The Global Positioning System (GPS) is a constellation of 30 satellites which is used for navigation and precise geodetic position measurements. Data from over 2000 receivers have been analyzed at the Jet Propulsion Laboratory, California Institute of Technology under contract with the National Aeronautics and Space Administration. JPL's GIPSY software is used to produce these time series and other useful data products. Horizontal velocities, mostly due to motion of the Earth's tectonic plates, are represented on the map by lines extending from each site. Click on a dot or name to see detailed time series for a particular site. Additional information may be obtained from email@example.com.
Orbits: S. Desai, W. Bertiger, J. Gross, B.
Haines, N. Harvey, C. Selle, A. Sibthorpe, J. Weiss
Point Positions: A. Moore, S. Owen
Time Series and Web Site: M. Heflin