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    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
    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
    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).

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