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    Comparison of Remove-Compute-Restore and University of New Brunswick Techniques to Geoid Determination over Australia, and Inclusion of Wiener-Type Filters in Reference Field Contribution

    Access Status
    Fulltext not available
    Authors
    Featherstone, Will
    Holmes, S.
    Kirby, Jon
    Kuhn, Michael
    Date
    2004
    Type
    Journal Article
    
    Metadata
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    Citation
    Featherstone, W E and Holmes, S A and Kirby, J F and Kuhn, M. 2004. Comparison of Remove-Compute-Restore and University of New Brunswick Techniques to Geoid Determination over Australia, and Inclusion of Wiener-Type Filters in Reference Field Contribution. Journal of Surveying Engineering 130 (1): 40-47.
    Source Title
    Journal of Surveying Engineering
    DOI
    10.1061/(ASCE)0733-9453(2004)130:1(40)
    Faculty
    Division of Resources and Environment
    Department of Spatial Sciences
    School
    Western Australian Centre for Geodesy
    URI
    http://hdl.handle.net/20.500.11937/32343
    Collection
    • Curtin Research Publications
    Abstract

    The commonly adopted remove-compute-restore (RCR) technique for regional gravimetric geoid determination uses the maximum degree of a combined global geopotential model and regional gravity data via the spherical Stokes integral. The University of New Brunswick's (UNB) technique involves the use of a deterministically modified integration kernel, a degree-20 satellite-only reference field, integration of high-frequency terrestrial gravity anomalies over a spherical cap of 6 radius about each computation point, and a separate computation of the truncation bias used Degrees 21 120 of a combined global geopotential model. Both approaches are tested over Australia and the resulting geoid models compared with a nationwide dataset of 1,013 Global Positioning System (GPS)-leveled points, and with the most recent Australian geoid model, AUSGeoid98. A subsequent experiment considers the commission errors in the reference field used by applying a Wiener-type filter based on the global degree- and error-degree variances of the EGM96 combined and EGM96S satellite-only global geopotential models. The theoretical basis of this adapted approach will be presented, together with comparisons of the resulting geoid solution with the 1,013 GPS-leveling data, UNB, RCR, and AUSGeoid98 solutions.

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