Integration of GPS, Geoidal Model and Leveling Networks for Orthometric Heights Determination

João F. Galera Monico and André L. P. de Castro

Abstract:	The determination of orthometric heights using the global positioning system (GPS) requires the knowledge of the geoid height. However, in general, the precision of the available geoid models is not in the same level as that capable of being obtained by GPS leveling. Therefore, in order to use GPS for heightening, some additional efforts have to be taken into account. In general, the solution for local applications has been based on the use of GPS leveling, geoid model and leveling network, by using integration technique. The selection of a suitable set of polynomial parameters and the definition of the best geoidal model, together to the detection of data points with abnormal values are the main practical problems. A case study based on data set collected in Presidente Prudente, at São Paulo State, Brazil, will be presented in this paper. Some details of the GPS data collection and processing as well as of the selection of the polynomial parameters and geoidal model based in statistical analysis will be described. The results have shown RMS of the order of 40 mm.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	69 - 74
Cite this article:	Monico, João F. Galera, de Castro, André L. P., "Integration of GPS, Geoidal Model and Leveling Networks for Orthometric Heights Determination," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 69-74.
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