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    Using models of the ocean's mean dynamic topography to identify errors in coastal geodetic levelling

    196755_196755.pdf (849.5Kb)
    Access Status
    Open access
    Authors
    Filmer, Michael
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Filmer, Michael. 2014. Using models of the ocean's mean dynamic topography to identify errors in coastal geodetic levelling. Marine Geodesy. 37 (1): pp. 47-64.
    Source Title
    Marine Geodesy
    DOI
    10.1080/01490419.2013.868383
    ISSN
    01490419
    Remarks

    This is an Author's Accepted Manuscript of an article published in Marine Geodesy (2014), copyright Taylor & Francis, available online at: <a href="http://www.tandfonline.com/10.1080/01490419.2013.868383">http://www.tandfonline.com/10.1080/01490419.2013.868383</a>.

    URI
    http://hdl.handle.net/20.500.11937/6117
    Collection
    • Curtin Research Publications
    Abstract

    Identifying errors (blunders and systematic errors) in coastal geodetic levelling networks has often been problematic. This is because (1) mean sea level (MSL) at tide gauges cannot be directly compared to height differences from levelling because the geoid/quasigeoid and MSL are not parallel, being separated by the ocean’s mean dynamic topography (MDT) and (2) the lack of redundancy at the edge of the levelling network. This paper sets out a methodology to independently identify blunders and/or systematic errors (over long distances) in geodetic levelling using MDT models to account for the separation between the geoid/quasigeoid and MSL at tide gauges. This method is then tested in a case study using an oceanographic MDT model, MSL observations, GNSS data and a quasigeoid model. The results are significant because the errors found could not be detected by standard levelling misclosure checks alone, with supplementary data from an MDT model, with cross-validation from GNSS-quasigeoid allowing their detection. In addition, it appears that an oceanographic-only MDT is as effective as GNSS and a quasigeoid model for detecting levelling errors, which could be particularly useful for countries with coastal levelling errors in their levelling networks that cannot be identified by conventional levelling closure checks.

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