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    Estimates of the separation between the geoid and the quasigeoid over Australia

    Access Status
    Fulltext not available
    Authors
    Featherstone, Will
    Kirby, Jonathan
    Date
    1998
    Type
    Journal Article
    
    Metadata
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    Citation
    Featherstone, Will and Kirby, Jonathan. 1998. Estimates of the separation between the geoid and the quasigeoid over Australia. Geomatics Research Australasia. 68: pp. 79-90.
    Source Title
    Geomatics Research Australasia
    Additional URLs
    http://www.cage.curtin.edu.au/~will/gra68_05.pdf
    ISSN
    13249983
    Faculty
    Department of Spatial Sciences
    Faculty of Science and Engineering
    The Western Australian School of Mines
    URI
    http://hdl.handle.net/20.500.11937/4002
    Collection
    • Curtin Research Publications
    Abstract

    The geoid is the equipotential surface to which orthometric heights are referred, whereas the quasigeoid is the non-equipotential surface to which normal heights are referred. The Australian Height Datum is a hybrid of these vertical datum surfaces, being called a normal orthometric height system. It is therefore appropriate to determine the separation between these reference surfaces with a view to future gravimetric determinations of the geoid or quasigeoid of Australia. Using Bouguer gravity anomalies and a digital elevation model, the maximum separation between these surfaces has been estimated to be ~150 mm, with a standard deviation of 218 mm, in Australia. When compared to 129 Global Positioning System and Australian Height Datum control points across the continent, the inclusion of the quasigeoid-to-geoid separation term makes no difference to the standard deviations of the differences. This indicates that the determination of either the geoid or the quasigeoid is appropriate for the determination of Australian Height Datum heights from the Global Positioning System in Australia.

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