The AUSGeoid98 geoid model of Australia: data treatment, computations and comparisons with GPS-levelling data |
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| Authors: | W E Featherstone J F Kirby A H W Kearsley J R Gilliland G M Johnston J Steed R Forsberg M G Sideris |
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| Institution: | (1) Department of Spatial Sciences, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia e-mail: W.featherstone@curtin.edu.au; Tel.: +61-8-9266-2734; Fax: +61-8-9266-2703, AU;(2) School of Geomatic Engineering, The University of New South Wales, Sydney, NSW 2052, Australia, AU;(3) School of Geoinformatics, Planning & Building, University of South Australia, North Terrace, Adelaide, SA 5000, Australia, AU;(4) Geodesy Section, Australian Surveying and Land Information Group, PO Box 2, Belconnen, ACT 2616, Australia, AU;(5) Geodynamics Department, Kort og Matrikelstyrelsen, Rentermestervej 8, 400 Copenhagen, Denmark, DK;(6) Department of Geomatics Engineering, The University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada, CA |
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| Abstract: | The AUSGeoid98 gravimetric geoid model of Australia has been computed using data from the EGM96 global geopotential model,
the 1996 release of the Australian gravity database, a nationwide digital elevation model, and satellite altimeter-derived
marine gravity anomalies. The geoid heights are on a 2 by 2 arc-minute grid with respect to the GRS80 ellipsoid, and residual
geoid heights were computed using the 1-D fast Fourier transform technique. This has been adapted to include a deterministically
modified kernel over a spherical cap of limited spatial extent in the generalised Stokes scheme. Comparisons of AUSGeoid98
with GPS and Australian Height Datum (AHD) heights across the continent give an RMS agreement of ±0.364 m, although this apparently
large value is attributed partly to distortions in the AHD.
Received: 10 March 2000 / Accepted: 21 February 2001 |
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| Keywords: | : Practical Geoid Computation – Gravity Data Processing – Modified Kernels – Australia |
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