Özet
The paper deals with geoid modeling using the least-squares modification of the Stokes' and Hotine's formulae using gridded and non-gridded terrestrial gravity data over the Auvergne test area (France). Differently from the conventional way of using gridded gravity data, this study utilizes non-gridded data as the input to the geoid modeling and compare the differences between the computational approaches in terms of the geoid model accuracies. For this purpose, the calculated gravimetric geoid models are validated at high-accuracy GNSS/leveling benchmarks provided in the test dataset. The geoid models computed using the grid gravity data yielded 3.8 cm and 4.0 cm accuracies before fitting for Hotine's and Stokes' methods, whilst the evaluation of the geoid models with non-gridded data yielded 6.6 cm and 5.7 cm, respectively. The numerical comparisons of the different geoid models are presented and discussed in detail.
| Orijinal dil | İngilizce |
|---|---|
| Makale numarası | 104909 |
| Dergi | Computers and Geosciences |
| Hacim | 156 |
| DOI'lar | |
| Yayın durumu | Yayınlandı - Kas 2021 |
Bibliyografik not
Publisher Copyright:© 2021 Elsevier Ltd
Finansman
This research was carried out as part of the prime author's graduate thesis study (Council of Higher Education database no. 513347), which was prepared and successfully defended at Istanbul Technical University, Graduate School of Science Engineering and Technology. Erasmus+ student exchange program is thanked for funding the first author's studies in Tallinn University of Technology . The third author is partly supported by the Estonian Research Council grant PRG330. The assistance and discussions provided by researcher M. Serkan Işık, Istanbul Technical University and PhD Silja Märdla, Tallinn University of Technology are greatly appreciated. The computational modules for the calculations are developed in Matlab environment. The ArcPro software by ESRI is used for the calculation of Voronoi polygons. The best performing geoid model calculated in this study is available online from the Geoid Repository of the International Service for the Geoid ( ISG 2021 ). The Editor and four anonymous reviewers are thanked for their constructive suggestions on the manuscript. This research was carried out as part of the prime author's graduate thesis study (Council of Higher Education database no. 513347), which was prepared and successfully defended at Istanbul Technical University, Graduate School of Science Engineering and Technology. Erasmus+ student exchange program is thanked for funding the first author's studies in Tallinn University of Technology. The third author is partly supported by the Estonian Research Council grant PRG330. The assistance and discussions provided by researcher M. Serkan Işık, Istanbul Technical University and PhD Silja Märdla, Tallinn University of Technology are greatly appreciated. The computational modules for the calculations are developed in Matlab environment. The ArcPro software by ESRI is used for the calculation of Voronoi polygons. The best performing geoid model calculated in this study is available online from the Geoid Repository of the International Service for the Geoid (ISG 2021). The Editor and four anonymous reviewers are thanked for their constructive suggestions on the manuscript.
| Finansörler | Finansör numarası |
|---|---|
| Graduate School of Science Engineering and Technology | |
| International Service for the Geoid | ISG 2021 |
| Economic and Social Research Institute | |
| Eesti Teadusagentuur | PRG330 |
| Tallinna Tehnikaülikool | |
| Istanbul Teknik Üniversitesi |