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  2. U.S. National Geodetic Survey - Wikipedia

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

    The datum may be accessed via NGS's network of survey marks or through the Continuously Operating Reference Station (CORS) network of GPS reference antennas. NGS is responsible for computing the relationship between NAD83 and the ITRF. The physical components of the NSRS are reflected in its height system, defined by the vertical datum NAVD88.

  3. North American Datum - Wikipedia

    en.wikipedia.org/wiki/North_American_Datum

    NOAA-NGS-coordinates CORS-active network Archived 15 May 2013 at the Wayback Machine - explanation of NAD 83(2011/MA11/PA11) epoch 2010.00; NOAA-NGS-coordinates passive network - explanation of most recent adjustment of passive network; NADCON – a free utility for Microsoft Windows to convert between NAD 27 and NAD 83

  4. Geographic coordinate conversion - Wikipedia

    en.wikipedia.org/wiki/Geographic_coordinate...

    The formulas involved can be complex and in some cases, such as in the ECEF to geodetic conversion above, the conversion has no closed-form solution and approximate methods must be used. References such as the DMA Technical Manual 8358.1 [15] and the USGS paper Map Projections: A Working Manual [16] contain formulas for conversion of map ...

  5. North American Vertical Datum of 1988 - Wikipedia

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

    NAVD 88 was established in 1991 by the minimum-constraint adjustment of geodetic leveling observations in Canada, the United States, and Mexico.It held fixed the height of the primary tide gauge benchmark, referenced to the International Great Lakes Datum of 1985 local mean sea level (MSL) height value, at Rimouski, Quebec, Canada.

  6. United States National Grid - Wikipedia

    en.wikipedia.org/wiki/United_States_National_Grid

    The United States National Grid (USNG) is a multi-purpose location system of grid references used in the United States.It provides a nationally consistent "language of location", optimized for local applications, in a compact, user friendly format.

  7. National Geodetic Vertical Datum of 1929 - Wikipedia

    en.wikipedia.org/wiki/National_Geodetic_Vertical...

    The National Geodetic Vertical Datum of 1929 is the official name since 1973 [1] of the vertical datum established for vertical control surveying in the United States of America by the General Adjustment of 1929.

  8. State Plane Coordinate System - Wikipedia

    en.wikipedia.org/wiki/State_Plane_Coordinate_System

    The NGS expects to release the new spatial reference system and new zones in 2025. [3] As with earlier systems, the name of the new system, State Plane Coordinate System of 2022, indicates a year earlier than the actual year of release.

  9. 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 ...