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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. Pre-2022, the system is based on 
ngs.noaa.gov
NAD 83
The North American Datum (NAD) is the horizontal datum now used to define the geodetic network in North America. A datum is a formal description of the shape of the Earth along with an "anchor" point for the coordinate system. In surveying, ca ...
and NAVD 88.
In 2022, the NSRS will be modernized with a focus on 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
The Datum of 2022 is a placeholder name for a new geodetic datum set to be produced by the U.S. National Geodetic Survey in 2024-2025 to improve the National Spatial Reference System (NSRS) by replacing the North American Datum of 1983 (NAD 83) and theNorth American Vertical Datum of 1988
The North American Vertical Datum of 1988 (NAVD 88) is the vertical datum for orthometric heights established for vertical control surveying in the United States of America based upon the General Adjustment of the North American Datum of 1988.
...
(NAVD 88) with a new geometric reference frame and geopotential datum.
The new reference frames will rely primarily on Global Navigation Satellite Systems (GNSS), such as the Global Positioning System
The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radionavigation system owned by the United States government and operated by the United States Space Force. It is one of the global navigation satellite sy ...
(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
Geodesy ( ) is the Earth science of accurately measuring and understanding Earth's figure (geometric shape and size), orientation in space, and gravity. The field also incorporates studies of how these properties change over time and equivale ...
* Sea Level Datum of 1929
* Topographic elevation
* Topography
* Reference ellipsoid
An Earth ellipsoid or Earth spheroid is a mathematical figure approximating the Earth's form, used as a reference frame for computations in geodesy, astronomy, and the geosciences. Various different ellipsoids have been used as approximations ...
* Geoid
References
''Attribution'': contains public domain material copied frongs.noaa.gov
External links
* * * * * Geodesy National Geodetic Survey {{geodesy-stub