Improving EGM2008 by GPS and leveling data at local scale
Open Access
- 1 March 2014
- journal article
- Published by FapUNIFESP (SciELO) in Boletim de Ciências Geodésicas
- Vol. 20 (1), 3-18
- https://doi.org/10.1590/s1982-21702014000100001
Abstract
The development of the Earth Gravitational Model 2008 (EGM2008) model is a significant contribution for modeling the Earth's gravity and geoid. Recently, it can be confidently used versus geometric models following a simple refinement procedure. Several studies show that, EGM2008 can reach the accuracy of regional or local geoid models after modeling the differences between the GPS-leveling geoid heights and EGM2008 derived geoid heights at identified control points. The study focuses on a corrector surface fitting (CSF) approach based on radial basis functions (RBF) as improvement procedure for EGM2008. A detailed mathematical model and solution algorithm of the proposed model is given, and it has been applied in different test areas covering the city borders of Bursa, Konya, Denizli and Gaziantep in Turkey. Accuracy of the improved model was evaluated in scattered check points within test regions. The geoid heights of all check points obtained by GPS-leveling measurements were compared with the geoid heights obtained from improved model. The discrepancies between the calculated and measured geoid heights were analyzed and discussed.Keywords
This publication has 9 references indexed in Scilit:
- A precise gravimetric geoid model in a mountainous area with scarce gravity data: a case study in central TurkeyStudia Geophysica et Geodaetica, 2012
- The high-resolution gravimetric geoid of Italy: ITG2009Journal of African Earth Sciences, 2010
- Accuracy assessment of the available geoid models in AlgeriaComputers & Geosciences, 2007
- A procedure for modelling the differences between the gravimetric geoid model and GPS/levelling data with an example in the north part of AlgeriaComputers & Geosciences, 2006
- Comparison of the qualities of recent global and local gravimetric geoid models in IranStudia Geophysica et Geodaetica, 2005
- Radial basis functions for the multivariate interpolation of large scattered data setsJournal of Computational and Applied Mathematics, 2002
- Absolute and relative testing of gravimetric geoid models using Global Positioning System and orthometric height dataComputers & Geosciences, 2001
- Modified multiquadric methods for scattered data interpolation over a sphereComputer Aided Geometric Design, 1990
- Least squares prediction of gravity anomalies, geoidal undulations, and deflections of the vertical with multiquadric harmonic functionsGeophysical Research Letters, 1975