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    A re-evaluation of the offset in the Australian Height Datum between mainland Australia and Tasmania

    169511_43185_Tas_offset_resub1_final.pdf (305.6Kb)
    Access Status
    Open access
    Authors
    Featherstone, Will
    Filmer, Michael
    Date
    2012
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Filmer, M.S. and Featherstone, W.E. 2012. A re-evaluation of the offset in the Australian Height Datum between mainland Australia and Tasmania. Marine Geodesy. 35 (1): pp. 107-119.
    Source Title
    Marine Geodesy
    DOI
    10.1080/01490419.2011.634961
    ISSN
    01490419
    School
    Department of Spatial Sciences
    Remarks

    This is an electronic version of an article published in Filmer, M.S. and Featherstone, W.E. 2012. A re-evaluation of the offset in the Australian Height Datum between mainland Australia and Tasmania. Marine Geodesy. 35 (1): pp. 107-119. Marine Geodesy is available online at: www.tandfonline.com

    URI
    http://hdl.handle.net/20.500.11937/15509
    Collection
    • Curtin Research Publications
    Abstract

    The adoption of local mean sea level (MSL) at multiple tide-gauges as a zero reference level for the Australian Height Datum (AHD) has resulted in a spatially variable offset between the geoid and the AHD. This is caused primarily by sea surface topography (SSTop), which has also resulted in the AHD on the mainland being offset vertically from the AHD on the island of Tasmania. Errors in MSL observations at the 32 tide-gauges used in the AHD and the temporal bias caused by MSL observations over different time epochs also contribute to the offset, which previous studies estimate to be between ~+100 mm and ~+400 mm (AHD on the mainland above the AHD on Tasmania). This study uses five SSTop models (SSTMs), as well as GNSS and two gravimetric quasigeoid models, at tide-gauges/tide-gauge benchmarks to re-estimate the AHD offset, with the re-evaluated offset between −61 mm and +48 mm. Adopting the more reliable CARS2006 oceanographic-only SSTM, the offset is −12 ± 11 mm, an order of magnitude less than three previous studies that used geodetic data alone. This suggests that oceanographically derived SSTMs should be considered as a viable alternative to geodetic-only techniques when attempting to unify local vertical datums.

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