World geodetic datum WD 1 and WD 2 from satellite and terrestrial observations |
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| Authors: | B Eitschberger and E Grafarend |
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| Institution: | (1) Institut für Theoretische Geod?sie der, Nussallee 17, Universit?t Bonn 53 Bonn |
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| Abstract: | By minimizing the global distance between the (quasi-) geoid and an ellipsoid of revolution, the best parameters of an ellipsoid
and its location parameters are estimated. Input data are the absolute value of the geopotential at (quasi-) geoid level,
a set of harmonic coefficients from satellite, terrestrial or combined observations, the mean rotational speed of the earth,
and approximate values of the seminajor axis and the eccentricity of the ellipsoid. The output ranges from 6378137,63 m and
6378141,62 m for the best semimajor axis and from 298.259758 and 298.259651 for the reciprocal value of the best ellipsoidal
flattening within WD 1 and WD 2. The best translational parameters are 6.4 cm (Greenwich-direction), 0.8 cm (orthogonal to
Greenwich-direction), and 1.9 cm (parallel to rotational axis of the earth); the best rotational parameters are −0.2” (around
Greenwich-direction) and 1.1” (around orthogonal to Greenwich-direction). The dependence of the datum of the (quasi-) geoid
geopotential is studied in detail. |
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