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    On the use of Australian geodetic datums in gravity field determination

    146668_24795_cordat.pdf (141.7Kb)
    Access Status
    Open access
    Authors
    Featherstone, Will
    Date
    1995
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Featherstone, Will. 1995. On the use of Australian geodetic datums in gravity field determination. Geomatics Research Australasia. 62: pp. 17-36.
    Source Title
    Geomatics Research Australasia
    ISSN
    13249983
    Faculty
    Department of Spatial Sciences
    Faculty of Science and Engineering
    WA School of Mines
    Remarks

    Geomantics Research Australasia has been succeeded by Journal of Spatial Science.

    URI
    http://hdl.handle.net/20.500.11937/42705
    Collection
    • Curtin Research Publications
    Abstract

    The treatment of gravity and terrain data prior to any gravimetric geoid computation is critical. If errors remain in the gravity or terrain data or both, these will propagate into any subsequently determined gravimetric geoid. The effects of horizontal and vertical datums on gravity reduction and, hence, the gravimetric geoid are discussed. Free-air gravity anomalies should be computed on the normal ellipsoid, after a coordinate transformation from the Australian Geodetic Datum, and incorporate a second-order free-air reduction. Their combined effect can reach -0.120mgal or an estimated -12cm in the resulting geoid. Also, the separation between the AHD and the geoid has an effect on the gravimetrically determined geoid. A combined oceanographic and levelling estimate implies that this effect can reach 0.216mgal and 22cm in the geoid. If this rigorous gravity data preparation is employed, centimetric improvements can be expected in all wavelengths of the resulting gravimetric geoid.

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