GRS 80

The Geodetic Reference System 1980 ( GRS 80, engl. Geodetic Reference System 1980) is an earth model, which contains the key parameters of the figure of the earth, the earth's rotation and the gravity field.

The reference ellipsoid GRS 80 is the European Spatial Reference System ETRS89 as geometric computing and imaging surface and forms with it the geodetic datum for the uniform land surveying. As an imaging system while the conformal UTM projection is used. In Germany, on the Bessel ellipsoid ( Potsdam Datum ) and the Krasovsky ellipsoid (Pulkovo - date) are changed based Gauss-Krueger - coordinates on GRS80 and UTM.

GRS 80 also defines the normal gravity, replacing GRS 67 from. WGS 84 used virtually the GRS 80 ellipsoid, but contains more data on the gravitational field.

Definition

GRS 80 in 1979 to the General Assembly of the IUGG, the International Association of Geodesy and Geophysics decided, and after consultation with the International Astronomical Union (IAU ) by the study group, Univ. Prof. Helmut Moritz, 1980 published in detail.

The four defining geometrical and physical parameters are:

The derived parameters describing the shape of the earth ellipsoid are: