Keywords
Satellite-derived gravity anomaly
ship-measured gravity anomaly
fitting Dị thường trọng lực vệ tinh
dị thường trọng lực trực tiếp
làm khớp.
ship-measured gravity anomaly
fitting Dị thường trọng lực vệ tinh
dị thường trọng lực trực tiếp
làm khớp.
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How to Cite
Nguyen, V. S., & Dinh, X. M. (2021). Fitting satellite-derived gravity anomalies with ship-measured gravity anomalies . Journal of Geodesy and Cartography, (48), 8–15. https://doi.org/10.54491/jgac.2021.48.243
Abstract
The satellite-derived gravity anomalies always deviate from the ship-measured gravity anomalies. Before use, it is necessary to fit them together. Collocation method allows fitting of these two types of gravity anomalies. Before fitting, it is necessary to correct the system deviation. Experimental calculations made the DTU15GRAV satellite-derived anomalies fit with 3017 ship- measured gravity anomalies points in the middle East Sea with latitude from 7.50 to 14.50; longitude from 109.50 to 117.50. Fitting results were compared with 1065 ship-measured gravity anomalies points to evaluate accuracy. Evaluation results show that, after the fitting, the accuracy of satellite-derived gravity anomalies increased from ± 7.23 mGal to ± 5.07 mGal
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