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. | Vietnam Journal of Marine Science and Technology 2023 23 3 265 277 Vietnam Academy of Science and Technology Vietnam Journal of Marine Science and Technology journal homepage jmst Evaluation of the precision of some new global Earth Gravitational Models in the East Vietnam Sea Do Van Mong1 Nguyen Van Sang2 Tran Tuan Dung3 4 Nguyen Thanh Le5 Khuong Van Long1 Nguyen Dinh Hai1 Tran Manh Cuong1 Nguyen Trong Dai1 Tran Tuan Duong3 1 Vietnam s People Naval Hydrographic and Oceanographic Department Hanoi Vietnam 2 Hanoi University of Mining and Geology Hanoi Vietnam 3 Institute of Marine Geology and Geophysics VAST Vietnam 4 Graduate University of Science and Technology VAST Vietnam 5 Le Quy Don University Hanoi Vietnam Received 23 Febuary 2023 Accepted 15 May 2023 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 mGal mGal mGal mGal mGal and 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 .
