Evaluating Accuracy of HY-2A/GM-Derived Gravity Data With the Gravity-Geologic Method to Predict Bathymetry
For the first time, HY-2A/GM-derived gravity anomalies determined with the least-squares collocation method and ship-borne bathymetry released from the National Centers for Environmental Information (NCEI) are used to predict bathymetry with the gravity-geologic method (GGM) over three test areas lo...
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doaj-87d64dbb91ea4218bad173a72ceb3fff2021-04-21T04:51:41ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632021-04-01910.3389/feart.2021.636246636246Evaluating Accuracy of HY-2A/GM-Derived Gravity Data With the Gravity-Geologic Method to Predict BathymetryZhijie Wei0Jinyun Guo1Chengcheng Zhu2Jiajia Yuan3Xiaotao Chang4Bing Ji5College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, ChinaCollege of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, ChinaCollege of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, ChinaCollege of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, ChinaLand Satellite Remote Sensing Application Center of MNR, Beijing, ChinaDepartment of Navigation Engineering, Naval University of Engineering, Wuhan, ChinaFor the first time, HY-2A/GM-derived gravity anomalies determined with the least-squares collocation method and ship-borne bathymetry released from the National Centers for Environmental Information (NCEI) are used to predict bathymetry with the gravity-geologic method (GGM) over three test areas located in the South China Sea (105–122°E, 2–26°N). The iterative method is used to determine density contrasts (1.4, 1.5, and 1.6 g/cm3) between seawater and ocean bottom topography, improving the accuracy of GGM bathymetry. The results show that GGM bathymetry is the closest to ship-borne bathymetry at check points, followed by SRTM15+V2.0 model and GEBCO 2020 model. It is found that in a certain range, the relative accuracy of GGM bathymetry tends to improve with the increase of depth. Different geological structures affect the accuracy of GGM bathymetry. In addition, the influences of gravity anomalies and data processing method on GGM bathymetry are analyzed. Our assessment result suggests that GGM can be widely applied to bathymetry prediction and that HY-2A/GM-derived gravity data are feasible with good results in calculating ocean depth.https://www.frontiersin.org/articles/10.3389/feart.2021.636246/fullgravity-geologic methodmarine gravity anomaliesSouth China Seadensity contrastocean depthgeological structure |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Zhijie Wei Jinyun Guo Chengcheng Zhu Jiajia Yuan Xiaotao Chang Bing Ji |
spellingShingle |
Zhijie Wei Jinyun Guo Chengcheng Zhu Jiajia Yuan Xiaotao Chang Bing Ji Evaluating Accuracy of HY-2A/GM-Derived Gravity Data With the Gravity-Geologic Method to Predict Bathymetry Frontiers in Earth Science gravity-geologic method marine gravity anomalies South China Sea density contrast ocean depth geological structure |
author_facet |
Zhijie Wei Jinyun Guo Chengcheng Zhu Jiajia Yuan Xiaotao Chang Bing Ji |
author_sort |
Zhijie Wei |
title |
Evaluating Accuracy of HY-2A/GM-Derived Gravity Data With the Gravity-Geologic Method to Predict Bathymetry |
title_short |
Evaluating Accuracy of HY-2A/GM-Derived Gravity Data With the Gravity-Geologic Method to Predict Bathymetry |
title_full |
Evaluating Accuracy of HY-2A/GM-Derived Gravity Data With the Gravity-Geologic Method to Predict Bathymetry |
title_fullStr |
Evaluating Accuracy of HY-2A/GM-Derived Gravity Data With the Gravity-Geologic Method to Predict Bathymetry |
title_full_unstemmed |
Evaluating Accuracy of HY-2A/GM-Derived Gravity Data With the Gravity-Geologic Method to Predict Bathymetry |
title_sort |
evaluating accuracy of hy-2a/gm-derived gravity data with the gravity-geologic method to predict bathymetry |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Earth Science |
issn |
2296-6463 |
publishDate |
2021-04-01 |
description |
For the first time, HY-2A/GM-derived gravity anomalies determined with the least-squares collocation method and ship-borne bathymetry released from the National Centers for Environmental Information (NCEI) are used to predict bathymetry with the gravity-geologic method (GGM) over three test areas located in the South China Sea (105–122°E, 2–26°N). The iterative method is used to determine density contrasts (1.4, 1.5, and 1.6 g/cm3) between seawater and ocean bottom topography, improving the accuracy of GGM bathymetry. The results show that GGM bathymetry is the closest to ship-borne bathymetry at check points, followed by SRTM15+V2.0 model and GEBCO 2020 model. It is found that in a certain range, the relative accuracy of GGM bathymetry tends to improve with the increase of depth. Different geological structures affect the accuracy of GGM bathymetry. In addition, the influences of gravity anomalies and data processing method on GGM bathymetry are analyzed. Our assessment result suggests that GGM can be widely applied to bathymetry prediction and that HY-2A/GM-derived gravity data are feasible with good results in calculating ocean depth. |
topic |
gravity-geologic method marine gravity anomalies South China Sea density contrast ocean depth geological structure |
url |
https://www.frontiersin.org/articles/10.3389/feart.2021.636246/full |
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