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    Two-step procedures for hybrid geoid modelling

    Access Status
    Fulltext not available
    Authors
    Sjoeberg, L.
    Featherstone, Will
    Date
    2004
    Type
    Journal Article
    
    Metadata
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    Citation
    Sjoeberg, Lars and Featherstone, Will. 2004. Two-step procedures for hybrid geoid modelling. Journal of Geodesy 78 (1): 66-75.
    Source Title
    Journal of Geodesy
    DOI
    10.1007/s00190-003-0367-9
    Faculty
    Division of Resources and Environment
    Department of Spatial Sciences
    School
    Western Australian Centre for Geodesy
    Remarks

    The original publication is available at https://link.springer.com/

    URI
    http://hdl.handle.net/20.500.11937/6434
    Collection
    • Curtin Research Publications
    Abstract

    A variety of mathematical models exist with which to combine long-wavelength geoid information from an Earth gravity model (EGM) with terrestrial gravity data. As new data become available, such as an extended or refined EGM and/or some variance covariance information from terrestrial gravity data, this new information can be combined with a previous geoid model through a so-called hybrid estimator. The hybrid estimator is defined as a two-step estimator, which provides a solution that is a compromise between computational labour and matching of the entire data set. Some commonly used geoid modifications are compared, and several hybrid estimators are introduced. It is concluded that, in general, hybrid estimators linking the new information to old data by the least squares principle should be preferred to deterministic combinations.

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