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dc.contributor.authorHwang, Cen_US
dc.date.accessioned2014-12-08T15:02:05Z-
dc.date.available2014-12-08T15:02:05Z-
dc.date.issued1997-01-01en_US
dc.identifier.issn0949-7714en_US
dc.identifier.urihttp://hdl.handle.net/11536/791-
dc.description.abstractThis paper analyzes several systematic errors affecting sea surface gradients derived from Seasat, Geosat/ERM, Geosat/GM, ERS-1/35d, ERS-1/GM and TOPEX/POSEIDON altimetry. Considering the data noises, the conclusion is: (1) only Seasat needs to correct for the non-geocentricity induced error, (2) only Seasat and Geosat/GM need to correct for the one cycle per revolution error, (3) only Seasat, ERS-1/GM and Geosat/GM need to correct for the tide model error; over shallow waters it is suggested to use a local tide model not solely from altimetry. The effects of the sea surface topography on gravity and geoid computations from altimetry are significant over areas with major oceanographic phenomena. In conclusion, sea surface gradient is a better data type than sea surface height. Sea surface gradients from altimetry, land gravity anomalies, ship gravity anomalies and elevation data were then used to calculate the geoid over Taiwan by least-squares collocation. The inclusion of sea surface gradients improves the geoid prediction by 27% when comparing the GPS-derived and the predicted geoidal heights, and by 30% when comparing the observed and the geoid-derived deflections of the vertical. The predicted geoid along coastal areas is accurate to 2 cm and can help GPS to do the third-order leveling.en_US
dc.language.isoen_USen_US
dc.titleAnalysis of some systematic errors affecting altimeter-derived sea surface gradient with application to geoid determination over Taiwanen_US
dc.typeArticleen_US
dc.identifier.journalJOURNAL OF GEODESYen_US
dc.citation.volume71en_US
dc.citation.issue2en_US
dc.citation.spage113en_US
dc.citation.epage130en_US
dc.contributor.department交大名義發表zh_TW
dc.contributor.department土木工程學系zh_TW
dc.contributor.departmentNational Chiao Tung Universityen_US
dc.contributor.departmentDepartment of Civil Engineeringen_US
dc.identifier.wosnumberWOS:A1997WH69800006-
dc.citation.woscount23-
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