Unification of New Zealand's local vertical datums: iterative gravimetric quasigeoid computations
New Zealand uses 13 separate local vertical datums (LVDs) based on normal-orthometric-corrected precise geodetic levelling from 12 different tide-gauges. We describe their unification using a regional gravimetric quasigeoid model and GPS-levelling data on each LVD. A novel application of iterative...
| Main Authors: | , |
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| Format: | Journal Article |
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Springer - Verlag
2009
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| Online Access: | http://hdl.handle.net/20.500.11937/33690 |
| _version_ | 1848754017042169856 |
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| author | Featherstone, Will Amos, Matthew |
| author_facet | Featherstone, Will Amos, Matthew |
| author_sort | Featherstone, Will |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | New Zealand uses 13 separate local vertical datums (LVDs) based on normal-orthometric-corrected precise geodetic levelling from 12 different tide-gauges. We describe their unification using a regional gravimetric quasigeoid model and GPS-levelling data on each LVD. A novel application of iterative quasigeoid computation is used, where the LVD offsets computed from earlier models are used to apply additional gravity reductions from each LVD to that model. The solution converges after only three iterations yielding LVD offsets ranging from 0.24 m to 0.58 m with an average standard deviation of 0.08 m. The so-computed LVD offsets agree, within expected data errors, with geodetically levelled height differences at common benchmarks between adjacent LVDs. This shows that iterated quasigeoid models do have a role in vertical datum unification. |
| first_indexed | 2025-11-14T08:33:43Z |
| format | Journal Article |
| id | curtin-20.500.11937-33690 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:33:43Z |
| publishDate | 2009 |
| publisher | Springer - Verlag |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-336902017-09-13T16:07:59Z Unification of New Zealand's local vertical datums: iterative gravimetric quasigeoid computations Featherstone, Will Amos, Matthew Vertical datum unification iterative quasigeoid computation geodetic levelling New Zealand uses 13 separate local vertical datums (LVDs) based on normal-orthometric-corrected precise geodetic levelling from 12 different tide-gauges. We describe their unification using a regional gravimetric quasigeoid model and GPS-levelling data on each LVD. A novel application of iterative quasigeoid computation is used, where the LVD offsets computed from earlier models are used to apply additional gravity reductions from each LVD to that model. The solution converges after only three iterations yielding LVD offsets ranging from 0.24 m to 0.58 m with an average standard deviation of 0.08 m. The so-computed LVD offsets agree, within expected data errors, with geodetically levelled height differences at common benchmarks between adjacent LVDs. This shows that iterated quasigeoid models do have a role in vertical datum unification. 2009 Journal Article http://hdl.handle.net/20.500.11937/33690 10.1007/s00190-008-0232-y Springer - Verlag fulltext |
| spellingShingle | Vertical datum unification iterative quasigeoid computation geodetic levelling Featherstone, Will Amos, Matthew Unification of New Zealand's local vertical datums: iterative gravimetric quasigeoid computations |
| title | Unification of New Zealand's local vertical datums: iterative gravimetric quasigeoid computations |
| title_full | Unification of New Zealand's local vertical datums: iterative gravimetric quasigeoid computations |
| title_fullStr | Unification of New Zealand's local vertical datums: iterative gravimetric quasigeoid computations |
| title_full_unstemmed | Unification of New Zealand's local vertical datums: iterative gravimetric quasigeoid computations |
| title_short | Unification of New Zealand's local vertical datums: iterative gravimetric quasigeoid computations |
| title_sort | unification of new zealand's local vertical datums: iterative gravimetric quasigeoid computations |
| topic | Vertical datum unification iterative quasigeoid computation geodetic levelling |
| url | http://hdl.handle.net/20.500.11937/33690 |