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    Yet more evidence for a north-south slope in the Australian height datum

    117361_117361.pdf (113.0Kb)
    Access Status
    Open access
    Authors
    Featherstone, Will
    Date
    2006
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Featherstone, Will. 2006. Yet more evidence for a north-south slope in the Australian height datum. Journal of Spatial Science. 51 (2): pp. 1-6.
    Source Title
    Journal of Spatial Science
    DOI
    10.1080/14498596.2006.9635076
    ISSN
    14498596
    Faculty
    Department of Spatial Sciences
    Faculty of Science and Engineering
    The Western Australian School of Mines
    Remarks

    The Version of Record of this manuscript has been published and is available in Journal of Spatial Science, 2006. http://www.tandfonline.com/10.1080/14498596.2006.9635076

    URI
    http://hdl.handle.net/20.500.11937/39721
    Collection
    • Curtin Research Publications
    Abstract

    The results here add to the body of evidence for a systematic north-south error in the Australian Height Datum (AHD). Previous studies based solely on Global Positioning System (GPS) and a gravimetric geoid model have suffered from the 'inseparability problem', where it is not possible to discriminate between errors in the AHD and geoid. Instead, this study compares horizontal gradients of the AUSGeoid98 regional gravimetric geoid model with totally independent astrogeodetically observed vertical deflections at 741 Laplace stations across Australia. These comparisons do not show any significant latitude-dependent residuals, thus significantly reducing the likelihood of a north-south slope in AUSGeoid98. Subsequently using GPS and AUSGeoid98, now that the inseparability problem has been addressed, there is very compelling evidence for a real north-south slope of ~1.5m in the AHD.

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