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  2. U.S. National Geodetic Survey - Wikipedia

    en.wikipedia.org/wiki/U.S._National_Geodetic_Survey

    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.

  3. National Spatial Reference System - Wikipedia

    en.wikipedia.org/wiki/National_Spatial_Reference...

    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.

  4. VERTCON - Wikipedia

    en.wikipedia.org/wiki/VERTCON

    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 .

  5. North American Vertical Datum of 1988 - Wikipedia

    en.wikipedia.org/wiki/North_American_Vertical...

    Tidal Datums, produced for NOAA by its 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

  6. Survey marker - Wikipedia

    en.wikipedia.org/wiki/Survey_marker

    NGS Survey Data Explorer is an interactive map that will find markers in a selected location. Marker types identified. Marker links to data sheet. This website provides a state-by-state mapping of NGS survey marks on to Google Maps, enabling one to search for these marks visually. Description and history of the types of markers used in the ...

  7. Benchmarking (hobby) - Wikipedia

    en.wikipedia.org/wiki/Benchmarking_(hobby)

    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 ...