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A (relatively prominent) survey monument that is part of the NSRS [1]. 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 National Geodetic Survey (NGS) is a United States federal agency based in Washington, D.C. that defines and manages a national coordinate system, providing the foundation for transportation and communication, mapping and charting, and a large number of science and engineering applications.
Each NGS-listed mark has a permanent identifier (PID), a six-character code that can be used to call up data about that mark on the National Geodetic Survey website. [5] Other websites offer maps of the locations (and PIDs) of marks in each individual state of the U.S. [ 6 ] Until 2023, Geocaching.com had a section of its site devoted to ...
The program was created by the National Geodetic Survey (NGS) in 1994 and is available as an online tool, [2] or PC executable package. [3] The package contains the Perl source code. The NGS is the government agency charged with responsibility for the National Spatial Reference System. [4]
PACS and SACS are designated by the National Geodetic Survey and must meet the specific siting, construction, and accuracy requirements. (also see airport security) PACS coordinates are established by meeting a survey, data processing, adjustment and reporting standard known as the NGS Bluebook. (See Aviation safety for more info)
It superseded the National Geodetic Vertical Datum of 1929 (NGVD 29), [2] previously known as the Sea Level Datum of 1929. NAVD 88, along with North American Datum of 1983 (NAD 83), is set to be replaced in 2025 with a new geometric reference frame and geopotential datum, based on GPS and gravimetric geoid models.
The National Geodetic Survey has announced a modernization of the National Spatial Reference System, and a replacement of the state plane coordinate system will be part of the modernization. The number of zones will be substantially higher than the 1983 system.
NGVD29 was superseded by the North American Vertical Datum of 1988 , [3] based upon reference to a single benchmark (referenced to the new International Great Lakes Datum of 1985 local mean sea level height value), although many cities and U.S. Army Corps of Engineers "legacy" projects with established data continued to use the older datum.