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    The effect of EGM2008-based normal, normal-orthometric and Helmert orthometric height systems on the Australian levelling network

    143135_143136.pdf (1.150Mb)
    Access Status
    Open access
    Authors
    Filmer, Michael
    Featherstone, Will
    Kuhn, Michael
    Date
    2010
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Filmer, M.S. and Featherstone, W.E. and Kuhn, M. 2010. The effect of EGM2008-based normal, normal-orthometric and Helmert orthometric height systems on the Australian levelling network. Journal of Geodesy. 84 (8): pp. 501-513.
    Source Title
    Journal of Geodesy
    DOI
    10.1007/s00190-010-0388-0
    ISSN
    09497714
    Faculty
    Department of Spatial Sciences
    Faculty of Science and Engineering
    WA School of Mines
    Remarks

    The original publication is available at : http://www.springerlink.com

    URI
    http://hdl.handle.net/20.500.11937/4685
    Collection
    • Curtin Research Publications
    Abstract

    This paper investigates the normal-orthometric correction used in the definition of the Australian Height Datum, and also computes and evaluates normal and Helmert orthometric corrections for the Australian National Levelling Network (ANLN). Testing these corrections in Australia is important to establish which height system is most appropriate for any new Australian vertical datum. An approximate approach to assigning gravity values to ANLN benchmarks (BMs) is used, where the EGM2008-modelled gravity field is used to "re-construct" observed gravity at the BMs. Network loop closures (for first- and second-order levelling) indicate reduced misclosures for all height corrections considered, particularly in the mountainous regions of south eastern Australia. Differences between Helmert orthometric and normal-orthometric heights reach 44 cm in the Australian Alps, and differences between Helmert orthometric and normal heights are about 26 cm in the same region. Normal orthometric heights differ from normal heights by up to 18 cm in mountainous regions >2,000 m. This indicates that the quasigeoid is not compatible with normal-orthometric heights in Australia.

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