Data Series 475
Figure 2. A base station, designation GP39082-23, on a rocky ledge in the Selah Gap near Yakima, Washington. Basic components of the base station shown are a global positioning system (GPS) receiver on a tripod and a radio on a separate tripod (right of the GPS receiver) with a radio transmitting antenna. The GPS controller that logs the data and sets the various parameters in the instruments is not shown. (Photograph taken by Karen Payne, U.S. Geological Survey, August 13, 2008) |
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