AUSGeoid2020 combined gravimetric–geometric model: location-specific uncertainties and baseline-length-dependent error decorrelation
AUSGeoid2020 is a combined gravimetric–geometric model (sometimes called a “hybrid quasigeoid model”) that provides the separation between the Geocentric Datum of Australia 2020 (GDA2020) ellipsoid and Australia’s national vertical datum, the Australian Height Datum (AHD). This model is also provide...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Published: |
Springer - Verlag
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/71948 |
| _version_ | 1848762618066501632 |
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| author | Brown, N. McCubbine, J. Featherstone, Will Gowans, N. Woods, A. Baran, I. |
| author_facet | Brown, N. McCubbine, J. Featherstone, Will Gowans, N. Woods, A. Baran, I. |
| author_sort | Brown, N. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | AUSGeoid2020 is a combined gravimetric–geometric model (sometimes called a “hybrid quasigeoid model”) that provides the separation between the Geocentric Datum of Australia 2020 (GDA2020) ellipsoid and Australia’s national vertical datum, the Australian Height Datum (AHD). This model is also provided with a location-specific uncertainty propagated from a combination of the levelling, GPS ellipsoidal height and gravimetric quasigeoid data errors via least squares prediction. We present a method for computing the relative uncertainty (i.e. uncertainty of the height between any two points) between AUSGeoid2020-derived AHD heights based on the principle of correlated errors cancelling when used over baselines. Results demonstrate AUSGeoid2020 is more accurate than traditional third-order levelling in Australia at distances beyond 3 km, which is 12 mm of allowable misclosure per square root km of levelling. As part of the above work, we identified an error in the gravimetric quasigeoid in Port Phillip Bay (near Melbourne in SE Australia) coming from altimeter-derived gravity anomalies. This error was patched using alternative altimetry data. |
| first_indexed | 2025-11-14T10:50:25Z |
| format | Journal Article |
| id | curtin-20.500.11937-71948 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:50:25Z |
| publishDate | 2018 |
| publisher | Springer - Verlag |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-719482019-01-15T01:24:46Z AUSGeoid2020 combined gravimetric–geometric model: location-specific uncertainties and baseline-length-dependent error decorrelation Brown, N. McCubbine, J. Featherstone, Will Gowans, N. Woods, A. Baran, I. AUSGeoid2020 is a combined gravimetric–geometric model (sometimes called a “hybrid quasigeoid model”) that provides the separation between the Geocentric Datum of Australia 2020 (GDA2020) ellipsoid and Australia’s national vertical datum, the Australian Height Datum (AHD). This model is also provided with a location-specific uncertainty propagated from a combination of the levelling, GPS ellipsoidal height and gravimetric quasigeoid data errors via least squares prediction. We present a method for computing the relative uncertainty (i.e. uncertainty of the height between any two points) between AUSGeoid2020-derived AHD heights based on the principle of correlated errors cancelling when used over baselines. Results demonstrate AUSGeoid2020 is more accurate than traditional third-order levelling in Australia at distances beyond 3 km, which is 12 mm of allowable misclosure per square root km of levelling. As part of the above work, we identified an error in the gravimetric quasigeoid in Port Phillip Bay (near Melbourne in SE Australia) coming from altimeter-derived gravity anomalies. This error was patched using alternative altimetry data. 2018 Journal Article http://hdl.handle.net/20.500.11937/71948 10.1007/s00190-018-1202-7 http://creativecommons.org/licenses/by/4.0/ Springer - Verlag fulltext |
| spellingShingle | Brown, N. McCubbine, J. Featherstone, Will Gowans, N. Woods, A. Baran, I. AUSGeoid2020 combined gravimetric–geometric model: location-specific uncertainties and baseline-length-dependent error decorrelation |
| title | AUSGeoid2020 combined gravimetric–geometric model: location-specific uncertainties and baseline-length-dependent error decorrelation |
| title_full | AUSGeoid2020 combined gravimetric–geometric model: location-specific uncertainties and baseline-length-dependent error decorrelation |
| title_fullStr | AUSGeoid2020 combined gravimetric–geometric model: location-specific uncertainties and baseline-length-dependent error decorrelation |
| title_full_unstemmed | AUSGeoid2020 combined gravimetric–geometric model: location-specific uncertainties and baseline-length-dependent error decorrelation |
| title_short | AUSGeoid2020 combined gravimetric–geometric model: location-specific uncertainties and baseline-length-dependent error decorrelation |
| title_sort | ausgeoid2020 combined gravimetric–geometric model: location-specific uncertainties and baseline-length-dependent error decorrelation |
| url | http://hdl.handle.net/20.500.11937/71948 |