Geodetic Datum

A geodetic datum (plural datums, not data) is a reference from which measurements are made. In surveying and geodesy, a datum is a set of reference points on the Earth's surface against which position measurements are made and (often) an associated model of the shape of the Earth (reference ellipsoid) to define a geodetic coordinate system. Horizontal datums are used for describing a point on the Earth's surface, in latitude and longitude or another coordinate system. Vertical datums measure elevations or depths. In engineering and drafting, a datum is a reference point, surface, or axis on an object against which measurements are made.

Read more about Geodetic DatumMotivating Theory, Datum, Horizontal Datums, Vertical Datum, Geodetic Coordinates, Defining and Derived Parameters, Parameters For Some Geodetic Systems, Conversion Calculations, Reference Datums, Engineering Datums, Examples

Other articles related to "geodetic, datum, geodetic datum":

List Of California Fourteeners
... in the following table include an elevation adjustment from the National Geodetic Vertical Datum of 1929 (NGVD 29) to the North American Vertical Datum of 1988 (NAVD 88) ... For further information, please see this United States National Geodetic Survey note ... All elevations in this article include an elevation adjustment from the National Geodetic Vertical Datum of 1929 (NGVD 29) to the North American Vertical Datum of 1988 (NAVD 88) ...
European Terrestrial Reference System 1989
... System 1989 (ETRS89) is a ECEF (Earth-Centered, Earth-Fixed) geodetic Cartesian reference frame, in which the Eurasian Plate as a whole is static ... The development of ETRS89 is related to the global ITRS geodetic datum, in which the representation of the continental drift is balanced in such a way that the ... It is the only geodetic datum to be used for mapping and surveying purposes in Europe ...
Royal Australian Survey Corps - Technology and Techniques
1933 – adopted Sydney Observatory as the geodetic datum for the eastern states, the Clarke 1858 spheroid of reference and a British modified map grid based on the Transverse Mercator map projection with Australian ... system (FILS3)to replace AN/PRR-14 1988–1992 – adopted the World Geodetic System 1984 (WGS84)as the reference framework and spheroid, which is the geodetic system of the Global Positioning System, for ... In 1994 the Australian Government adopted the Geodetic Datum Australia 1994 which for practical purposes is coincident with the World Geodetic System 1984 (WGS84) ...

Famous quotes containing the word datum:

    Language fails not because thought fails, but because no verbal symbols can do justice to the fullness and richness of thought. If we are to continue talking about “data” in any other sense than as reflective distinctions, the original datum is always such a qualitative whole.
    John Dewey (1859–1952)