The AUSGeoid98 geoid model of Australia: data treatment, computations and comparisons with GPS-levelling data

W.E. Featherstone; J.F. Kirby; A.H.W. Kearsley; J.R. Gilliland; G.M. Johnston; J. Steed; René Forsberg; M.G. Sideris

The AUSGeoid98 geoid model of Australia: data treatment, computations and comparisons with GPS-levelling data

W.E. Featherstone, J.F. Kirby, A.H.W. Kearsley, J.R. Gilliland, G.M. Johnston, J. Steed, René Forsberg, M.G. Sideris

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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 arcminute grid with respect to the GRS80 ellipsoid, and residual geoid heights were computed using the I-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.

Original language	English
Journal	Journal of Geodesy
Volume	75
Issue number	5-6
Pages (from-to)	313-330
ISSN	0949-7714
Publication status	Published - 2001

Keywords

modified kernels
practical geoid computation
gravity data processing
Australia

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title = "The AUSGeoid98 geoid model of Australia: data treatment, computations and comparisons with GPS-levelling data",

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 arcminute grid with respect to the GRS80 ellipsoid, and residual geoid heights were computed using the I-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.",

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T1 - The AUSGeoid98 geoid model of Australia: data treatment, computations and comparisons with GPS-levelling data

AU - Featherstone, W.E.

AU - Kirby, J.F.

AU - Kearsley, A.H.W.

AU - Gilliland, J.R.

AU - Johnston, G.M.

AU - Steed, J.

AU - Forsberg, René

AU - Sideris, M.G.

PY - 2001

Y1 - 2001

N2 - 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 arcminute grid with respect to the GRS80 ellipsoid, and residual geoid heights were computed using the I-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.

AB - 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 arcminute grid with respect to the GRS80 ellipsoid, and residual geoid heights were computed using the I-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.

KW - modified kernels

KW - practical geoid computation

KW - gravity data processing

KW - Australia

M3 - Journal article

VL - 75

SP - 313

EP - 330

JO - Journal of Geodesy

JF - Journal of Geodesy

SN - 0949-7714

IS - 5-6

ER -

The AUSGeoid98 geoid model of Australia: data treatment, computations and comparisons with GPS-levelling data

Abstract

Keywords

UN SDGs

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