From Discrete Gravity Survey Data to a High-resolution Gravity Field Representation in the Nordic-Baltic Region

Silja Märdla, Jonas Ågren, Gabriel Strykowski, Tõnis Oja, Artu Ellmann, René Forsberg, Mirjam Bilker-Koivula, Ove Omang, Eimuntas Paršeliūnas, Ivars Liepinš, Jānis Kaminskis

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    Abstract

    The deduction of a regularly spaced gravity anomaly grid from scattered survey data is studied, addressing mainly two aspects: reduction of gravity to anomalies and subsequent interpolation by various methods. The problem is illustrated in a heterogeneous study area and contrasting test areas including mountains, low terrains, and a marine area. Provided with realistic error estimates, Least Squares Collocation interpolation of Residual Terrain Model anomalies yields the highest quality gravity grid. In most cases, the Bouguer reduction and other interpolation methods tested are equally viable. However, spline-based interpolation should be avoided in marine areas with trackwise survey data.
    Original languageEnglish
    JournalMarine Geodesy
    Volume40
    Issue number6
    Pages (from-to)416-453
    ISSN0149-0419
    DOIs
    Publication statusPublished - 2017

    Keywords

    • Bouguer anomaly
    • Gravity database
    • Gridding
    • Interpolation
    • Nordic Geodetic Commission (NKG
    • Regional geoid
    • Residual gravity anomaly
    • Residual Terrain Model (RTM) anomaly

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