IMPROVING A HORIZONTAL DATUM WITHOUT CHANGING THE COORDINATES

Abstract

The 7-parameter similarity transformation between a global and a local reference system presupposes knowledge of the separation between the geoid and the local ellipsoid. The local geoidal heights might be impaired by errors of several metres. To prevent these errors from having a bad influence on the horizontal fit, the transformation parameters should be determined with appropriate height constraints. Parameters determined in this way can be used to compute improved geoidal heights above the local ellipsoid, which in turn will put the local geodetic coordinates reduced to the ground in better agreement with the actual point positions at the earth's surface.

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