1d25bbab-1a75-4f5d-8908-5f44b5e292c9 urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2026-01-23T07:05:01 creation ISO 19115 2016 National Gravity Compilation 2019 tilt grid 1d25bbab-1a75-4f5d-8908-5f44b5e292c9 Gravity data measure small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This National Gravity Compilation 2019 tilt grid is derived from the 2019 Australian National Gravity Grids A series. These gravity data were acquired under the project No. 202008. The grid has a cell size of 0.00417 degrees (approximately 435m). This gravity anomaly grid is derived from ground observations stored in the Australian National Gravity Database (ANGD) as at September 2019, supplemented with offshore data sourced from v28.1 of the Global Gravity grid developed using data from the Scripps Institution of Oceanography, the National Oceanic and Atmospheric Administration (NOAA), and National Geospatial-Intelligence Agency (NGA) at Scripps Institution of Oceanography, University of California San Diego. Out of the approximately 1.8 million gravity observations, nearly 1.4 million gravity stations in the ANGD with marina data were used to generate this grid. The ground gravity data used in this grid has been acquired by the Commonwealth, State and Territory Governments, the mining and exploration industry, universities and research organisations from the 1940's to the present day. Station spacing varies from approximately 11 km down to less than 1 km, with major parts of the continent having station spacing between 2.5 and 7 km. Terrain corrections to gravity were calculated using both offshore bathymetry and onshore topography data. A tilt filter was then applied to the complete spherical cap Bouguer anomaly (A series) to produce this grid covering Australia and its continental margins. {"type": "Polygon", "coordinates": [[[107.9979, -48.0021], [164.0021, -48.0021], [164.0021, -7.9979], [107.9979, -7.9979], [107.9979, -48.0021]]]} 107.9979 164.0021 -48.0021 -7.9979 A series Australia Bouguer EARTH SCIENCES Earth sciences GADDS2.0 NCI None Published_External complete digital data geophysical survey geophysics grav gravity grid ground marine national raster satellite spherical cap survey 202008 tilt File available for download in various formats from the GADDS2 portal documentDigital The Geophysical Archive Data Delivery System (GADDS2) portal provides HTTP download of geophysics datasets in a number of formats. Point and line datasets are available in NetCDF and ASEG-GDF2. Grid datasets are available in NetCDF, GeoTIFF and ERS. HTML National Gravity Compilation 2019 tilt grid file download documentDigital File download for National Gravity Compilation 2019 tilt grid application/x-netcdf National Gravity Compilation 2019 tilt grid NCSS documentDigital NetCDF Subsetting Service (NCSS) for National Gravity Compilation 2019 tilt grid HTML National Gravity Compilation 2019 tilt grid OPeNDAP documentDigital OPeNDAP web service for National Gravity Compilation 2019 tilt grid HTML National Gravity Compilation 2019 tilt grid WMS documentDigital OGC Web Mapping Service (WMS) for National Gravity Compilation 2019 tilt grid WMS National Gravity Compilation 2019 tilt grid WCS documentDigital OGC Web Coverage Service (WCS) for National Gravity Compilation 2019 tilt grid WCS