| Determination of Geoid over South China Sea and Philippine Sea from Multi-satellite Altimetry Data |
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| 作者姓名： | Isaac Dadzie |
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| 作者单位： | Civil and |
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| 基金项目： | Funded by the National Natural Science Foundation of China (No.40474004). |
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| 摘 要： | A new computational procedure for derivation of marine geoid on a 2.5′×2.5′grid in a non-tidal system over the South China Sea and the Philippine Sea from multi-satellite altimeter sea surface heights is discussed. Single-and dual-satellite crossovers were performed, and components of deflections of the vertical were determined at the crossover positions using Sand-well's computational theory, and gridded onto a 2.5′×2.5′resolution grid by employing the Shepard's interpolation procedure. 2.5′×2.5′grid of EGM96-derived components of deflections of the vertical and geoid heights were then used as reference global geopotential model quantities in a remove-restore procedure to implement the Molodensky-like formula via 1D-FFT technique to predict the geoid heights over the South China Sea and the Philippine Sea from the gridded altimeter-derived components of deflec-tions of the vertical. Statistical comparisons between the altimeter-and the EGM96- derived geoid heights showed that there was a root-mean-square agreement of ±0.35 m between them in a region of less tectonically active geological structures. However, over areas of tectonically active structures such as the Philippine trench, differences of about -19.9 m were obtained.
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| 收稿时间： | 19 December 2006 |
Determination of Geoid over South China Sea and Philippine Sea from Multi-satellite Altimetry Data |
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| Isaac Dadzie.Determination of Geoid over South China Sea and Philippine Sea from Multi-satellite Altimetry Data[J].Geo-Spatial Information Science,2007,10(1):27-32. |
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| Authors: | Isaac Dadzie LI Jiancheng Civil and Geomatic Engineering Kwame Nkrumah University of Science and Technology Kumasi Ghana |
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| Institution: | (1) Civil and Geomatic Engineering, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana |
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| Abstract: | A new computational procedure for derivation of marine geoid on a 2.5′ × 2.5′ grid in a non-tidal system over the South China
Sea and the Philippine Sea from multi-satellite altimeter sea surface heights is discussed. Single-and dual-satellite crossovers
were performed, and components of deflections of the vertical were determined at the crossover positions using Sandwell’s
computational theory, and gridded onto a 2.5′ × 2.5′ resolution grid by employing the Shepard’s interpolation procedure. 2.5′
× 2.5′ grid of EGM96-derived components of deflections of the vertical and geoid heights were then used as reference global
geopotential model quantities in a remove-restore procedure to implement the Molodensky-like formula via 1D-FFT technique
to predict the geoid heights over the South China Sea and the Philippine Sea from the gridded altimeter-derived components
of deflections of the vertical. Statistical comparisons between the altimeter-and the EGM96-derived geoid heights showed that
there was a root-mean-square agreement of ±0.35 m between them in a region of less tectonically active geological structures.
However, over areas of tectonically active structures such as the Philippine trench, differences of about −19.9 m were obtained.
Funded by the National Natural Science Foundation of China (No.40474004). |
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| Keywords: | satellite altimetry sea surface height deflection of the vertical geoid height |
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