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    A Geodetic Approach to Gravity Reduction for Geophysics

    146545_24764_comgeo2.pdf (101.5Kb)
    Access Status
    Open access
    Authors
    Featherstone, Will
    Dentith, M.
    Date
    1997
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Featherstone, W.E. and Dentith, M.C. 1997. A Geodetic Approach to Gravity Reduction for Geophysics. Computers and Geosciences 23 (10): pp. 1063-1070.
    Source Title
    Computers and Geosciences
    DOI
    10.1016/S0098-3004(97)00092-7
    ISSN
    00983004
    Faculty
    Department of Exploration Geophysics
    Faculty of Science and Engineering
    WA School of Mines
    School
    Department of Spatial Sciences
    Remarks

    Copyright © 1997 Elsevier B.V. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/35661
    Collection
    • Curtin Research Publications
    Abstract

    The currently adopted approach to reduce observed gravity data for geophysical purposes includes several approximations. These were originally used to reduce computational effort, but have remained standard practice even though the required computing power is now readily available. In contrast, more precise gravity reductions are routinely employed in physical geodesy. The difference between simple Bouguer gravity anomalies derived using the geophysical and geodetic approaches can reach several tens of μms-2. The geodetic reductions include a more accurate calculation of normal gravity as a function of latitude, and a free air correction that accounts for the non-sphericity of the figure of the Earth. Also important, especially given the advent of Global Positioning System coordination of gravity surveys, is the need to ensure that the correct vertical and horizontal coordinate systems are used for the gravity reduction procedure. Errors associated with the use of non-geocentric horizontal coordinates and ellipsoidal heights are significant when compared with the accuracy of an individual gravity measurement. A generalised gravity reduction program and a coordinate transformation program are presented which can be employed to reduce geophysical data in a geodetic manner.

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