Modelling the local geoid of East Kalimantan from combination of airborne and terrestrial gravity data using the KTH method
Year: 2026
Type: article
Abstract: This research aims to determine the gravimetric geoid using the KTH method for East Kalimantan, where Indonesia’s new capital city is located. The geoid of East Kalimantan was calculated from a combination of airborne gravity data, terrestrial gravity data, DTU17 for the sea area, anomalies of EGM2008 degree 2190, SRTM15+, and GGM from EGM2008 degree 360. The geoid modelling is performed using LSMSSOFT software with a grid interval of 0.01˚. The evaluation of capsize variations includes 14 variations: 0.1˚, 0.2˚, 0.3˚, 0.4˚, 0.5˚, 0.6˚, 0.7˚, 0.8˚, 0.9˚, 1˚, 1.2˚, 1.3˚, 1.5˚, and 2˚. The KTH geoid was evaluated using 264 GNSS-Levelling data points. The best accuracy was obtained at a capsize of 0.6˚ with a standard deviation value of 0.0532 m. The accuracy of the geoid model after shifting to the tidal benchmark (BM) is 0.0526 m. A comparison with the recent national geoid model of INAGEOID2020 v.2 obtained using the Remove-Restore method, which has a standard deviation of 0.0588 m, shows that the accuracy of the KTH method geoid model is higher, with a precision improvement of 0.0062 m.
Source: Geodesy and Cartography
Authors: Sukma Nur Oktavia, Leni Sophia Heliani
Language: English
Subfield: Oceanography
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7143984683