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dc.contributor.authorFeatherstone, Will
dc.contributor.authorClaessens, Sten
dc.contributor.authorKuhn, Michael
dc.contributor.authorKirby, Jonathan
dc.contributor.authorSproule, David
dc.contributor.authorDarbeheshti, Neda
dc.contributor.authorAwange, Joseph
dc.contributor.editorDr Volker Janssen
dc.contributor.editorDr Mick Russell
dc.date.accessioned2017-01-30T12:45:43Z
dc.date.available2017-01-30T12:45:43Z
dc.date.created2010-03-29T20:04:55Z
dc.date.issued2007
dc.identifier.citationFeatherstone, Will and Claessens, Sten and Kuhn, Michael and Kirby, Jonathan and Sproule, David and Darbeheshti, Neda and Awange, Joseph. 2007. Progress Towards the New Australian Geoid-type Model as a Replacement for AUSGeoid98, in Dr Volker Janssen, Dr Mick Russell (ed), Spatial Sciences Institute Biennial International Conference SSC2007, May 14 2008, pp. 243-261. Hobart, Tasmania: Spatial Sciences Institute.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/24918
dc.description.abstract

We are nearing the final stages of producing a new geoid-type model for Australia that will replace AUSGeoid98. The terminology geoid-type reflects that the gravimetric quasigeoid model will be fitted to Australia-wide GPS-levelling data, probably using least-squares collocation. This will provide a user-friendly product for the more direct transformation of GPS-derived ellipsoidal heights to normal-orthometric heights on the Australian Height Datum (AHD). This has become necessary because Australian government geodetic authorities have decided to retain the AHD for the 'foreseeable future', whereas it is well known that the AHD contains about 1-2m distortions mainly due to fixing the AHD height to zero at 32 tide gauges. Another driver is that there is an increasing trend towards establishing vertical control using carrier-phase GPS via the single-point precise point positioning (PPP) technique or over very long baselines using the AUSPOS on-line service. When the quasigeoid model was used with differential GPS over short baselines, common/correlated errors cancelled in this relative mode, whereas they do not in the absolute or long-baseline modes. As such, AUSPOS and PPP users of AUSGeoid98 can sometimes find up to 2m discrepancies with existing AHD benchmarks. In addition, we will use improved quasigeoid modelling techniques and the most recent datasets available, such as GRACE (Gravity Recovery and Climate Experiment) global gravity field models, satellite-altimeter-derived gravity anomalies in marine areas that have been re-tracked to improve them in the coastal zone, the latest cleaned release of the Australian land gravity database, the version 2 Australian digital elevation model, which now allows the computation of nine arc-second resolution topographical effects. Some emphasis will be placed on the use of modified kernels as high-pass filters to manage long-wavelength errors in the Australian terrestrial gravity and terrain data, so that they do not contaminate the high-quality GRACE data.

dc.publisherSpatial Sciences Institute
dc.titleProgress Towards the New Australian Geoid-type Model as a Replacement for AUSGeoid98
dc.typeConference Paper
dcterms.source.startPage243
dcterms.source.endPage261
dcterms.source.titleConference Proceedings of Spatial Sciences Institute Biennial International Conference SSC2007
dcterms.source.seriesConference Proceedings of Spatial Sciences Institute Biennial International Conference SSC2007
dcterms.source.conferenceSpatial Sciences Institute Biennial International Conference SSC2007
dcterms.source.conference-start-dateMay 14 2008
dcterms.source.conferencelocationHobart, Tasmania
dcterms.source.placeCanberra, ACT
curtin.accessStatusOpen access
curtin.facultyDepartment of Spatial Sciences
curtin.facultyFaculty of Science and Engineering
curtin.facultyWA School of Mines


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