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Earth Models Geodetic Reference System Geoinformation/Geodata
Earth models describe shape and size of the figure of the earth geometrically. There are three groups of earth models, see e.g. [Voser 2007, p. 38f]:
An earth model also needs a geodetic datum to describe the position and orientation of the earth model in relation to the earth.
different earthmodels descibe different coordinates,
especially for the heights
The different earth models descibe different reference surfaces at different levels of details.