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WGS84: World Geodesic System - revision dating from 1984
The World Geodesic System defines a reference frame for the earth, based on a reference geoid, using a reference ellipsoid.
WGS84 is a coordinate system, defining a reference frame for the earth, thanks to primary and secondary parameters :
- primary parameters define the shape of the ellipsoid of the earth, its angular speed and its mass
- secondary parameters define a detailed gravity model of the earth
Secondary parameters are necessary : WGS84 is used not only to define coordinates, but also to determine the orbit of the GPS navigation satellites.
GPS coordinates from a GPS receiver actually are a latitude, a longitude and an altitude calculated according to the WGS84 coordinate system.
GPS coordinates from a GPS receiver actually are a latitude, a longitude and an altitude calculated according to the WGS84 coordinate system.