Lacy de, María ClaraRodríguez Caderot, GraciaMarin, E.Ruíz, A.Borque, María JesúsGil, A. J.Biagi, L.2023-06-202023-06-2020010039-316910.1023/A:1021702514130https://hdl.handle.net/20.500.14352/57821Two 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 FS cm for another after fitting a plane to the geoid model.engjournal articlehttp://www.springerlink.com/content/nh5h578658vvwwwm/fulltext.pdfhttp://www.springerlink.comrestricted access528GPSlevellingQuasigeoidFast collocationRTM.Geodesia2504 Geodesia