Evaluation of GOCE-based global gravity field models over Japan after the full mission using free-air gravity anomalies and geoid undulations

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dc.contributor.authorOdera, Patroba Achola
dc.contributor.authorFukuda, Yoichi
dc.date.accessioned2021-10-08T07:04:02Z
dc.date.available2021-10-08T07:04:02Z
dc.date.issued2017
dc.description.abstractThe performance of Gravity field and steady-state Ocean Circulation Explorer (GOCE) global gravity field models (GGMs), at the end of GOCE mission covering 42 months, is evaluated using geoid undulations and free-air gravity anomalies over Japan, including six sub-regions (Hokkaido, north Honshu, central Honshu, west Honshu, Shikoku and Kyushu). Seventeen GOCE-based GGMs are evaluated and compared with EGM2008. The evaluations are carried out at 150, 180, 210, 240 and 270 spherical harmonics degrees. Results show that EGM2008 performs better than GOCE and related GGMs in Japan and three sub-regions (Hokkaido, central Honshu and Kyushu). However, GOCE and related GGMs perform better than EGM2008 in north Honshu, west Honshu and Shikoku up to degree 240. This means that GOCE data can improve geoid model over half of Japan. The improvement is only evident between degrees 150 and 240 beyond which EGM2008 performs better than GOCE GGMs in all the six regions. In general, the latest GOCE GGMs (releases 4 and 5) perform better than the earlier GOCE GGMs (releases 1, 2 and 3), indicating the contribution of data collected by GOCE in the last months before the mission ended on 11 November 2013. The results indicate that a more accurate geoid model over Japan is achievable, based on a combination of GOCE, EGM2008 and terrestrial gravity data sets.
dc.identifier.apacitationOdera, P. A., & Fukuda, Y. (2017). Evaluation of GOCE-based global gravity field models over Japan after the full mission using free-air gravity anomalies and geoid undulations. <i>Earth, Planets and Space</i>, 69(1), 174 - 177. http://hdl.handle.net/11427/34411en_ZA
dc.identifier.chicagocitationOdera, Patroba Achola, and Yoichi Fukuda "Evaluation of GOCE-based global gravity field models over Japan after the full mission using free-air gravity anomalies and geoid undulations." <i>Earth, Planets and Space</i> 69, 1. (2017): 174 - 177. http://hdl.handle.net/11427/34411en_ZA
dc.identifier.citationOdera, P.A. & Fukuda, Y. 2017. Evaluation of GOCE-based global gravity field models over Japan after the full mission using free-air gravity anomalies and geoid undulations. <i>Earth, Planets and Space.</i> 69(1):174 - 177. http://hdl.handle.net/11427/34411en_ZA
dc.identifier.issn1343-8832
dc.identifier.issn1880-5981
dc.identifier.ris TY - Journal Article AU - Odera, Patroba Achola AU - Fukuda, Yoichi AB - The performance of Gravity field and steady-state Ocean Circulation Explorer (GOCE) global gravity field models (GGMs), at the end of GOCE mission covering 42 months, is evaluated using geoid undulations and free-air gravity anomalies over Japan, including six sub-regions (Hokkaido, north Honshu, central Honshu, west Honshu, Shikoku and Kyushu). Seventeen GOCE-based GGMs are evaluated and compared with EGM2008. The evaluations are carried out at 150, 180, 210, 240 and 270 spherical harmonics degrees. Results show that EGM2008 performs better than GOCE and related GGMs in Japan and three sub-regions (Hokkaido, central Honshu and Kyushu). However, GOCE and related GGMs perform better than EGM2008 in north Honshu, west Honshu and Shikoku up to degree 240. This means that GOCE data can improve geoid model over half of Japan. The improvement is only evident between degrees 150 and 240 beyond which EGM2008 performs better than GOCE GGMs in all the six regions. In general, the latest GOCE GGMs (releases 4 and 5) perform better than the earlier GOCE GGMs (releases 1, 2 and 3), indicating the contribution of data collected by GOCE in the last months before the mission ended on 11 November 2013. The results indicate that a more accurate geoid model over Japan is achievable, based on a combination of GOCE, EGM2008 and terrestrial gravity data sets. DA - 2017 DB - OpenUCT DP - University of Cape Town IS - 1 J1 - Earth, Planets and Space LK - https://open.uct.ac.za PY - 2017 SM - 1343-8832 SM - 1880-5981 T1 - Evaluation of GOCE-based global gravity field models over Japan after the full mission using free-air gravity anomalies and geoid undulations TI - Evaluation of GOCE-based global gravity field models over Japan after the full mission using free-air gravity anomalies and geoid undulations UR - http://hdl.handle.net/11427/34411 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34411
dc.identifier.vancouvercitationOdera PA, Fukuda Y. Evaluation of GOCE-based global gravity field models over Japan after the full mission using free-air gravity anomalies and geoid undulations. Earth, Planets and Space. 2017;69(1):174 - 177. http://hdl.handle.net/11427/34411.en_ZA
dc.language.isoeng
dc.publisher.departmentSchool of Architecture, Planning and Geomatics
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.sourceEarth, Planets and Space
dc.source.journalissue1
dc.source.journalvolume69
dc.source.pagination174 - 177
dc.source.urihttps://dx.doi.org/10.1186/s40623-017-0716-1
dc.subject.otherGeoid model
dc.subject.otherGravity
dc.subject.otherGPS/levelling
dc.subject.otherGOCE
dc.subject.otherEGM2008
dc.titleEvaluation of GOCE-based global gravity field models over Japan after the full mission using free-air gravity anomalies and geoid undulations
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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