Assessment of EGM2008 over Britain using vertical deflections, and the problems with historical data
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, Austral...
| Main Authors: | , |
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| Format: | Journal Article |
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Maney Publishing
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/46481 |
| _version_ | 1848757569996193792 |
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| author | Featherstone, Will Olliver, J |
| author_facet | Featherstone, Will Olliver, J |
| author_sort | Featherstone, Will |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T09:30:11Z |
| format | Journal Article |
| id | curtin-20.500.11937-46481 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:30:11Z |
| publishDate | 2013 |
| publisher | Maney Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-464812017-09-13T13:39:37Z Assessment of EGM2008 over Britain using vertical deflections, and the problems with historical data Featherstone, Will Olliver, J vertical deflections EGM2008 British geodetic datums 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. 2013 Journal Article http://hdl.handle.net/20.500.11937/46481 10.1179/1752270613Y.0000000048 Maney Publishing fulltext |
| spellingShingle | vertical deflections EGM2008 British geodetic datums Featherstone, Will Olliver, J Assessment of EGM2008 over Britain using vertical deflections, and the problems with historical data |
| title | Assessment of EGM2008 over Britain using vertical deflections, and the problems with historical data |
| title_full | Assessment of EGM2008 over Britain using vertical deflections, and the problems with historical data |
| title_fullStr | Assessment of EGM2008 over Britain using vertical deflections, and the problems with historical data |
| title_full_unstemmed | Assessment of EGM2008 over Britain using vertical deflections, and the problems with historical data |
| title_short | Assessment of EGM2008 over Britain using vertical deflections, and the problems with historical data |
| title_sort | assessment of egm2008 over britain using vertical deflections, and the problems with historical data |
| topic | vertical deflections EGM2008 British geodetic datums |
| url | http://hdl.handle.net/20.500.11937/46481 |