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The National Spatial Reference System (NSRS), managed by the National Geodetic Survey (NGS), is a coordinate system that includes latitude, longitude, elevation, and other values. The NSRS consists of a National Shoreline, the NOAA CORS Network (a system of Global Positioning System Continuously Operating Reference Stations), a network of permanently marked points, and a set of models that describe dynamic geophysical processes affecting spatial measurements. The system is based on the datums NAD 83 and NAVD 88.

In 2024 or 2025, the NSRS will be modernized with a focus on Global Navigation Satellite Systems (GNSS) and geoid use. It will use the following four frames of reference, each representing a tectonic plate:

• North American Terrestrial Reference Frame of 2022 (NATRF2022)
• Pacific Terrestrial Reference Frame of 2022 (PTRF2022)
• Caribbean Terrestrial Reference Frame of 2022 (CTRF2022)
• Mariana Terrestrial Reference Frame of 2022 (MTRF2022)

Datum of 2022

Geodesy
Fundamentals Geodesy Geodynamics Geomatics History
Concepts Geographical distance Geoid Figure of the Earth (radius and circumference) Geodetic coordinates Geodetic datum Geodesic Horizontal position representation Latitude / Longitude Map projection Reference ellipsoid Satellite geodesy Spatial reference system Spatial relations Vertical positions
Technologies Global Nav. Sat. Systems (GNSSs) Global Pos. System (GPS) GLONASS (Russia) BeiDou (BDS) (China) Galileo (Europe) NAVIC (India) Quasi-Zenith Sat. Sys. (QZSS) (Japan) Discrete Global Grid and Geocoding
Standards (history) NGVD 29 Sea Level Datum 1929 OSGB36 Ordnance Survey Great Britain 1936 SK-42 Systema Koordinat 1942 goda ED50 European Datum 1950 SAD69 South American Datum 1969 GRS 80 Geodetic Reference System 1980 ISO 6709 Geographic point coord. 1983 NAD 83 North American Datum 1983 WGS 84 World Geodetic System 1984 NAVD 88 N. American Vertical Datum 1988 ETRS89 European Terrestrial Ref. Sys. 1989 GCJ-02 Chinese obfuscated datum 2002 Geo URI Internet link to a point 2010 International Terrestrial Reference System Spatial Reference System Identifier (SRID) Universal Transverse Mercator (UTM)
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The North American-Pacific Geopotential Datum of 2022 (NAPGD2022) is a new geodetic datum set to be produced by the U.S. National Geodetic Survey in 2025 or 2026 to improve the National Spatial Reference System (NSRS). It will replace the North American Datum of 1983 (NAD 83) and the North American Vertical Datum of 1988 (NAVD 88) with a new geometric reference frame and geopotential datum. In association with this release, a new, time-dependent geoid model, GEOID2022, will also be released. The release date for both of these was initially planned to be 2022, hence the names, although they have been delayed.

The new reference frames will rely primarily on GNSS, such as the Global Positioning System (GPS), as well as on a gravimetric geoid model resulting from NGS' Gravity for the Redefinition of the American Vertical Datum (GRAV-D) Project. These new reference frames are intended be easier to access and to maintain than NAD 83 and NAVD 88, which rely on physical survey marks that deteriorate over time.

See also

• Altitude
• Geodesy
• Sea Level Datum of 1929
• Topographic elevation
• Topography
• Reference ellipsoid
• Geoid

References

Attribution: contains public domain material copied from ngs.noaa.gov

1. "NGS Datasheet for marker DH4418 @ Chamberlain, SD".
2. "NGS - NCN Homepage". geodesy.noaa.gov. Retrieved 2022-04-19.
3. "The National Spatial Reference System". National Geodetic Survey. Retrieved April 3, 2013.
4. "How to Transition to the United States 2022 National Coordinate System Without Getting Left Behind" (PDF). United Nations Office for Outer Space Affairs.
5. Smith, Dru; Roman, Dan; Hilla, Steve. "NOAA Technical Report NOS NGS 62: Blueprint for 2022, Part 1: Geometric Coordinates" (PDF). National Geodetic Survey. Retrieved July 11, 2018.
6. "Updated Implementation Timeline for the Modernized National Spatial Reference System (NSRS)". Federal Register. 9 October 2024. Retrieved 20 November 2024.
7. US Department of Commerce, NOAA; US Department of Commerce, NOAA. "Delayed Release of Modernized NSRS, New Datums". geodesy.noaa.gov. Retrieved 2022-02-01.
8. US Department of Commerce, National Oceanic and Atmospheric Administration. "Frequently Asked Questions - FAQ - New Datums - National Geodetic Survey". geodesy.noaa.gov. Retrieved 2022-02-01.
9. ^ US Department of Commerce, National Oceanic and Atmospheric Administration. "New Datums - National Geodetic Survey". www.ngs.noaa.gov. Retrieved 2022-02-01.
10. US Department of Commerce, National Oceanic and Atmospheric Administration. "Naming Convention - New Datums - National Geodetic Survey". geodesy.noaa.gov. Retrieved 2024-04-16.

External links

• Doyle, David R. "Development of The National Spatial Reference System". National Geodetic Survey.
• "United States Geological Survey home page".
• "U.S. National Geodetic Survey home page".
• "Geodetic Glossary". United States National Geodetic Survey.
• "Orthometric Height Conversion tool". United States National Geodetic Survey.

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