GOCE Data for Local Geoid Enhancement

Matija Herceg, Per Knudsen, Carl Christian Tscherning

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    The GOCE gradients, having a spatially dense data distribution, may potentially provide better predictions of the regional gravity field than those obtained using a spherical harmonic Earth Geopotential Model. The aim of this study is to develop a methodologyto improve the use of GOCE gradients and to determine the Earth’s gravity field with better accuracy than by using global models, which have been truncated at a specific harmonicdegree and order. The method makes use of all available GOCE gradient data in addition to the global models and aims at improving the determination of Earth’s gravitational field in regional areas. Subsequently, the calculated geoid is used together with measurements of sea surface height in a calculation of the Mean Dynamic Topography.In regional geoid recovery from GOCE gradients, two methods are used, one of them being Least-Squares Collocation (LSC). The second method is developed as a part of this study, and it is based on the Reduced Point Mass (RPM) response. The results show that the RPM method and LSC method give very similar results when using the same data, i.e.the difference is insignificant when compared to the EGM2008 results. However, when all of the available GOCE gradient data are used with the RPM method, an improvement inthe gravitational field determination is achieved. The enhanced geoid by the RPM methodis then used for the improvement of the MDT in the North Atlantic region.
    Original languageEnglish
    Title of host publicationGravity, Geoid and Height Systems : Proceedings of the IAG Symposium GGHS2012
    EditorsUrs Marti
    Volume141
    PublisherSpringer
    Publication date2014
    Pages133-142
    ISBN (Print)978-3-319-10836-0
    ISBN (Electronic)978-3-319-10837-7
    DOIs
    Publication statusPublished - 2014
    EventIAG Symposium : GGHS 2012 - Venice, Italy
    Duration: 9 Oct 201212 Oct 2012

    Conference

    ConferenceIAG Symposium
    Country/TerritoryItaly
    CityVenice
    Period09/10/201212/10/2012
    SeriesGravity, Geoid and Heigh Systems

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