Estimates of the separation between the geoid and the quasigeoid over Australia
The geoid is the equipotential surface to which orthometric heights are referred, whereas the quasigeoid is the non-equipotential surface to which normal heights are referred. The Australian Height Datum is a hybrid of these vertical datum surfaces, being called a normal orthometric height system. I...
| Main Authors: | , |
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| Format: | Journal Article |
| Published: |
Institution of Surveyors, Australia
1998
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| Online Access: | http://www.cage.curtin.edu.au/~will/gra68_05.pdf http://hdl.handle.net/20.500.11937/4002 |
| _version_ | 1848744391349370880 |
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| author | Featherstone, Will Kirby, Jonathan |
| author_facet | Featherstone, Will Kirby, Jonathan |
| author_sort | Featherstone, Will |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The geoid is the equipotential surface to which orthometric heights are referred, whereas the quasigeoid is the non-equipotential surface to which normal heights are referred. The Australian Height Datum is a hybrid of these vertical datum surfaces, being called a normal orthometric height system. It is therefore appropriate to determine the separation between these reference surfaces with a view to future gravimetric determinations of the geoid or quasigeoid of Australia. Using Bouguer gravity anomalies and a digital elevation model, the maximum separation between these surfaces has been estimated to be ~150 mm, with a standard deviation of 218 mm, in Australia. When compared to 129 Global Positioning System and Australian Height Datum control points across the continent, the inclusion of the quasigeoid-to-geoid separation term makes no difference to the standard deviations of the differences. This indicates that the determination of either the geoid or the quasigeoid is appropriate for the determination of Australian Height Datum heights from the Global Positioning System in Australia. |
| first_indexed | 2025-11-14T06:00:43Z |
| format | Journal Article |
| id | curtin-20.500.11937-4002 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:00:43Z |
| publishDate | 1998 |
| publisher | Institution of Surveyors, Australia |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-40022017-01-30T10:35:46Z Estimates of the separation between the geoid and the quasigeoid over Australia Featherstone, Will Kirby, Jonathan The geoid is the equipotential surface to which orthometric heights are referred, whereas the quasigeoid is the non-equipotential surface to which normal heights are referred. The Australian Height Datum is a hybrid of these vertical datum surfaces, being called a normal orthometric height system. It is therefore appropriate to determine the separation between these reference surfaces with a view to future gravimetric determinations of the geoid or quasigeoid of Australia. Using Bouguer gravity anomalies and a digital elevation model, the maximum separation between these surfaces has been estimated to be ~150 mm, with a standard deviation of 218 mm, in Australia. When compared to 129 Global Positioning System and Australian Height Datum control points across the continent, the inclusion of the quasigeoid-to-geoid separation term makes no difference to the standard deviations of the differences. This indicates that the determination of either the geoid or the quasigeoid is appropriate for the determination of Australian Height Datum heights from the Global Positioning System in Australia. 1998 Journal Article http://hdl.handle.net/20.500.11937/4002 http://www.cage.curtin.edu.au/~will/gra68_05.pdf Institution of Surveyors, Australia restricted |
| spellingShingle | Featherstone, Will Kirby, Jonathan Estimates of the separation between the geoid and the quasigeoid over Australia |
| title | Estimates of the separation between the geoid and the quasigeoid over Australia |
| title_full | Estimates of the separation between the geoid and the quasigeoid over Australia |
| title_fullStr | Estimates of the separation between the geoid and the quasigeoid over Australia |
| title_full_unstemmed | Estimates of the separation between the geoid and the quasigeoid over Australia |
| title_short | Estimates of the separation between the geoid and the quasigeoid over Australia |
| title_sort | estimates of the separation between the geoid and the quasigeoid over australia |
| url | http://www.cage.curtin.edu.au/~will/gra68_05.pdf http://hdl.handle.net/20.500.11937/4002 |