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- W2078136162 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 (1950–1976) 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." @default.
- W2078136162 created "2016-06-24" @default.
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- W2078136162 date "2013-09-01" @default.
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- W2078136162 title "Assessment of EGM2008 over Britain using vertical deflections, and problems with historical data" @default.
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- W2078136162 doi "https://doi.org/10.1179/1752270613y.0000000048" @default.
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