A New GPS-based evaluation of distortions in the Australian Height Datum in Western Australia
Previous work on assessing the errors in the Australian Height Datum (AHD) across Western Australia used fewer and older global positioning system (GPS) data and a global quasigeoid model. A larger and improved State-wide set of 243 GPS-derived ellipsoidal heights and a regional gravimetric quasigeo...
| Main Authors: | , |
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| Format: | Journal Article |
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Royal Society of Western Australia
2008
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| Online Access: | http://hdl.handle.net/20.500.11937/33123 |
| _version_ | 1848753858076999680 |
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| author | Featherstone, Will Filmer, Michael |
| author_facet | Featherstone, Will Filmer, Michael |
| author_sort | Featherstone, Will |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Previous work on assessing the errors in the Australian Height Datum (AHD) across Western Australia used fewer and older global positioning system (GPS) data and a global quasigeoid model. A larger and improved State-wide set of 243 GPS-derived ellipsoidal heights and a regional gravimetric quasigeoid model are now available. Therefore, it is possible to re-evaluate the north-south tilt in the AHD and look for regional systematic distortions with some more confidence in Western Australia. This new analysis shows an apparent north-south tilt of ~0.27 mm/km in the existing AHD over the whole of the State, but which increases to ~0.6 mm/km over smaller regions, showing regional systematic distortions. When mean sea-level constraints are removed from the AHD by a minimally constrained least-squares adjustment of the spirit-levelling observations that is less prone to the effect of sea-surface topography, the north-south tilt reduces to ~0.18 mm/km, but the regional distortions remain, showing that errors are present in the spirit-levelling observations. |
| first_indexed | 2025-11-14T08:31:11Z |
| format | Journal Article |
| id | curtin-20.500.11937-33123 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:31:11Z |
| publishDate | 2008 |
| publisher | Royal Society of Western Australia |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-331232017-01-30T13:35:07Z A New GPS-based evaluation of distortions in the Australian Height Datum in Western Australia Featherstone, Will Filmer, Michael levelling AHD Heights quasigeoid sea surface topography GPS geodesy Previous work on assessing the errors in the Australian Height Datum (AHD) across Western Australia used fewer and older global positioning system (GPS) data and a global quasigeoid model. A larger and improved State-wide set of 243 GPS-derived ellipsoidal heights and a regional gravimetric quasigeoid model are now available. Therefore, it is possible to re-evaluate the north-south tilt in the AHD and look for regional systematic distortions with some more confidence in Western Australia. This new analysis shows an apparent north-south tilt of ~0.27 mm/km in the existing AHD over the whole of the State, but which increases to ~0.6 mm/km over smaller regions, showing regional systematic distortions. When mean sea-level constraints are removed from the AHD by a minimally constrained least-squares adjustment of the spirit-levelling observations that is less prone to the effect of sea-surface topography, the north-south tilt reduces to ~0.18 mm/km, but the regional distortions remain, showing that errors are present in the spirit-levelling observations. 2008 Journal Article http://hdl.handle.net/20.500.11937/33123 Royal Society of Western Australia fulltext |
| spellingShingle | levelling AHD Heights quasigeoid sea surface topography GPS geodesy Featherstone, Will Filmer, Michael A New GPS-based evaluation of distortions in the Australian Height Datum in Western Australia |
| title | A New GPS-based evaluation of distortions in the Australian Height Datum in Western Australia |
| title_full | A New GPS-based evaluation of distortions in the Australian Height Datum in Western Australia |
| title_fullStr | A New GPS-based evaluation of distortions in the Australian Height Datum in Western Australia |
| title_full_unstemmed | A New GPS-based evaluation of distortions in the Australian Height Datum in Western Australia |
| title_short | A New GPS-based evaluation of distortions in the Australian Height Datum in Western Australia |
| title_sort | new gps-based evaluation of distortions in the australian height datum in western australia |
| topic | levelling AHD Heights quasigeoid sea surface topography GPS geodesy |
| url | http://hdl.handle.net/20.500.11937/33123 |