Accuracy assessment of the SRTM2gravity high-resolution topographic gravity model in geoid computation

• Published in: Survey review - Directorate of Overseas Surveys Vol. ahead-of-print; no. ahead-of-print; pp. 1 - 11
• Main Authors: Erol, Bihter, Çevikalp, Muhammed Raşit, Erol, Serdar
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 02.11.2023
• Subjects: Geoid model calculation; Global topographic gravity models; Gravity reduction; LSMSA method; SRTM2gravity model; Topographic correction
• ISSN: 0039-6265; 1752-2706
• DOI: 10.1080/00396265.2023.2183332

The accuracy of the SRTM2gravity high-resolution topographic gravity model is tested in this study. Complete Bouguer anomaly datasets calculated with classical formula in planar approximation and using the SRTM2gravity model in spherical approximation were compared in the study area. Two geoid models computed using free-air anomalies, which were restored from each Bouguer anomaly datasets, were compared to each other and they were validated at GPS/leveling points. In the mountainous part of the area, two geoid models differ by up to 4 cm. Following GPS/leveling validations, the geoid models provided nearly the same accuracy (∼4.2 cm). In conclusion, the accuracy of the SRTM2gravity model data was found sufficient to use in gravity reduction and it is recommended as a ready-to-use product in the area for gravity interpolation/gridding and geoid determination purposes.