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    A Synthetic Earth Gravity Model Designed Specifically for Testing Regional Gravimetric Geoid Determination Algorithms

    117355_117355.pdf (797.8Kb)
    Access Status
    Open access
    Authors
    Baran, Ireneusz
    Kuhn, Michael
    Claessens, Sten
    Featherstone, Will
    Holmes, S.
    Vanicek, P.
    Date
    2006
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Baran, I. and Kuhn, M. and Claessens, S.J. and Featherstone, W.E. and Holmes, S.A. and Vanicek, P. 2006. A synthetic Earth gravity model designed specifically for testing regional gravimetric geoid determination algorithms. Journal of Geodesy. 80 (1): 1-16.
    Source Title
    Journal of Geodesy
    DOI
    10.1007/s00190-005-0002-z
    ISSN
    09497714
    Faculty
    Department of Spatial Sciences
    Faculty of Science and Engineering
    WA School of Mines
    Remarks

    The final publication is available at Springer via http://dx.doi.org/10.1007/s00190-005-0002-z

    URI
    http://hdl.handle.net/20.500.11937/8154
    Collection
    • Curtin Research Publications
    Abstract

    A synthetic [simulated] Earth gravity model (SEGM) of the geoid, gravity and topography has been constructed over Australia specifically for validating regional gravimetric geoid determination theories, techniques and computer software. This regional high-resolution (1-arc-min by 1-arc-min) Australian SEGM (AusSEGM) is a combined source and effect model. The long-wavelength effect part (up to and including spherical harmonic degree and order 360) is taken from an assumed errorless EGM96 global geopotential model. Using forward modelling via numerical Newtonian integration, the short-wavelength source part is computed from a high-resolution (3-arc-sec by 3-arc-sec) synthetic digital elevation model (SDEM), which is a fractal surface based on the GLOBE v1 DEM. All topographic masses are modelled with a constant mass-density of 2,670 kg/m3. Based on these input data, gravity values on the synthetic topography (on a grid and at arbitrarily distributed discrete points) and consistent geoidal heights at regular 1-arc-min geographical grid nodes have been computed. The precision of the synthetic gravity and geoid data (after a first iteration) is estimated to be better than 30 μ Gal and 3 mm, respectively, which reduces to 1 μ Gal and 1 mm after a second iteration.The second iteration accounts for the changes in the geoid due to the superposed synthetic topographic mass distribution. The first iteration of AusSEGM is compared with Australian gravity and GPS-levelling data to verify that it gives a realistic representation of the Earth’s gravity field. As a by-product of this comparison, AusSEGM gives further evidence of the north–south-trending error in the Australian Height Datum. The freely available AusSEGM-derived gravity and SDEM data, included as Electronic Supplementary Material (ESM) with this paper, can be used to compute a geoid model that, if correct, will agree to in 3 mm with the AusSEGM geoidal heights, thus offering independent verification of theories and numerical techniques used for regional geoid modelling.

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