Abstract
In 1998, the Colombian gravimetric geoid model GEOCOL98 was determined using the remove/restore technique. The local component was computed from Free Air anomalies processed by Stokes’ formula, and the global component was calculated from the EGM96 geopotential model. GEOCOL98 has been used in Colombia to derive “classical” heights referred to the Buenaventura Datum from GPS information. However, big discrepancies have been found in mountain areas between the undulations corresponding to the GPS heights combined with spirit leveling and those derived from the gravimetric model. In order to reduce these discrepancies and to enable the combination of GPS data with the existing leveling networks, a quasigeoid model (GEOCOL2001) was calculated using Molodensky’s theory. Terrestrial and aerial gravity data over land and satellite altimetry over the adjacent marine areas were used to estimate Faye anomalies. The obtained height anomalies are compared with the differences between GPS ellipsoidal heights and leveled heights in selected benchmarks. The results show smaller amplitudes in the residuals and an improved accuracy in the converted heights.
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Martínez, W., Sánchez, L. (2002). Improving the Quasigeoid Model in Colombia. In: Drewes, H., Dodson, A.H., Fortes, L.P.S., Sánchez, L., Sandoval, P. (eds) Vertical Reference Systems. International Association of Geodesy Symposia, vol 124. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-04683-8_29
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DOI: https://doi.org/10.1007/978-3-662-04683-8_29
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