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    On the accuracy of modified Stokes's integration in high-frequency gravimetric geoid determination

    Access Status
    Fulltext not available
    Authors
    Novak, P.
    Vanicek, P.
    Veronneau, M.
    Holmes, S.
    Featherstone, Will
    Date
    2001
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Novak, P. and Vanicek, P. and Veronneau, M. and Holmes, S.A. and Featherstone, W.E.. 2001. On the accuracy of modified Stokes's integration in high-frequency gravimetric geoid determination. Journal of Geodesy 74 (9): 644-654.
    Source Title
    Journal of Geodesy
    DOI
    10.1007/s001900000126
    Faculty
    Division of Resources and Environment
    Department of Spatial Sciences
    Remarks

    Originally published in Journal of Geodesy 2001 74(9) pp.644-654.

    Copyright Springer-Verlag

    The original article is available at springerlink.com.

    URI
    http://hdl.handle.net/20.500.11937/41266
    Collection
    • Curtin Research Publications
    Abstract

    Two numerical techniques are used in recent regional high-frequency geoid computations in Canada: discrete numerical integration and fast Fourier transform. These two techniques have been tested for their numerical accuracy using a synthetic gravity field. The synthetic field was generated by artificially extending the EGM96 spherical harmonic coefficients to degree 2160, which is commensurate with the regular 5' geographical grid used in Canada. This field was used to generate self-consistent sets of synthetic gravity anomalies and synthetic geoid heights with different degree variance spectra, which were used as control on the numerical geoid computation techniques. Both the discrete integration and the fast Fourier transform were applied within a 6: spherical cap centered at each computation point. The effect of the gravity data outside the spherical cap was computed using the spheroidal Molodenskij approach. Comparisons of these geoid solutions with the synthetic geoid heights over western Canada indicate that the high-frequency geoid can be computed with an accuracy of approximately 1 cm using the modified Stokes technique, with discrete numerical integration giving a slightly, though not significantly, better result than fast Fourier transform.

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