Columns / Popular Archived Series

The GPS Observer

January 31, 2006
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As I have reported in previous GPS Observer columns (POB November 2004, December 2005), the National Geodetic Survey (NGS) is in the process of readjusting the National Spatial Reference System (NSRS). This will be the first-ever three-dimensional national adjustment. Detailed information about this readjustment is available on the NGS website at In addition to readjusted coordinates, the output of the readjustment will be an accuracy value at the two standard deviations (2σs) level for each component of the station's position. Since the detailed information on the format of the data sheet has not been published, this gives me leeway to speculate on what will happen.
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