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    A WGS84-AHD Profile over the Darling Fault: Western Australia

    146551_24772_owen2.pdf (111.6Kb)
    Access Status
    Open access
    Authors
    Friedlieb, Owen
    Featherstone, Will
    Dentith, M.
    Date
    1997
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Friedlieb, Owen and Featherstone, Will and Dentith, Michael. 1997. A WGS84-AHD Profile over the Darling Fault: Western Australia. Geomatics Research Australasia. 67: pp. 17-32.
    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/20.500.11937/43124
    Collection
    • Curtin Research Publications
    Abstract

    The Darling Fault near Perth in Western Australia causes a steep geoid gradient of approximately 100mm/km. Existing gravimetric geoid models cannot currently recover this rapidly varying geoid undulation with sufficient accuracy so as to allow the accurate determination of Australian Height Datum (AHD) heights using the Global Positioning System (GPS). As such, the geometrical approach to determine the separation between the AHD and World Geodetic System 1984 (WGS84) ellipsoid is expected to offer improved GPS height determination in this region. A network of 45 carrier-phase GPS baselines, made at 14 first-order AHD benchmarks at ~3km intervals along a 30km profile across the Darling Fault near Perth, was observed in order to test this hypothesis. Several GPS network adjustment strategies were implemented which constrained existing height information in different ways. Due to the poor knowledge of the position of the geoid in this region, the most precise network adjustment used only one fixed ellipsoidal height and all other known stations were held fixed in latitude and longitude only. When the geometrical approach was compared with the results of existing gravimetric geoid solutions, it offers a superior means of determining heights from GPS. However, the geometrical method only satisfies third-order specifications in 5 of the 12 cases tested in this region of the Darling Fault.

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