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  2. World Geographic Reference System - Wikipedia

    en.wikipedia.org/wiki/World_geographic_reference...

    For example, on a GEOREF chart, Naval Air Station Patuxent River (38°17′10″N 76°24′42″W) / (38.286108, -76.4291704) is located (to the nearest minute) at position GJPJ3417. To locate the position from the coordinates, proceed as follows: Right from 180° longitude to longitude zone G; Up from the South Pole to latitude zone J

  3. Geodetic datum - Wikipedia

    en.wikipedia.org/wiki/Geodetic_datum

    A geodetic datum or geodetic system (also: geodetic reference datum, geodetic reference system, or geodetic reference frame, or terrestrial reference frame) is a global datum reference or reference frame for unambiguously representing the position of locations on Earth by means of either geodetic coordinates (and related vertical coordinates) or geocentric coordinates. [1]

  4. Geodetic coordinates - Wikipedia

    en.wikipedia.org/wiki/Geodetic_coordinates

    Geodetic latitude and geocentric latitude have different definitions. Geodetic latitude is defined as the angle between the equatorial plane and the surface normal at a point on the ellipsoid, whereas geocentric latitude is defined as the angle between the equatorial plane and a radial line connecting the centre of the ellipsoid to a point on the surface (see figure).

  5. Survey marker - Wikipedia

    en.wikipedia.org/wiki/Survey_marker

    In the U.S., some survey markers have the latitude and longitude of the station mark, a listing of any reference marks (with their distance and bearing from the station mark), and a narrative (which is updated over the years) describing other reference features (e.g., buildings, roadways, trees, or fire hydrants) and the distance and/or ...

  6. Degree Confluence Project - Wikipedia

    en.wikipedia.org/wiki/Degree_Confluence_Project

    The precise location of each degree confluence uses the WGS 84 horizontal datum, and visitors to degree confluences almost always make use of GNSS receivers. [1] For a successful visit, the visitor must get within 100 metres of the confluence point, and post a narrative and several photographs to the project website.

  7. Military Grid Reference System - Wikipedia

    en.wikipedia.org/wiki/Military_Grid_Reference_System

    1234 5678 (numerical location; easting is 1234 and northing is 5678, in this case specifying a location with 10 m resolution) An MGRS grid reference is a point reference system. When the term 'grid square' is used, it can refer to a square with a side length of 10 km (6 mi), 1 km, 100 m (328 ft), 10 m or 1 m, depending on the precision of the ...

  8. List of principal and guide meridians and base lines of the ...

    en.wikipedia.org/wiki/List_of_principal_and...

    Primarily from the United States Government Printing Office Style Manual. [1] State names usually signify only parts of each listed state, unless otherwise indicated. Based on the BLM manual's 1973 publication date, and the reference to Clarke's Spheroid of 1866 in section 2-82, coordinates appear to be in the NAD27 datum.

  9. Module:Location map/data/USA Southeast - Wikipedia

    en.wikipedia.org/wiki/Module:Location_map/data/...

    Module:Location map/data/USA Southeast is a location map definition used to overlay markers and labels on an equirectangular projection map of Southeastern United States. The markers are placed by latitude and longitude coordinates on the default map or a similar map image.

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