Evaluation of the precision of some new global Earth Gravitational Models in the East Vietnam Sea

Van Mong Do; Van Sang Nguyen; Tuan Dung Tran; Thanh Le Nguyen; Van Long Khuong; Dinh Hai Nguyen; Manh Cuong Tran; Trong Dai Nguyen; Tuan Duong Tran

doi:10.15625/1859-3097/18635

Author affiliations

Authors

Do Van Mong Vietnam’s People Naval Hydrographic and Oceanographic Department, Hanoi, Vietnam
Nguyen Van Sang Hanoi University of Mining and Geology, Hanoi, Vietnam
Tran Tuan Dung Institute of Marine Geology and Geophysics, VAST, Vietnam; Graduate University of Science and Technology, VAST, Vietnam
Nguyen Thanh Le Le Quy Don University, Hanoi, Vietnam
Khuong Van Long Vietnam’s People Naval Hydrographic and Oceanographic Department, Hanoi, Vietnam
Nguyen Dinh Hai Vietnam’s People Naval Hydrographic and Oceanographic Department, Hanoi, Vietnam
Tran Manh Cuong Vietnam’s People Naval Hydrographic and Oceanographic Department, Hanoi, Vietnam
Nguyen Trong Dai Vietnam’s People Naval Hydrographic and Oceanographic Department, Hanoi, Vietnam
Tran Tuan Duong Institute of Marine Geology and Geophysics, VAST, Vietnam

DOI:

https://doi.org/10.15625/1859-3097/18635

Keywords:

Earth Gravitational Model, gravity anomaly, East Vietnam Sea.

Abstract

This study is to evaluate the precision of some new global Earth Gravitational Models in the East Vietnam Sea, selecting the best model. The method and the program for calculating Free air gravity anomaly from the global earth gravitational model have been researched and developed. Evaluation of the precision of the models is done by comparing the models with ship-derived gravity anomalies. Data with anomalous signs are detected and removed when the deviation exceeds three times the root mean square deviation. The six global earth gravitational models were evaluated in the experimental section: EGM2008, EIGEN6-C4, GECO, SGG-UGM-1, XGM2019E, and SGG-UGM-2. The evaluation results show that: in the East Vietnam Sea, when compared with 35855 points of shipborne data, the above models respectively have standard deviations of: ±6.046 mGal, ±7.559 mGal, ±5.781 mGal,
±5.832 mGal, ±5.448 mGal, and ±5.236 mGal; all models have mean deviations from shipborne gravity anomalies of about +5 mGal; The correlation between the models and the shipborne data is quite good; The model SGG-UGM-2 has the highest precision. The Free air gravity anomalies from this model have also been calculated over the territorial waters of Vietnam in the form of a grid with a mesh size of
1' × 1'.

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