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Methodology and Standards
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Updated:
03 March 2008
GravimetryAustralian National Gravity DatabaseThe Australian National Gravity Database contains information on gravity surveys conducted in Australia and its offshore Territories. Gravity survey reports, data and maps are sourced from within Geoscience Australia, State and Territory governments, mineral and petroleum exploration companies, universities and overseas organisations. The Australian National Gravity Database currently contains information on more than 1,400,000 point gravity observations taken in the course of over 1,500 surveys. The density and distribution of gravity stations in Australia is shown on the Gravity Station Coverage Map, 2007 (GIF 762KB) and the Gravity Station Location Map, 2007 (GIF 750KB). The gravity station locations shown on these maps are from surveys carried out since 1938 by Geoscience Australia, state and territory geological surveys, private companies and universities. The gravity station spacing varies from approximately 11 kilometres over much of northern and western Australia to 1.5 kilometres in Victoria. Federal, State and Territory governments have recently funded systematic infill to provide improved coverage over areas of scientific or economic interest. All open file gravity data in the Australian National Gravity Database is available to the public and may be obtained online free of charge. To download the complete database or data over a specific area of Australia use the Geophysical Archive Data Delivery System. Please read the terms and conditions associated with access to the data. The consistency of the Australian National Gravity Database is controlled by a set of more accurately observed gravity stations called the Fundamental Gravity Base Stations. These stations are in more than 200 locations throughout Australia and can be identified using Geoscience Australia's online maps page. To make full use of the gravity observations made in Australia and its offshore Territories these data must be collected into a single, consistent and reliable digital repository for the benefit of all Australians. This objective is being achieved through Geoscience Australia's Continental Geophysics project in a cooperative arrangement between Geoscience Australia, the State and Northern Territory Geological Surveys and mineral and petroleum exploration companies. The Continental Geophysics project will check and integrate data from all sources including companies submitting data to the Australian National Gravity Database. Related links |