Validation of the AUSGeoid98 model in Western Australia using historic astrogeodetically observed deviations of the vertical
AUSGeoid98 is the national standard quasigeoid model of Australia, which is accompanied by a grid of vertical deviations (angular differences between the Earth's gravity vector and the surface-normal to the reference ellipsoid). Conventionally, co-located Global Positioning System (GPS) and sp...
| Main Authors: | , |
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| Format: | Journal Article |
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Royal Society of Western Australia
2007
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| Online Access: | http://hdl.handle.net/20.500.11937/18984 |
| _version_ | 1848749903696625664 |
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| author | Featherstone, Will Morgan, L. |
| author_facet | Featherstone, Will Morgan, L. |
| author_sort | Featherstone, Will |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | AUSGeoid98 is the national standard quasigeoid model of Australia, which is accompanied by a grid of vertical deviations (angular differences between the Earth's gravity vector and the surface-normal to the reference ellipsoid). Conventionally, co-located Global Positioning System (GPS) and spirit-levelling data have been used to assess the precision of quasigeoid models. Here, we instead use a totally independent set of 435 vertical deviations, observed at astrogeodetic stations across Western Australia before 1966, to assess the AUSGeoid98 gravimetrically modelled vertical deviations. This point-wise comparison shows that (after three-sigma rejection of 15 outliers) AUSGeoid98 can deliver vertical deviations with a precision (standard deviation) of around one arc-second, which is generally adequate for the reduction of current terrestrial-geodetic survey data in this State. |
| first_indexed | 2025-11-14T07:28:20Z |
| format | Journal Article |
| id | curtin-20.500.11937-18984 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:28:20Z |
| publishDate | 2007 |
| publisher | Royal Society of Western Australia |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-189842017-01-30T12:11:10Z Validation of the AUSGeoid98 model in Western Australia using historic astrogeodetically observed deviations of the vertical Featherstone, Will Morgan, L. vertical deviations geodetic astronomy geodetic surveying quasigeoid geodesy AUSGeoid98 is the national standard quasigeoid model of Australia, which is accompanied by a grid of vertical deviations (angular differences between the Earth's gravity vector and the surface-normal to the reference ellipsoid). Conventionally, co-located Global Positioning System (GPS) and spirit-levelling data have been used to assess the precision of quasigeoid models. Here, we instead use a totally independent set of 435 vertical deviations, observed at astrogeodetic stations across Western Australia before 1966, to assess the AUSGeoid98 gravimetrically modelled vertical deviations. This point-wise comparison shows that (after three-sigma rejection of 15 outliers) AUSGeoid98 can deliver vertical deviations with a precision (standard deviation) of around one arc-second, which is generally adequate for the reduction of current terrestrial-geodetic survey data in this State. 2007 Journal Article http://hdl.handle.net/20.500.11937/18984 Royal Society of Western Australia fulltext |
| spellingShingle | vertical deviations geodetic astronomy geodetic surveying quasigeoid geodesy Featherstone, Will Morgan, L. Validation of the AUSGeoid98 model in Western Australia using historic astrogeodetically observed deviations of the vertical |
| title | Validation of the AUSGeoid98 model in Western Australia using historic astrogeodetically observed deviations of the vertical |
| title_full | Validation of the AUSGeoid98 model in Western Australia using historic astrogeodetically observed deviations of the vertical |
| title_fullStr | Validation of the AUSGeoid98 model in Western Australia using historic astrogeodetically observed deviations of the vertical |
| title_full_unstemmed | Validation of the AUSGeoid98 model in Western Australia using historic astrogeodetically observed deviations of the vertical |
| title_short | Validation of the AUSGeoid98 model in Western Australia using historic astrogeodetically observed deviations of the vertical |
| title_sort | validation of the ausgeoid98 model in western australia using historic astrogeodetically observed deviations of the vertical |
| topic | vertical deviations geodetic astronomy geodetic surveying quasigeoid geodesy |
| url | http://hdl.handle.net/20.500.11937/18984 |