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    Assessment of EGM2008 over Britain using vertical deflections, and the problems with historical data

    195888_195888.pdf (927.5Kb)
    Access Status
    Open access
    Authors
    Featherstone, Will
    Olliver, J
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Featherstone, Will and Olliver, J. 2013. Assessment of EGM2008 over Britain using vertical deflections, and the problems with historical data. Survey Review. 45 (332): pp. 319-324.
    Source Title
    Survey Review
    DOI
    10.1179/1752270613Y.0000000048
    ISSN
    0039-6265
    Remarks

    Copyright © 2013 Maney Publishing

    URI
    http://hdl.handle.net/20.500.11937/46481
    Collection
    • Curtin Research Publications
    Abstract

    Vertical deflections synthesised from the Earth Gravitational Model 2008 (EGM2008) agree with astrogeodetic vertical deflections observed over mainland Britain to within ~1.2" RMS (north-south) and ~1.4" RMS (east-west), which is commensurate with values reported for North America, Australia and parts of continental Europe. For this assessment in Britain, there has been the additional need to transform the observed relative vertical deflections to absolute ones. Not applying horizontal datum transformations led to spurious results, so absolute vertical deflections must always be used to assess EGMs. Three datum transformations were trialled (three-parameter, seven-parameter and OSTN02), which show similar results when considering the estimated ~0.3" precision of these historical (1950 to 1976) astrogeodetic observations. Several other problems were encountered because of the historical nature of the data, comprising destruction of survey pillars, ambiguous station names, and a mixture of horizontal geodetic datums available in Britain.

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