Geocentric coordinate system

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Geocentric coordinate system

The geocentric coordinate system is a three-dimensional rectangular Cartesian coordinate system with the coordinates X, Y and Z. Its coordinate origin (0,0,0) lies in the center of mass of the reference ellipsoid chosen as the model of the earth .

The Z-axis runs along the central axis of rotation of the earth . It is defined by the International Service for the Rotation of the Earth ( IERS ) as the IERS Reference Pole (IRP) and the current exact pole movements are thus ignored. The X-axis runs at the level of the equator through the prime meridian ( Greenwich ). As a result, the Y-axis, since it is at right angles to the other two axes, runs eastward at the level of the equator .

The coordinate axes form a right system that rotates with the earth. The distance between a point in this coordinate system and a certain location on the earth's surface always remains the same.

In the field of satellite navigation, the geocentric coordinate system ECEF (Earth-Centered, Earth-Fixed) was defined. It is used because no specific ellipsoid has to be specified here.

See also

Web links

supporting documents

  1. Reference systems. (pdf; 413 kB) (No longer available online.) In: Infoblatt. Vermessungsbuero-Wehmeyer, archived from the original on July 16, 2016 ; accessed on July 16, 2016 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.vermessungsbuero-wehmeyer.de
  2. ^ Iwan Berger: Geodetic coordinate systems. (pdf; 1.3 MB) In: Technical seminar document. RheinMain Wiesbaden University of Applied Sciences, February 2009, accessed on July 16, 2016 .
  3. Lutz Höll: Basics: Geodetic datum, map projections and coordinate systems in Germany and Austria. (PDF; 1.24MB) In: yumpu.com. 1998 (registration required).;
  4. James R. Clynch: Earth Coordinates. (PDF file; 396 kB) The University of New South Wales (UNSW) - Australia, February 2006, pp. 2–3 , archived from the original on January 24, 2014 ; accessed on July 16, 2016 .