Comparison of Helmert and rigorous orthometric heights over Japan

• Material Type: 記事
• Title: Comparison of Helmert and rigorous orthometric heights over Japan
• Author/Editor: Patroba Achola Odera; Yoichi Fukuda
• Publication, Distribution, etc.: 日本 : Springer science+business media
• Publication Date: 2015-02-24
• Publication Date (W3CDTF): 2015-02-24
• Periodical title: EPS : Earth, Planets and Space
• No. or year of volume/issue: 67(27)
• Volume: 67(27)
• ISSN (Periodical Title): 1880-5981
• ISSN-L (Periodical Title): 1343-8832
• Text Language Code: eng
• DOI: 10.1186/s40623-015-0194-2; https://doi.org/10.1186/s40623-015-0194-2
• Persistent ID (NDL): info:ndljp/pid/9381154; https://dl.ndl.go.jp/pid/9381154
• Collection: 障害者向け資料
• Collection (Materials For Handicapped People:1): テキストデータ
• Collection (particular): 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > その他; https://dl.ndl.go.jp/collections/B00035
• Acquisition Basis: オンライン資料収集制度
• Date Accepted (W3CDTF): 2015-06-08T22:01:55+09:00
• Date Captured (W3CDTF): 2015-04-20
• Format (IMT): application/pdf
• Access Restrictions: 国立国会図書館内限定公開
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• Periodical Title (URI): https://www.earth-planets-space.com/content/67/February/2015
• Periodical Title (Persistent ID (NDL)): info:ndljp/pid/9227920; https://dl.ndl.go.jp/pid/9227920
• Data Provider (Database): 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

• Summary, etc.: The local vertical datum in Japan is based on the Helmert’s approximation of mean gravity along the plumbline. However, determination of a rigorous orthometric height requires that the integral-mean value of gravity along the plumbline between the geoid and the Earth surface has to be known precisely. An attempt has been made to obtain rigorous orthometric heights at 816 GPS/levelling points distributed over four main islands of Japan (Hokkaido, Honshu, Shikoku and Kyushu) by applying corrections to the Helmert orthometric heights. The corrections to Helmert orthometric heights are evaluated from the differences between the integral-mean gravity and the approximate mean gravity along the plumbline. The corrections to Helmert orthometric heights vary from −30.9 cm to 0.0 cm with a mean value of −0.4 cm and standard deviation of ±1.7 cm. An improved high-resolution gravimetric geoid model covering four main islands of Japan from our previous study is used to compare the consistency of the two height systems to a regionally defined gravimetric geoid model. The standard deviation of the differences between gravimetric and GPS/levelling geoid undulations is ±7.5 cm, when Helmert orthometric heights are used. The standard deviation of the differences between gravimetric and GPS/levelling geoid undulations reduces to ±7.3 cm, when rigorous orthometric heights are used. This indicates that rigorous orthometric heights are more consistent with the gravimetric geoid model than Helmert orthometric heights.
• DOI: 10.1186/s40623-015-0194-2; https://doi.org/10.1186/s40623-015-0194-2
• Access Restrictions: インターネット公開
• Rights (production): © 2015 Odera and Fukuda; licensee Springer. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited
• Related Material (URI): http://hdl.handle.net/2433/212435; http://id.ndl.go.jp/digimeta/9381154; https://dl.ndl.go.jp/pid/9381154
• Data Provider (Database): 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
• Original Data Provider (Database): 学術機関リポジトリデータベース; https://irdb.nii.ac.jp; 雑誌記事索引データベース; https://ndlsearch.ndl.go.jp; CiNii Articles
• Bibliographic ID (NDL): 9381154; http://id.ndl.go.jp/bib/9381154
• NAID: 120005756328