Evidence of a North-South Trend Between AUSGeoid98 and the Australian Height Datum in Southwest Australia
The AUSGeoid98 gravimetric geoid model has been compared with 48 GPS-levelling points at a ~50 km spacing across part of the southwest of Western Australia. This is arguably the best subset of GPS-derived ellipsoidal heights in Australia with an internally estimated precision of <±9mm. The spri...
| Main Author: | |
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| Format: | Journal Article |
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Institution of Engineering and Mining Surveyors Australia Inc.
2004
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| Online Access: | http://hdl.handle.net/20.500.11937/21018 |
| _version_ | 1848750472887795712 |
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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 gravimetric geoid model has been compared with 48 GPS-levelling points at a ~50 km spacing across part of the southwest of Western Australia. This is arguably the best subset of GPS-derived ellipsoidal heights in Australia with an internally estimated precision of <±9mm. The sprit-levelled heights were tied to the Australian Height Datum (AHD) using class C techniques [12mm-root-km allowable misclose]. The comparisons show that AUSGeoid98 gives a GPS height transformation to the AHD with a precision of ~±13 cm, which is less than reported earlier (~±36 cm) for a nationwide dataset. A clear north-south trend of ~0.81 mm/km [ppm] is also evident in the differences; of which approximately one-third is attributable to a north-south error in the AHD induced by dominant north-south sea surface topography effects at the nearby fixed tide gauges. After removal of this north-south trend, the standard deviation of the differences reduces to ~5 cm. |
| first_indexed | 2025-11-14T07:37:23Z |
| format | Journal Article |
| id | curtin-20.500.11937-21018 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:37:23Z |
| publishDate | 2004 |
| publisher | Institution of Engineering and Mining Surveyors Australia Inc. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-210182017-01-30T12:22:39Z Evidence of a North-South Trend Between AUSGeoid98 and the Australian Height Datum in Southwest Australia Featherstone, Will The AUSGeoid98 gravimetric geoid model has been compared with 48 GPS-levelling points at a ~50 km spacing across part of the southwest of Western Australia. This is arguably the best subset of GPS-derived ellipsoidal heights in Australia with an internally estimated precision of <±9mm. The sprit-levelled heights were tied to the Australian Height Datum (AHD) using class C techniques [12mm-root-km allowable misclose]. The comparisons show that AUSGeoid98 gives a GPS height transformation to the AHD with a precision of ~±13 cm, which is less than reported earlier (~±36 cm) for a nationwide dataset. A clear north-south trend of ~0.81 mm/km [ppm] is also evident in the differences; of which approximately one-third is attributable to a north-south error in the AHD induced by dominant north-south sea surface topography effects at the nearby fixed tide gauges. After removal of this north-south trend, the standard deviation of the differences reduces to ~5 cm. 2004 Journal Article http://hdl.handle.net/20.500.11937/21018 Institution of Engineering and Mining Surveyors Australia Inc. fulltext |
| spellingShingle | Featherstone, Will Evidence of a North-South Trend Between AUSGeoid98 and the Australian Height Datum in Southwest Australia |
| title | Evidence of a North-South Trend Between AUSGeoid98 and the Australian Height Datum in Southwest Australia |
| title_full | Evidence of a North-South Trend Between AUSGeoid98 and the Australian Height Datum in Southwest Australia |
| title_fullStr | Evidence of a North-South Trend Between AUSGeoid98 and the Australian Height Datum in Southwest Australia |
| title_full_unstemmed | Evidence of a North-South Trend Between AUSGeoid98 and the Australian Height Datum in Southwest Australia |
| title_short | Evidence of a North-South Trend Between AUSGeoid98 and the Australian Height Datum in Southwest Australia |
| title_sort | evidence of a north-south trend between ausgeoid98 and the australian height datum in southwest australia |
| url | http://hdl.handle.net/20.500.11937/21018 |