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Topographic Earth And Landscape Models Geoinformation/Geodata
Topography - Reality - Cognition [Voser 2001]
One of the 3 definitions of "figure of the earth" [Moritz 1990, p. 1]:
A) The solid and liquid earth bounded by the physical earth's surface, or topographic surface, which is the surface which we see, on which we stand, walk, drive, and, occasionally, swim. It is highly irregular, even after some obvious smoothing which is always necessary to make it a smooth surface amenable to mathematical treatment, and also after some averaging with respect to time since this surface undergoes temporal variations (on the order of decimeter or more) because of tidal effects, etc.