Determination of gravity anomalies in the waters of Viet Nam and around using CryoSat-2 space altimetry
| Autor: | V.S. Nguyen, Yu.M. Neiman, T.D. Tran, T.T. Phung, T.T.H. Le, P.S. Nguyen |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Geodesy and Cartography. 983:19-27 |
| ISSN: | 2587-8492 0016-7126 |
| DOI: | 10.22389/0016-7126-2022-983-5-19-27 |
| Popis: | The purpose of this study is to determine marine gravity anomalies with high accuracy using the CryoSat-2 satellite altimetry data in the Middle Vietnamese Sea and the adjacent territory. For this, the mentioned data and the process of determining gravity anomalies from the CryoSat-2 data were analyzed. The record from 818 GNSS-leveling points in Vietnam were used to evaluate and select the best global gravity field model for use in the calculation process. The findings from 31 gauge tidal were also used to assess and select the best mean dynamic topography model for the study area. Marine gravity anomalies in the study area were calculated using data from the CryoSat-2 satellite altimeter at 72 483 measurement points. The calculated results are compared with the ship-derived gravity anomalies at 1025 measurement points for assessment. The research results show that of the Earth Geopotential Model EIGEN6C4 and the Mean Dynamic Topography Model DTU15MDT are the most suitable for the research area. The accuracy of satellite-derived gravity anomalies, calculated from the CryoSat-2 satellite altimetry data in the study area, reaches ±1,18 mGal. Compared to the available results in the study area, this accuracy is the highest. |
| Databáze: | OpenAIRE |
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