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    Comparison of geosat and gravimetric geoid profiles in the North Sea

    Access Status
    Fulltext not available
    Authors
    Stewart, Michael
    Featherstone, Will
    Kirby, Jonathan
    Date
    1998
    Type
    Journal Article
    
    Metadata
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    Citation
    Stewart, Michael and Featherstone, Will and Kirby, Jonathan. 1998. Comparison of geosat and gravimetric geoid profiles in the North Sea. Marine Geodesy. 21(4): pp. 319-330.
    Source Title
    Marine Geodesy
    DOI
    10.1080/01490419809388145
    ISSN
    01490419
    Faculty
    Department of Spatial Sciences
    Faculty of Science and Engineering
    The Western Australian School of Mines
    URI
    http://hdl.handle.net/20.500.11937/35606
    Collection
    • Curtin Research Publications
    Abstract

    Sea surface height profiles derived from 2-year, repeat track, Geosat altimeter data have been compared with a regional gravimetric geoid in the western North Sea, computed using a geopotential model and terrestrial gravity data. The comparison encompasses 18 Geosat profiles covering a 750x850 km area of the North Sea. After a second-order polynomial was used to model the long-wavelength differences which cannot be clearly separated over an area of this size, results show agreement to better than +/-3 cm for wavelengths between approximately 20 and 750 km. In regions where terrestrial gravity data were not available to improve the geoid, similar comparisons with the OSU91A geopotential model alone show differences of up to +/-6 cm. This illustrates the importance of incorporating local gravity data in regional geoid computations, and partly validates the regional gravimetric geoid solution and Geosat sea surface profiles in the western North Sea. It is concluded that, in marine areas where the sea surface topography is known to be small in magnitude, Geosat sea surface profiles can act as an independent control on gravimetric geoids in the medium-wavelength range.

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