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A Gravimetric Geoid Computation and Comparison with GPS Results in Northern Andalusia (Spain) |
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| Authors: | De Lacy M.C. Rodríguez-Caderot G. Marín E. Ruiz A. Borque M.J. Gil A.J. Biagi L. |
| Affiliation: | (1) Dept. Astronomía y Geodesia, Facultad de Ciencias Matemáticas, Universidad Complutense de Madrid, Madrid, Spain;(2) Ciudad Universitaria s/n, 28040 Madrid, Spain;(3) Dpto. Ingeniería Cartográfica, Geodésica y Fotogrametría, Escuela Politécnica Superior, Universidad de Jaén, Jaén, Spain;(4) Virgen de la Cabeza 2, 23009 Jaén, Spain;(5) Facoltá di Ingegneria di Como, Politecnico di Milano, Como, Italy;(6) Via Valleggio 11, 22100 Como, Italy |
| Abstract: | Two new GPS surveys have been carried out to check the accuracy of an existing gravimetric geoid in a test area located in northern Andalusia (Spain). The fast collocation method and the remove-restore procedure have been used for the computation of the quasigeoid model. The Spanish height system is based on orthometric heights, so the gravimetrically determined quasigeoid has been transformed to a geoid model and then compared to geoid undulations provided by GPS and levelling at benchmarks belonging to the Spanish first-order levelling network. The discrepancies between the gravimetric solution and GPS/levelling undulations amount to ±2 cm for one survey and ±5 cm for another after fitting a plane to the geoid model. |
| Keywords: | GPS levelling quasigeoid fast collocation RTM |
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