Metrology Department

SLAC GPS Station M40

GPS base station

SLAC's existing GPS base-station has been upgraded and in addition to providing RTK site surveys it now also contributes to the solid earth research community (See Interaction Point article). The base-station was added to the Plate Boundary Observatory (PBO) on September 26th. This is part of the EarthScope project funded by the National Science Foundation studying the three-dimensional strain field resulting from deformation across active plate boundaries in the Western United States. A Memorandum of Understanding (MOU) between SLAC and the University NAVSTAR Consortium (UNAVCO) regarding participation in the PBO was signed in early September 2005. See SLAC UNAVCO MOU.

The real-time data generated by the base-station can be seen at and further information on UNAVCO can be found at

GPS/RTK Site Surveys

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Last update: June 12, 2007