Curtin University Homepage
  • Library
  • Help
    • Log in

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    AUSGeoid09: a more direct and more accurate model for converting ellipsoidal heights to AHD heights

    158290_35946_AUSGeoid09_BROWN.pdf (320.1Kb)
    Access Status
    Open access
    Authors
    Brown, N.
    Featherstone, Will
    Hu, G.
    Johnston, G.
    Date
    2011
    Type
    Journal Article
    
    Metadata
    Show full item record
    Abstract

    In an absolute sense, AUSGeoid09 is an order of magnitude more accurate than AUSGeoid98 at converting ellipsoidal heights to Australian Height Datum (AHD) heights and vice versa. Results of this study show AUSGeoid09 can be used to compute AHD heights from Global Navigation Satellite System (GNSS) ellipsoidal heights with an uncertainty of less than +/-0.03 m (one sigma). The improvement is largely due to the inclusion of a geometric component in AUSGeoid09 that accountsfor the spatially varying offset between a gravimetric quasigeoid model and the AHD. This geometric component was calculated using least squares collocation in cross validation mode and then added to the gravimetric quasigeoid. Although previous AUSGeoid models were used to convert GNSS ellipsoidal heights to the AHD and vice versa, none until now have accounted for the gravimetric quasigeoid to AHD offsets. This offset is a consequence of how the AHD was realised and has commonly resultedin misfits of ~0.5 m or more. When used with GNSS technology, AUSGeoid09 can replace the need for traditional third-order levelling (Class LC; 12 roo k) in many situations. Relative tests of AUSGeoid09 over a continent-wide set of over 20 million baselines showed that it can deliver better than Class LC tolerances in 99 percent of cases. The model accepts a user?s GDA94 latitude, longitude and ellipsoidal height and returns an AHD height and deviations of the vertical. AUSGeoid09 is now availablefree-of-charge on the Geoscience Australia website (http://www.ga.gov.au/geodesy/ausgeoid/nvalcomp.jsp).

    Citation
    Brown, Nicholas and Featherstone, Will and Hu, Guorong and Johnston, Gary. 2011. AUSGeoid09: a more direct and more accurate model for converting ellipsoidal heights to AHD heights. Journal of Spatial Science. 56 (1): pp. 27-37.
    Source Title
    Journal of Spatial Science
    DOI
    10.1080/14498596.2011.580498
    ISSN
    14498596
    School
    Department of Spatial Sciences
    Remarks

    The attached document is the author's version of an article published as: Brown, N.J. and Featherstone, W.E. and Hu, G. and Johnston, G.M. 2011. AUSGeoid09: a more direct and more accurate model for converting ellipsoidal heights to AHD heights. Journal of Spatial Science. 56 (1): pp. 27-37. Journal of Spatial Science is available online at: www.tandfonline.com.

    URI
    http://hdl.handle.net/20.500.11937/32454
    Collection
    • Curtin Research Publications

    Related items

    Showing items related by title, author, creator and subject.

    • The AUSGeoid09 model of the Australian Height Datum
      Featherstone, Will; Kirby, Jonathan; Hirt, Christian; Filmer, Michael; Claessens, Sten; Brown, N.; Hu, Guorong; Johnston, G. (2011)
      AUSGeoid09 is the new Australia-wide gravimetric quasigeoid model that has been a posteriori fitted to the Australian Height Datum (AHD) so as to provide a product that is practically useful for the more direct determination ...
    • GNSS-based heighting in Australia: current, emerging and future issues
      Featherstone, Will (2008)
      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 ...
    • AUSGeoid2020 combined gravimetric–geometric model: location-specific uncertainties and baseline-length-dependent error decorrelation
      Brown, N.; McCubbine, J.; Featherstone, Will; Gowans, N.; Woods, A.; Baran, I. (2018)
      AUSGeoid2020 is a combined gravimetric–geometric model (sometimes called a “hybrid quasigeoid model”) that provides the separation between the Geocentric Datum of Australia 2020 (GDA2020) ellipsoid and Australia’s national ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorsTitlesSubjectsDocument TypesThis CollectionIssue DateAuthorsTitlesSubjectsDocument Types

    My Account

    Log in

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Connect with Curtin

    • 
    • 
    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158