Towards the unification of the Australian Height Datum between mainland and Tasmania using GPS and AUSGeoid98
The AUSGeoid98 geoid model is used in conjunction with nation-wide GPS networks and spirit-levelled Australian Height Datum (AHD) heights at 1013 points, and subsets thereof, to estimate the vertical offset between the AHD as realised on the Australian mainland [AHD(Mainland)] and in Tasmania [AHD(T...
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| Format: | Journal Article |
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Institution of Surveyors, Australia
2000
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| Online Access: | http://hdl.handle.net/20.500.11937/32752 |
| _version_ | 1848753750511976448 |
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| author | Featherstone, Will |
| author_facet | Featherstone, Will |
| author_sort | Featherstone, Will |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The AUSGeoid98 geoid model is used in conjunction with nation-wide GPS networks and spirit-levelled Australian Height Datum (AHD) heights at 1013 points, and subsets thereof, to estimate the vertical offset between the AHD as realised on the Australian mainland [AHD(Mainland)] and in Tasmania [AHD(Tas)]. It appears that the AHD(Tas) is offset below the AHD(Mainland) somewhere between (26±33)cm and (12±12)cm, which is in broad agreement with previous estimates made by Rapp (1994) and Rizos et al. (1991), as well as with long-wavelength sea-surface topography models. However, the estimates of the vertical datum difference are heavily influenced by the spatial distribution of the GPS-AHD control points used, with different offsets being computed according to latitude and proximity to the coast. This is most probably due to the effect of fixing of multiple tide gauges to mean sea level in the adjustment of the AHD. This has implications for any future unification of the AHD(Mainland) and AHD(Tas) into a single, global vertical datum, where the appropriate datum connection points must first be chosen. |
| first_indexed | 2025-11-14T08:29:29Z |
| format | Journal Article |
| id | curtin-20.500.11937-32752 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:29:29Z |
| publishDate | 2000 |
| publisher | Institution of Surveyors, Australia |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-327522017-01-30T13:32:54Z Towards the unification of the Australian Height Datum between mainland and Tasmania using GPS and AUSGeoid98 Featherstone, Will Vertical datum unification Australian Height Datum geoid The AUSGeoid98 geoid model is used in conjunction with nation-wide GPS networks and spirit-levelled Australian Height Datum (AHD) heights at 1013 points, and subsets thereof, to estimate the vertical offset between the AHD as realised on the Australian mainland [AHD(Mainland)] and in Tasmania [AHD(Tas)]. It appears that the AHD(Tas) is offset below the AHD(Mainland) somewhere between (26±33)cm and (12±12)cm, which is in broad agreement with previous estimates made by Rapp (1994) and Rizos et al. (1991), as well as with long-wavelength sea-surface topography models. However, the estimates of the vertical datum difference are heavily influenced by the spatial distribution of the GPS-AHD control points used, with different offsets being computed according to latitude and proximity to the coast. This is most probably due to the effect of fixing of multiple tide gauges to mean sea level in the adjustment of the AHD. This has implications for any future unification of the AHD(Mainland) and AHD(Tas) into a single, global vertical datum, where the appropriate datum connection points must first be chosen. 2000 Journal Article http://hdl.handle.net/20.500.11937/32752 Institution of Surveyors, Australia fulltext |
| spellingShingle | Vertical datum unification Australian Height Datum geoid Featherstone, Will Towards the unification of the Australian Height Datum between mainland and Tasmania using GPS and AUSGeoid98 |
| title | Towards the unification of the Australian Height Datum between mainland and Tasmania using GPS and AUSGeoid98 |
| title_full | Towards the unification of the Australian Height Datum between mainland and Tasmania using GPS and AUSGeoid98 |
| title_fullStr | Towards the unification of the Australian Height Datum between mainland and Tasmania using GPS and AUSGeoid98 |
| title_full_unstemmed | Towards the unification of the Australian Height Datum between mainland and Tasmania using GPS and AUSGeoid98 |
| title_short | Towards the unification of the Australian Height Datum between mainland and Tasmania using GPS and AUSGeoid98 |
| title_sort | towards the unification of the australian height datum between mainland and tasmania using gps and ausgeoid98 |
| topic | Vertical datum unification Australian Height Datum geoid |
| url | http://hdl.handle.net/20.500.11937/32752 |