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WGS84 - the CRS of GPS under construction Earth Geodetic Reference System GNSS
World Geodetic System 1984 (WGS84)
The geodetic reference system of the Global Positioning System GPS.
It is a geocentred WGS84 ellipsoid of revolution.
World Geodetic System 1984 at NGA (DoD) Earth Geodetic Reference System www GNSS
The official and original description of the WGS84 geodetic reference system:
  "Department of Defense World Geodetic System 1984, Its Definition and Relationships With  Local Geodetic Systems" -  Techncal Report TR8350.2
WGS 84 Earth Gravitational Model Earth Geodetic Reference System www
different Earth Gravitational Models (EGM) for WGS84 are built up:
GPS - Global Positionning System Earth www
A Global Navigation Satellite System (GNSS) which is funded by and controlled by the U. S. Department of Defense (DoD).
The GPS Site of Peter H. Dana - The Geographers Craft Earth www
A comprehensive site about GPS.
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