Using Airborne Gravimetry Data To Improve The Australian Model Of Zero Heights

Using Airborne Gravimetry Data To Improve The Australian Model Of Zero Heights

Presenter name & affiliations / institution: Dr Jack McCubbine, Geoscience Australia.

Abstract: In 2017, a new Australian quasigeoid model (AGQG2017) was released, with an accompanying map of uncertainty values. The model was determined from the national terrestrial gravity database and satellite altimetry derived gravity anomalies. The coverage and reliability of these data limit the accuracy of the quasigeoid model to 5 - 8 cm. However, users of the model require a reference surface which is accurate to 4 cm, or better. Geoscience Australia has partnered with, The South Australian Department of Planning, Transport and Infrastructure, The Surveyor-General Victoria within the Department of Land Water and Planning and The Geological Survey of Victoria within the Department of Jobs, Precincts and Regions to capture airborne gravity data over Greater Adelaide, Greater Melbourne and Eastern Victoria Highlands, to improve the quasigeoid model and to advance geophysical modelling.

Bio: In 2016, Jack was awarded a PhD in Geophysics from Victoria University of Wellington for his work on the collection of a national wide airborne gravity dataset, producing a new series of national gravity grids, and a new quasigeoid model for New Zealand. Following this, he came to work at Curtin University, as a post doc, working on the development of a new Australian quasigeoid model with uncertainty estimates. Jack later moved to work at GA in the National Geodesy section, to assist with the geodetic absolute gravity program and to continue to refine the national quasigeoid model.

More information can be found here: https://www.land.vic.gov.au/surveying/geodesy/airborne-gravity-survey

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