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dc.contributor.authorBaran, Ireneusz
dc.contributor.authorKuhn, Michael
dc.contributor.authorClaessens, Sten
dc.contributor.authorFeatherstone, Will
dc.contributor.authorHolmes, S.
dc.contributor.authorVanicek, P.
dc.identifier.citationBaran, I. and Kuhn, M. and Claessens, S.J. and Featherstone, W.E. and Holmes, S.A. and Vanicek, P. 2006. A synthetic Earth gravity model designed specifically for testing regional gravimetric geoid determination algorithms. Journal of Geodesy. 80 (1): 1-16.

A synthetic [simulated] Earth gravity model (SEGM) of the geoid, gravity and topography has been constructed over Australia specifically for validating regional gravimetric geoid determination theories, techniques and computer software. This regional high-resolution (1-arc-min by 1-arc-min) Australian SEGM (AusSEGM) is a combined source and effect model. The long-wavelength effect part (up to and including spherical harmonic degree and order 360) is taken from an assumed errorless EGM96 global geopotential model. Using forward modelling via numerical Newtonian integration, the short-wavelength source part is computed from a high-resolution (3-arc-sec by 3-arc-sec) synthetic digital elevation model (SDEM), which is a fractal surface based on the GLOBE v1 DEM. All topographic masses are modelled with a constant mass-density of 2,670 kg/m3. Based on these input data, gravity values on the synthetic topography (on a grid and at arbitrarily distributed discrete points) and consistent geoidal heights at regular 1-arc-min geographical grid nodes have been computed. The precision of the synthetic gravity and geoid data (after a first iteration) is estimated to be better than 30 μ Gal and 3 mm, respectively, which reduces to 1 μ Gal and 1 mm after a second iteration.The second iteration accounts for the changes in the geoid due to the superposed synthetic topographic mass distribution. The first iteration of AusSEGM is compared with Australian gravity and GPS-levelling data to verify that it gives a realistic representation of the Earth’s gravity field. As a by-product of this comparison, AusSEGM gives further evidence of the north–south-trending error in the Australian Height Datum. The freely available AusSEGM-derived gravity and SDEM data, included as Electronic Supplementary Material (ESM) with this paper, can be used to compute a geoid model that, if correct, will agree to in 3 mm with the AusSEGM geoidal heights, thus offering independent verification of theories and numerical techniques used for regional geoid modelling.

dc.publisherSpringer - Verlag
dc.subjectNewtonian integration
dc.subjectregional geoid determination
dc.subjectforward modelling
dc.subjectSynthetic Earth gravity model (SEGM)
dc.titleA Synthetic Earth Gravity Model Designed Specifically for Testing Regional Gravimetric Geoid Determination Algorithms
dc.typeJournal Article
dcterms.source.titleJournal of Geodesy

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curtin.accessStatusOpen access
curtin.facultyDepartment of Spatial Sciences
curtin.facultyFaculty of Science and Engineering
curtin.facultyWA School of Mines

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