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ISPRS 1999 Triaxial Ellipsoid as a Reference-Surface on Mars Mapping
At the development of a mathematical basis of cartographic products the problems of selection of a reference-surface system, system of coordinates, and also selection and elaboration of cartographic projections are decided. The selection of a reference-surface, as a rule, is connected to use of some idealized (model) surface. At large-scale mapping of the very small areas for these purposes the plane approaches. However at increase of territories and application of middle, and especially of small scales, in which the celestial body is mapped as a whole, until recently it was considered sufficient to use a sphere of a given radius. Thus supposed, that the center of a reference-surface coincides center of mass of a planet or satellite, and polar axis coincides with rotation axis. For a long time during pre-space and transient periods of celestial bodies mapping the sphere remained practically unique model surface. With appearance of the new data updating the form and the sizes of the Solar system bodies other regular reference-surfaces came to use. First of all, a rotation ellipsoid having small polar compression (parameters of this ellipsoid were R polar = 3 376.3 km, R equatorial = 3 393.4 km) have applied to Mars. Then for the first time a triaxial ellipsoid was tested for Phobos. Last time some elements of mathematical base for irregular surfaces maximum approximated to an actual physical surface of the celestial bodies are developed.
- L. M. Bugaevsky, K. B. Shingareva
- Added to Astropedia
- 16 May 2012
- 9 July 2013
- Geospatial Data Presentation Form