Atmospheric Administration | U.S. Department of Commerce
http://celebrating200years.noaa.gov/foundations/satellite_geodesy/gps_obs_650.html