site search by freefind

follow me


earth models Geodetic Reference System Geoinformation/Geodata
Earth models describe shape and size geometrically. There are three groups of earth modells,  see e.g. [Voser 2007, p. 38f]:
  • mathematical earth models
  • physical earth models
  • topographical earth and landscape models
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.