NAD 83(NSRS2007)
National Readjustment

NAD 83(NSRS2007) National Readjustment

A readjustment of all Global Positioning System (GPS) survey control in the United States was completed on February 10, 2007 by the National Geodetic Survey (NGS). The adjustment was undertaken to resolve inconsistencies between the existing statewide High Accuracy Reference Network (HARN) and/or Federal Base Network (FBN) adjustments and the nationwide Continuously Operating Reference Station (CORS) system, as well as between states, and to develop individual local and network accuracy estimates. For these reasons, on September 24, 2003, NGS' Executive Steering Committee approved a plan for the readjustment of horizontal positions and ellipsoid heights for GPS stations only in the contiguous United States, Alaska, Puerto Rico and the US Virgin Islands. Classical surveys were not included in this readjustment

NAD 83(NSRS2007) Final Reports

• NOAA Technical Report NOS NGS 60 NAD 83(NSRS2007)
• NSRS2007 Analysis (Electronic Support Material available here)

A file containing a list of CORS and CGPS sites included in the readjustment have been added to the library. This file can be accessed from here. The file is a pdf and you must have Acrobat Reader to view the file.

Statements:

• Concerning the publication of the NAD 83(NSRS2007) coordinates
• Control used for the NAD 83(NSRS2007) adjustment
• Differences between NAD 83(NSRS2007) and NAD 83(CORS 96)
• Data sheet modifications for the NAD 83(NSRS2007) coordinates
• Policy statement on transformation between NAD 83(NSRS2007) and older NAD 83 versions