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Article: Dealing with published positional accuracies.(National Geodetic Survey)(www.ngs.noaa.gov)
- Article from:
- Point of Beginning
- Article date:
- February 1, 2006
- Author:
CopyrightCOPYRIGHT 2006 BNP Media. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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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 www.ngs.noaa.gov. In addition to readjusted coordinates, the output of the readjustment will be an accuracy value at the two standard deviations (2[sigma]s) 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 ...