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    GNSS-based heighting in Australia: current, emerging and future issues

    115311_115311.pdf (322.4Kb)
    Access Status
    Open access
    Authors
    Featherstone, Will
    Date
    2008
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Featherstone, William. 2008. GNSS-based heighting in Australia: current, emerging and future issues. Journal of Spatial Science. 53 (2): pp. 115-133.
    Source Title
    Journal of Spatial Science
    DOI
    10.1080/14498596.2008.9635153
    ISSN
    14498596
    Faculty
    Department of Spatial Sciences
    The Western Australian School of Mines
    Science and Engineering
    Remarks

    The Version of Record of this manuscript has been published and is available in Journal of Spatial Science, 2010. http://www.tandfonline.com/10.14498596.2008.9635153

    URI
    http://hdl.handle.net/20.500.11937/5874
    Collection
    • Curtin Research Publications
    Abstract

    Ellipsoidal heights, i.e., w.r.t. a geometrical Earth figure, determined from Global Navigation Satellite Systems (GNSS) are inherently their least accurate coordinate, due mainly to satellite geometry and atmospheric refraction. For most practical purposes, however, these GNSS-derived ellipsoidal heights have to be transformed to heights that relate to the Earth’s gravity field, which generally adds further uncertainty. The reduction in accuracy of the transformed height is due to errors in gravimetric quasi/geoid models, but this is compounded yet further in Australia and elsewhere because of the imperfect realisation of local vertical datums. This paper comments upon current, emerging and future issues with height determination on the Australian Height Datum (AHD) using GNSS. This comprises the reference frame used for GNSS ellipsoidal heights, theory- and data-driven inaccuracies in modelling the quasi/geoid, and deficiencies in the realisation of the AHD. While some of these issues will be redressed, in part, by the production of AUSGeoid2008 that is fitted to the AHD, there will always be the need to routinely apply checks on GNSS-derived heights in Australia, and elsewhere.

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