National Geophysical Grids Web Coverage ServiceWeb Coverage Service of Geoscience Australia's national geophysical grids for magnetics, gravity and radiometrics - 2015 edition. The service also contains outlines and descriptions of the airborne geophysical surveys used to compile the magnetic and radiometric grids.gravityairborne gravitymagnetismtotal magnetic intensity (TMI)airborne magneticsradiometricsairborne digital datageophysical surveygeophysicsgridAWAGSWCSAustraliaurn:ogc:service:wcs2.0.11.1.11.1.0http://www.opengis.net/spec/WCS/2.0/conf/corehttp://www.opengis.net/spec/WCS_protocol-binding_get-kvp/1.0.1http://www.opengis.net/spec/WCS_protocol-binding_post-xml/1.0http://www.opengis.net/spec/WCS_service-extension_crs/1.0/conf/crs-gridded-coveragehttp://www.opengis.net/spec/GMLCOV/1.0/conf/gml-coveragehttp://www.opengis.net/spec/GMLCOV/1.0/conf/special-formathttp://www.opengis.net/spec/GMLCOV/1.0/conf/multiparthttp://www.opengis.net/spec/WCS_service-extension_scaling/1.0/conf/scalinghttp://www.opengis.net/spec/WCS_service-extension_crs/1.0/conf/crshttp://www.opengis.net/spec/WCS_service-extension_interpolation/1.0/conf/interpolationhttp://www.opengis.net/spec/WCS_service-extension_interpolation/1.0/conf/interpolation-per-axishttp://www.opengis.net/spec/WCS_service-extension_interpolation/1.0/conf/nearest-neighborhttp://www.opengis.net/spec/WCS_service-extension_interpolation/1.0/conf/linearhttp://www.opengis.net/spec/WCS_service-extension_interpolation/1.0/conf/cubichttp://www.opengis.net/spec/WCS_service-extension_range-subsetting/1.0/conf/record-subsettingNONE© Commonwealth of Australia (Geoscience Australia) 2022. This product is released under the Creative Commons Attribution 4.0 International Licence. http://creativecommons.org/licenses/by/4.0/legalcodeGeoscience AustraliaClient Services+61 2 6249 9111GPO Box 378CanberraACT2601Australiaclientservices@ga.gov.auXMLapplication/gml+xmlimage/jpegimage/pngimage/tiffimage/tiff;application=geotifftext/plainhttp://www.opengis.net/def/crs/EPSG/0/4283http://www.opengis.net/def/crs/EPSG/0/4326http://www.opengis.net/def/crs/EPSG/0/3857http://www.opengis.net/def/crs/EPSG/0/20248http://www.opengis.net/def/crs/EPSG/0/20249http://www.opengis.net/def/crs/EPSG/0/20250http://www.opengis.net/def/crs/EPSG/0/20251http://www.opengis.net/def/crs/EPSG/0/20252http://www.opengis.net/def/crs/EPSG/0/20253http://www.opengis.net/def/crs/EPSG/0/20254http://www.opengis.net/def/crs/EPSG/0/20255http://www.opengis.net/def/crs/EPSG/0/20256http://www.opengis.net/def/crs/EPSG/0/20257http://www.opengis.net/def/crs/EPSG/0/20258http://www.opengis.net/def/crs/EPSG/0/28348http://www.opengis.net/def/crs/EPSG/0/28349http://www.opengis.net/def/crs/EPSG/0/28350http://www.opengis.net/def/crs/EPSG/0/28351http://www.opengis.net/def/crs/EPSG/0/28352http://www.opengis.net/def/crs/EPSG/0/28353http://www.opengis.net/def/crs/EPSG/0/28354http://www.opengis.net/def/crs/EPSG/0/28355http://www.opengis.net/def/crs/EPSG/0/28356http://www.opengis.net/def/crs/EPSG/0/28357http://www.opengis.net/def/crs/EPSG/0/28358http://www.opengis.net/def/crs/EPSG/0/32748http://www.opengis.net/def/crs/EPSG/0/32749http://www.opengis.net/def/crs/EPSG/0/32750http://www.opengis.net/def/crs/EPSG/0/32751http://www.opengis.net/def/crs/EPSG/0/32752http://www.opengis.net/def/crs/EPSG/0/32753http://www.opengis.net/def/crs/EPSG/0/32754http://www.opengis.net/def/crs/EPSG/0/32755http://www.opengis.net/def/crs/EPSG/0/32756http://www.opengis.net/def/crs/EPSG/0/32757http://www.opengis.net/def/crs/EPSG/0/32758http://www.opengis.net/def/crs/EPSG/0/3110http://www.opengis.net/def/crs/EPSG/0/3111http://www.opengis.net/def/crs/EPSG/0/3112http://www.opengis.net/def/crs/EPSG/0/3031http://www.opengis.net/def/crs/EPSG/0/3032http://www.opengis.net/def/crs/EPSG/0/3308http://www.opengis.net/def/crs/EPSG/0/3107http://www.opengis.net/def/interpolation/OGC/1/nearest-neighborhttp://www.opengis.net/def/interpolation/OGC/1/linearhttp://www.opengis.net/def/interpolation/OGC/1/cubicAmbient noise tomography of AusArray year one data at frequency 0.0500HzAmbient noise tomography (ANT) of AusArray year one data at frequency 0.0500Hz. Data were obtained from 119 broad band seismic stations in northern Australia. This deployment was part of the Australian Passive Seismic Array (AusArray) Project. Data from these stations were used to image the seismic structure using various techniques, including ambient noise tomography.ambient noise tomographyANTAusArraygeophys__ant_ausarray_year_one_0-0500hzRectifiedGridCoverage130.9875 -23.0125143.0125 -15.9875130.9875 -23.0125143.0125 -15.9875Ambient noise tomography of AusArray year one data at frequency 0.0625HzAmbient noise tomography (ANT) of AusArray year one data at frequency 0.0625Hz. Data were obtained from 119 broad band seismic stations in northern Australia. This deployment was part of the Australian Passive Seismic Array (AusArray) Project. Data from these stations were used to image the seismic structure using various techniques, including ambient noise tomography.ambient noise tomographyANTAusArraygeophys__ant_ausarray_year_one_0-0625hzRectifiedGridCoverage130.9875 -23.0125143.0125 -15.9875130.9875 -23.0125143.0125 -15.9875Ambient noise tomography of AusArray year one data at frequency 0.0833HzAmbient noise tomography (ANT) of AusArray year one data at frequency 0.0833Hz. Data were obtained from 119 broad band seismic stations in northern Australia. This deployment was part of the Australian Passive Seismic Array (AusArray) Project. Data from these stations were used to image the seismic structure using various techniques, including ambient noise tomography.ambient noise tomographyANTAusArraygeophys__ant_ausarray_year_one_0-0833hzRectifiedGridCoverage130.9875 -23.0125143.0125 -15.9875130.9875 -23.0125143.0125 -15.9875Ambient noise tomography of AusArray year one data at frequency 0.1000HzAmbient noise tomography (ANT) of AusArray year one data at frequency 0.1000Hz. Data were obtained from 119 broad band seismic stations in northern Australia. This deployment was part of the Australian Passive Seismic Array (AusArray) Project. Data from these stations were used to image the seismic structure using various techniques, including ambient noise tomography.ambient noise tomographyANTAusArraygeophys__ant_ausarray_year_one_0-1000hzRectifiedGridCoverage130.9875 -23.0125143.0125 -15.9875130.9875 -23.0125143.0125 -15.9875Ambient noise tomography of AusArray year one data at frequency 0.1250HzAmbient noise tomography (ANT) of AusArray year one data at frequency 0.1250Hz. Data were obtained from 119 broad band seismic stations in northern Australia. This deployment was part of the Australian Passive Seismic Array (AusArray) Project. Data from these stations were used to image the seismic structure using various techniques, including ambient noise tomography.ambient noise tomographyANTAusArraygeophys__ant_ausarray_year_one_0-1250hzRectifiedGridCoverage130.9875 -23.0125143.0125 -15.9875130.9875 -23.0125143.0125 -15.9875Ambient noise tomography of AusArray year one data at frequency 0.1667HzAmbient noise tomography (ANT) of AusArray year one data at frequency 0.1667Hz. Data were obtained from 119 broad band seismic stations in northern Australia. This deployment was part of the Australian Passive Seismic Array (AusArray) Project. Data from these stations were used to image the seismic structure using various techniques, including ambient noise tomography.ambient noise tomographyANTAusArraygeophys__ant_ausarray_year_one_0-1667hzRectifiedGridCoverage130.9875 -23.0125143.0125 -15.9875130.9875 -23.0125143.0125 -15.9875Ambient noise tomography of AusArray year one data at frequency 0.2000HzAmbient noise tomography (ANT) of AusArray year one data at frequency 0.2000Hz. Data were obtained from 119 broad band seismic stations in northern Australia. This deployment was part of the Australian Passive Seismic Array (AusArray) Project. Data from these stations were used to image the seismic structure using various techniques, including ambient noise tomography.ambient noise tomographyANTAusArraygeophys__ant_ausarray_year_one_0-2000hzRectifiedGridCoverage130.9875 -23.0125143.0125 -15.9875130.9875 -23.0125143.0125 -15.9875Ambient noise tomography of AusArray year one data at frequency 0.2500HzAmbient noise tomography (ANT) of AusArray year one data at frequency 0.2500Hz. Data were obtained from 119 broad band seismic stations in northern Australia. This deployment was part of the Australian Passive Seismic Array (AusArray) Project. Data from these stations were used to image the seismic structure using various techniques, including ambient noise tomography.ambient noise tomographyANTAusArraygeophys__ant_ausarray_year_one_0-2500hzRectifiedGridCoverage130.9875 -23.0125143.0125 -15.9875130.9875 -23.0125143.0125 -15.9875Complete Bouguer Anomaly - A SeriesThis Complete Bouguer Anomaly (CBA) grid is produced from the "A" Series grids, which were produced from a combination of ground gravity data for Australian onshore locations, gravity data derived from satellite altimetry for offshore locations, and gravity data from the EGM2008 global gravity model for the onshore locations in countries other than Australia.AustraliagridFree Air Anomalygravitygeophys__2019_A4_CBARectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666667 -48.00208337360861164.00208333333336 -7.997916667278789Complete Bouguer Anomaly 2019 - B SeriesThis Complete Bouguer Anomaly (CBA) grid is produced from the "B" Series grids, which were produced using the gravity data in the A Series grids but also include data from a number of airborne gravity and airborne gravity gradiometer surveys.hillshadeBouguerAustraliagridgravitygeophys__2019_B4_CBARectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666667 -48.00208337360861164.00208333333336 -7.997916667278789Complete Bouguer Anomaly Wide Linear Colour Hillshade 2019 - A SeriesThis Complete Bouguer Anomaly (CBA) Hillshade HSI image is produced from the "A" Series grids, which were produced from a combination of ground gravity data for Australian onshore locations, gravity data derived from satellite altimetry for offshore locations, and gravity data from the EGM2008 global gravity model for the onshore locations in countries other than Australia.hillshadeBouguerAustraliaimagegravitygeophys__2019_A4_CBA_wide_linear_color_Hillshade_HSI_GeoTIFFRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666665 -48.002083373608606164.00208333333333 -7.99791666727879Complete Bouguer Anomaly Wide Linear Colour Hillshade 2019 - B SeriesThis Complete Bouguer Anomaly (CBA) Hillshade HSI image is produced from the "B" Series grids, which were produced using the gravity data in the A Series grids but also include data from a number of airborne gravity and airborne gravity gradiometer surveys.hillshadeBouguerAustraliaimagegravitygeophys__2019_B4_CBA_wide_linear_color_Hillshade_HSI_GeoTIFFRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666665 -48.002083373608606164.00208333333333 -7.99791666727879Continental Scale AusArray Ambient Noise Tomography GridThis layer provides an ambient noise tomography map of the Australian continent at 0.4 Hz (2.5 seconds), which is sensitive to the top 3 km of the Earth’s crust. The map is a result of preliminary modelling of data from the Exploring for the Future program, AusArray 2° deployment, providing improved resolution across the country. Citation: Hejrani B., Hassan R., Gorbatov A. & Zhao J., 2024. Towards continental-scale ambient noise tomography of Australia: a preliminary result from AusArray data. In: Czarnota, K. (ed.) Exploring for the Future: Extended Abstracts, Geoscience Australia, Canberra, https://doi.org/10.26186/149637Ambient Noise TomographyANTAusArraygeophys__ant_ausarray_continental_scaleRectifiedGridCoverage112.9875 -44.0125155.0125 -10.9875112.9875 -44.0125155.0125 -10.9875De-trended Global Isostatic Residual - A SeriesThis de-trended global isostatic residual grid produced from the "A" Series grids, which were produced from a combination of ground gravity data for Australian onshore locations, gravity data derived from satellite altimetry for offshore locations, and gravity data from the EGM2008 global gravity model for the onshore locations in countries other than Australia.hillshadegridAustraliagravitygeophys__2019_A7_DGIR_v2RectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666667 -48.00208337360861164.00208333333336 -7.997916667278789De-trended Global Isostatic Residual 2019 - B SeriesThis de-trended global isostatic residual grid is produced from the "B" Series grids, which were produced using the gravity data in the "A" Series grids but also include data from a number of airborne gravity and airborne gravity gradiometer surveys.gridgeophysicsisostaticgravityAustraliageophys__2019_B7_DGIR_v2RectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666667 -48.00208337360861164.00208333333336 -7.997916667278789De-trended Global Isostatic Residual Hillshade 2019 - A SeriesThis de-trended global isostatic residual hillshade image is produced from the "A" Series grids, which were produced from a combination of ground gravity data for Australian onshore locations, gravity data derived from satellite altimetry for offshore locations, and gravity data from the EGM2008 global gravity model for the onshore locations in countries other than Australia.hillshadeimageAustraliagravitygeophys__2019_A7_DGIR_Hillshade_HSI_GeoTIFFRectifiedGridCoverage107.9979167 -48.00240336700001164.0025314 -7.9979166669999975107.9979167 -48.00240340727514164.0025314 -7.997916667612118De-trended Global Isostatic Residual Hillshade 2019 - B SeriesThis de-trended global isostatic residual hillshade image is produced from the "B" Series grids, which were produced using the gravity data in the "A" Series grids but also include data from a number of airborne gravity and airborne gravity gradiometer surveys.hillshadeAustraliageophysicsisostaticgravitygeophys__2019_B7_DGIR_Hillshade_HSI_GeoTIFFRectifiedGridCoverage107.9979167 -48.00240336700001164.0025314 -7.9979166669999975107.9979167 -48.00240340727514164.0025314 -7.997916667612118Elevation of the A Series observation surface relative to the ellipsoid vertical datumThis grid provides the elevation values that define the observation surface for the "A" series grids relative to the GRS80 ellipsoid for the GDA94 datum. The "A" Series grids were produced from a combination of ground gravity data for Australian onshore locations, gravity data derived from satellite altimetry for offshore locations, and gravity data from the EGM2008 global gravity model for the onshore locations in countries other than Australia.Australiaellipsoidgridgeophysicsgravitygeophys__Surface2019_ellipsoidRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666667 -48.00208337360861164.00208333333336 -7.997916667278789Elevation of the A Series observation surface relative to the geoid vertical datumThis grid provides the elevation values that define the observation surface for the "A" series grids relative to the geoid. The "A" Series grids were produced from a combination of ground gravity data for Australian onshore locations, gravity data derived from satellite altimetry for offshore locations, and gravity data from the EGM2008 global gravity model for the onshore locations in countries other than Australia.Australiageoidgridgeophysicsgravitygeophys__Surface2019_geoidRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666667 -48.00208337360861164.00208333333336 -7.997916667278789Elevation of the B Series observation surface relative to the ellipsoid vertical datumThis grid provides the elevation values that define the observation surface for the "B" series grids relative to the GRS80 ellipsoid for the GDA94 datum. The "B" Series grids were produced using the gravity data in the A Series grids but also include data from a number of airborne gravity and airborne gravity gradiometer surveys.Australiageoidgridgravitygeophys__AusDrape2019_ellipsoidRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666667 -48.00208337360861164.00208333333336 -7.997916667278789Elevation of the B Series observation surface relative to the geoid vertical datum.This grid provides the elevation values that define the observation surface for the "B" series grids relative to the geoid. The "B" Series grids were produced using the gravity data in the A Series grids but also include data from a number of airborne gravity and airborne gravity gradiometer surveys.Australiageoidgridgravitygeophys__AusDrape2019_geoidRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666667 -48.00208337360861164.00208333333336 -7.997916667278789Filtered Potassium Element Concentrations grid of Australia 2019The filtered potassium grid is a derivative of the 2019 radiometric or gamma-ray grid of Australia. The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium, uranium and thorium. The data are collected on airborne geophysical surveys conducted by Commonwealth, State and Northern Territory Governments and the private sector. The 2019 filtered potassium grid has a cell size of about 100m (0.001 degrees) and shows potassium element concentrations of the Australia region. It was obtained by applying a low-pass filter to the original potassium grid. Potassium is the seventh most abundant element in the Earth's crust. This potassium concentration grid can be used to locate minerals and compounds containing potassium.PotassiumAustraliaNational Geophysical CompilationRadiometricsGeophysicsGridEarth SciencesNCIgeophys__radmap_v4_2019_filtered_pctkRectifiedGridCoverage112.8995 -43.7605153.6705 -8.9995112.8995 -43.760500040810406153.6705 -8.999500000938232Filtered Thorium Element Concentrations grid of Australia 2019The filtered thorium grid is a derivative of the 2019 radiometric or gamma-ray grid of Australia. The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data are collected on airborne geophysical surveys conducted by Commonwealth, State and Northern Territory Governments and the private sector. The 2019 filtered thorium grid was derived by seamlessly merging over 600 airborne gamma-ray spectrometric surveys. The final grid has a cell size of about 100m (0.001 degrees) and shows thorium element concentrations of the Australia region.Airborne Digital DataAustraliaNational Geophysical CompilationRadiometricsGeophysicsGridThoriumEarth Sciencesgeophys__radmap_v4_2019_filtered_ppmthRectifiedGridCoverage112.8995 -43.7605153.6705 -8.9995112.8995 -43.760500040810406153.6705 -8.999500000938232Filtered Uranium Element Concentrations grid of Australia 2019The filtered uranium grid is a derivative of the 2019 radiometric or gamma-ray grid of Australia. The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data are collected on airborne geophysical surveys conducted by Commonwealth, State and Northern Territory Governments and the private sector. The 2019 filtered uranium grid was derived by seamlessly merging over 600 airborne gamma-ray spectrometric surveys. The final grid has a cell size of about 100m (0.001 degrees) and shows uranium element concentrations of the Australia region.UraniumNational Geophysical CompilationRadiometricsGeophysicsGridAirborne Digital Data RadiometricsEarth SciencesNCIgeophys__radmap_v4_2019_filtered_ppmuRectifiedGridCoverage112.8995 -43.7605153.6705 -8.9995112.8995 -43.760500040810406153.6705 -8.999500000938232Filtered terrestrial Dose rate grid of Australia 2019The filtered terrestrial dose rate grid is a derivative of the 2019 radiometric or gamma-ray grid of Australia, made of a combination of over 600 individual survey grids. The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data are collected on airborne geophysical surveys conducted by Commonwealth, State and Northern Territory Governments and the private sector. The terrestrial dose rate grid is derived as a linear combination of the filtered K, U and Th grids. A low pass filter is applied to the unfiltered grid to generate the filtered terrestrial dose rate grid. The grid cell size is about 100m (0.001 degrees).Airborne Digital DataNCIAustraliaNational Geophysical CompilationRadiometricsGeophysicsGridEarth SciencesTerrestrial Dose Rategeophys__radmap_v4_2019_filtered_doseRectifiedGridCoverage112.8995 -43.7605153.6705 -8.9995112.8995 -43.760500040810406153.6705 -8.999500000938232Free Air Anomaly 2019 - A SeriesThis Free Air Anomaly (FAA) grid is produced from the "A" Series grids, which were produced from a combination of ground gravity data for Australian onshore locations, gravity data derived from satellite altimetry for offshore locations, and gravity data from the EGM2008 global gravity model for the onshore locations in countries other than Australia.AustraliaimageFree Air Anomalygravitygeophys__2019_A1_FAARectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666667 -48.00208337360861164.00208333333336 -7.997916667278789Free Air Anomaly 2019 - B SeriesThis Free Air Anomaly (FAA) grid is produced from the "B" Series grids, which were produced using the gravity data in the A Series grids but also include data from a number of airborne gravity and airborne gravity gradiometer surveys.hillshadeBouguerAustraliagridgravitygeophys__2019_B1_FAARectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666667 -48.00208337360861164.00208333333336 -7.997916667278789Free Air Anomaly Hillshade 2019 - A SeriesThis Free Air Anomaly (FAA) Hillshade HSI image is produced from the "A" Series grids, which were produced from a combination of ground gravity data for Australian onshore locations, gravity data derived from satellite altimetry for offshore locations, and gravity data from the EGM2008 global gravity model for the onshore locations in countries other than Australia.hillshadeAustraliaimageFree Air Anomalygravitygeophys__2019_A1_FAA_Hillshade_HSI_GeoTIFFRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666665 -48.002083373608606164.00208333333333 -7.99791666727879Free Air Anomaly Hillshade 2019 - B SeriesThis Free Air Anomaly (FAA) Hillshade HSI image is produced from the "B" Series grids, which were produced using the gravity data in the A Series grids but also include data from a number of airborne gravity and airborne gravity gradiometer surveys.hillshadeBouguerAustraliaimagegravitygeophys__2019_B1_FAA_Hillshade_HSI_GeoTIFFRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666665 -48.002083373608606164.00208333333333 -7.99791666727879Gravity Anomaly greyscale image of the Australian Region - 2010The gravity anomaly grid (2010) represents gravity anomalies of the Australian continent and surrounding region. The grid combines accurate onshore gravity measurements, with satellite data over the offshore region. The cell values represent simple Bouguer anomalies at a density of 2.67 tonnes per cubic metre onshore and free-air anomalies offshore. The grid cell size is 0.5 minutes of arc, which is equivalent to about 800 metres.gravitygeophysicsimageAustraliageophys__Aust_gravity_anomaly_2010RectifiedGridCoverage99.96416649999999 -51.9490745169.9696995 -7.98416650000000199.96416649999999 -51.9490745169.9696995 -7.984166500000001Gravity Anomaly image 2010 - HSI colourHue-Saturation-Intensity (HSI) colour image of the national Gravity Anomaly grid, 2010. This image is made from a grid that represents gravity anomalies of the Australian region. The grid combines accurate onshore gravity measurements, with satellite data over the offshore region. The cell values represent simple Bouguer anomalies at a density of 2.67 tonnes per cubic metre onshore and free-air anomalies offshore. The grid cell size is 0.5 minutes of arc, which is equivalent to about 800 metres.BouguergravitygeophysicsimageAustraliageophys__Aust_gravity_bandpass_hsi_image_2009RectifiedGridCoverage109.91145110930562 -50.60323401125593160.61705110930563 -7.870434011255909109.91145110930562 -50.60323401125593160.61705110930563 -7.870434011255909Gravity Bouguer Onshore greyscale image - 2010The onshore Bouguer gravity grid (2010) represents gravity anomalies of the Australian continent and surrounding region. The cell values represent simple Bouguer anomalies at a density of 2.67 tonnes per cubic metre. The grid cell size is 0.5 minutes of arc, which is equivalent to about 800 metres.BouguergravitygeophysicsimageAustraliageophys__Aust_onshore_only_Bouguer_gravity_2010RectifiedGridCoverage112.86796049999998 -43.7028145153.6246635 -8.987536500000001112.86796049999998 -43.7028145153.6246635 -8.987536500000001Hillshade image of the elevation of the A Series observation surface relative to the ellipsoid vertical datumThis hillshade image provides the elevation values that define the observation surface for the "A" series grids relative to the GRS80 ellipsoid for the GDA94 datum. The "A" Series grids were produced from a combination of ground gravity data for Australian onshore locations, gravity data derived from satellite altimetry for offshore locations, and gravity data from the EGM2008 global gravity model for the onshore locations in countries other than Australia.Australiaellipsoidimagegeophysicsgravitygeophys__Surface2019_ellipsoid_Hillshade_HSI_GeoTIFFRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666665 -48.002083373608606164.00208333333333 -7.99791666727879Hillshade image of the elevation of the A Series observation surface relative to the geoid vertical datumThis hillshade image provides the elevation values that define the observation surface for the "A" series grids relative to the geoid. The "A" Series grids were produced from a combination of ground gravity data for Australian onshore locations, gravity data derived from satellite altimetry for offshore locations, and gravity data from the EGM2008 global gravity model for the onshore locations in countries other than Australia.Australiageoidimagegeophysicsgravitygeophys__Surface2019_geoid_Hillshade_HSI_GeoTIFFRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666665 -48.002083373608606164.00208333333333 -7.99791666727879Hillshade image of the elevation of the B Series observation surface relative to the ellipsoid vertical datumThis hillshade image provides the elevation values that define the observation surface for the "B" series grids relative to the GRS80 ellipsoid for the GDA94 datum. The "B" Series grids were produced using the gravity data in the A Series grids but also include data from a number of airborne gravity and airborne gravity gradiometer surveys.hillshadeAustraliageoidimagegravitygeophys__AusDrape2019_ellipsoid_Hillshade_HSI_GeoTIFFRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666665 -48.002083373608606164.00208333333333 -7.99791666727879Hillshade image of the elevation of the B Series observation surface relative to the geoid vertical datum.This hillshade image provides the elevation values that define the observation surface for the "B" series grids relative to the geoid. The "B" Series grids were produced using the gravity data in the A Series grids but also include data from a number of airborne gravity and airborne gravity gradiometer surveys.hillshadeAustraliageoidimagegravitygeophys__AusDrape2019_geoid_Hillshade_HSI_GeoTIFFRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666665 -48.002083373608606164.00208333333333 -7.99791666727879Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - TMI RTP 0.5VD gridThis layer is a half vertical derivative of the Total Magnetic Intensity grid for the Magnetic Anomaly Map of Australia, Seventh Edition, 2019. The 2019 Total magnetic Intensity (TMI) grid of Australia has a grid cell size of ~3 seconds of arc (approximately 80 m). This grid only includes airborne-derived TMI data for onshore and near-offshore continental areas. Since the sixth edition was released in 2015, data from 234 new surveys have been added to the database, acquired mainly by the State and Territory Geological Surveys. The new grid was derived from a re-levelling of the national magnetic grid database. The survey grids were levelled to each other, and to the Australia Wide Airborne Geophysical Survey (AWAGS), which serves as a baseline to constrain long wavelengths in the final grid. It is estimated that 33 500 000 line-kilometres of survey data were acquired to produce the 2019 grid data, about 2 000 000 line-kilometres more than for the previous edition. The grid has units of nanoTesla per km (or nT/km). The RTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-15 geomagnetic reference model using a data representative date and elevation representative of the survey. A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the half vertical derivative grid.magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_05VDRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - TMI RTP 1VD grid (AWAGS)This layer has a grid cell size of ~3 seconds of arc (approximately 80 m). This grid only includes airborne-derived TMI data for onshore and near-offshore continental areas. Since the sixth edition was released in 2015, data from 234 new surveys have been added to the database, acquired mainly by the State and Territory Geological Surveys. The new grid was derived from a re-levelling of the national magnetic grid database. The survey grids were levelled to each other, and to the Australia Wide Airborne Geophysical Survey (AWAGS), which serves as a baseline to constrain long wavelengths in the final grid. It is estimated that 33 500 000 line-kilometres of survey data were acquired to produce the 2019 grid, about 2 000 000 line-kilometres more than for the previous edition. The data 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.magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_1VDRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - TMI RTP AS gridThis layer has a grid cell size of ~3 seconds of arc (approximately 80 m). This grid only includes airborne-derived TMI data for onshore and near-offshore continental areas. Since the sixth edition was released in 2015, data from 234 new surveys have been added to the database, acquired mainly by the State and Territory Geological Surveys. The new grid was derived from a re-levelling of the national magnetic grid database. The survey grids were levelled to each other, and to the Australia Wide Airborne Geophysical Survey (AWAGS), which serves as a baseline to constrain long wavelengths in the final grid. It is estimated that 33 500 000 line-kilometres of survey data were acquired to produce the 2019 grid, about 2 000 000 line-kilometres more than for the previous edition.magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_ASRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - TMI RTP grid (Psusp)This layer has a grid cell size of ~3 seconds of arc (approximately 80 m). This grid only includes airborne-derived TMI data for onshore and near-offshore continental areas. Since the sixth edition was released in 2015, data from 234 new surveys have been added to the database, acquired mainly by the State and Territory Geological Surveys. The 2019 national grid was derived from a re-levelling of the national magnetic grid database. The survey grids were levelled to each other, and to the Australia Wide Airborne Geophysical Survey (AWAGS), which serves as a baseline to constrain long wavelengths in the final grid. It is estimated that 33 500 000 line-kilometres of survey data were acquired to produce the 2019 grid data, about 2 000 000 line-kilometres more than for the previous edition. The data 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.magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_pSUSPRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - TMI RTP image (Phase)This layer has a grid cell size of ~3 seconds of arc (approximately 80 m). This grid only includes airborne-derived TMI data for onshore and near-offshore continental areas. Since the sixth edition was released in 2015, data from 234 new surveys have been added to the database, acquired mainly by the State and Territory Geological Surveys. The 2019 national grid was derived from a re-levelling of the national magnetic grid database. The survey grids were levelled to each other, and to the Australia Wide Airborne Geophysical Survey (AWAGS), which serves as a baseline to constrain long wavelengths in the final grid. It is estimated that 33 500 000 line-kilometres of survey data were acquired to produce the 2019 grid data, about 2 000 000 line-kilometres more than for the previous edition. The data 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.magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_PhaseRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity gridmagneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_pGRAVRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - upward continued grid (UC0m500mRes)This layer has a grid cell size of 0.00083 degrees (approximately 88m).The data are in nanoTesla (or nT). It is estimated that 33 500 000 line-kilometres of survey data collected by State and Territory geological surveys and Geoscience Australia were acquired to produce the 2019 national magnetic grid. The data has had a variable reduction to the pole applied to centre the magnetic anomaly over the magnetised body. The VRTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-15 geomagnetic reference model using a data representative date and elevation representative of the survey. The upward continuation manipulates the magnetic data to enhance the large deep source anomalies and minimises shallow anomalies. To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid. This survey grid is essentially levelled to AWAGS.magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_uc0m500mresRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - upward continued grid (UC12km16kmRes)This layer has a grid cell size of 0.00083 degrees (approximately 88m).The data are in nanoTesla (or nT). It is estimated that 33 500 000 line-kilometres of survey data collected by State and Territory geological surveys and Geoscience Australia were acquired to produce the 2019 national magnetic grid. The data has had a variable reduction to the pole applied to centre the magnetic anomaly over the magnetised body. The VRTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-15 geomagnetic reference model using a data representative date and elevation representative of the survey. The upward continuation manipulates the magnetic data to enhance the large deep source anomalies and minimises shallow anomalies. To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid. This survey grid is essentially levelled to AWAGS.magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_uc12km16kmresRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - upward continued grid (UC16km20kmRes)magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_uc16km20kmresRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - upward continued grid (UC1km2kmRes)magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_uc1km2kmresRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - upward continued grid (UC24km30kmRes)magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_uc24km30kmresRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - upward continued grid (UC2km4kmRes)This layer has a grid cell size of 0.00083 degrees (approximately 88m).The data are in nanoTesla (or nT). It is estimated that 33 500 000 line-kilometres of survey data collected by State and Territory geological surveys and Geoscience Australia were acquired to produce the 2019 national magnetic grid. The data has had a variable reduction to the pole applied to centre the magnetic anomaly over the magnetised body. The VRTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-15 geomagnetic reference model using a data representative date and elevation representative of the survey. The upward continuation manipulates the magnetic data to enhance the large deep source anomalies and minimises shallow anomalies. To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid. This survey grid is essentially levelled to AWAGS.magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_uc2km4kmresRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - upward continued grid (UC36km42kmRes)This layer has a grid cell size of 0.00083 degrees (approximately 88m).The data are in nanoTesla (or nT). It is estimated that 33 500 000 line-kilometres of survey data collected by State and Territory geological surveys and Geoscience Australia were acquired to produce the 2019 national magnetic grid. The data has had a variable reduction to the pole applied to centre the magnetic anomaly over the magnetised body. The VRTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-15 geomagnetic reference model using a data representative date and elevation representative of the survey. The upward continuation manipulates the magnetic data to enhance the large deep source anomalies and minimises shallow anomalies. To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid. This survey grid is essentially levelled to AWAGS.magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_uc36km42kmresRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - upward continued grid (UC4km8kmRes)This layer has a grid cell size of 0.00083 degrees (approximately 88m).The data are in nanoTesla (or nT). It is estimated that 33 500 000 line-kilometres of survey data collected by State and Territory geological surveys and Geoscience Australia were acquired to produce the 2019 national magnetic grid. The data has had a variable reduction to the pole applied to centre the magnetic anomaly over the magnetised body. The VRTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-15 geomagnetic reference model using a data representative date and elevation representative of the survey. The upward continuation manipulates the magnetic data to enhance the large deep source anomalies and minimises shallow anomalies. To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid. This survey grid is essentially levelled to AWAGS.magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_uc4km8kmresRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - upward continued grid UC42km50kmRes (UC42km50kmRes)This layer has a grid cell size of 0.00083 degrees (approximately 88m).The data are in nanoTesla (or nT). It is estimated that 33 500 000 line-kilometres of survey data collected by State and Territory geological surveys and Geoscience Australia were acquired to produce the 2019 national magnetic grid. The data has had a variable reduction to the pole applied to centre the magnetic anomaly over the magnetised body. The VRTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-15 geomagnetic reference model using a data representative date and elevation representative of the survey. The upward continuation manipulates the magnetic data to enhance the large deep source anomalies and minimises shallow anomalies. To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid. This survey grid is essentially levelled to AWAGS.magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_uc42km50kmresRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - upward continued grid UC8km12kmRes (UC8km12kmRes)This layer has a grid cell size of 0.00083 degrees (approximately 88m).The data are in nanoTesla (or nT). It is estimated that 33 500 000 line-kilometres of survey data collected by State and Territory geological surveys and Geoscience Australia were acquired to produce the 2019 national magnetic grid. The data has had a variable reduction to the pole applied to centre the magnetic anomaly over the magnetised body. The VRTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-15 geomagnetic reference model using a data representative date and elevation representative of the survey. The upward continuation manipulates the magnetic data to enhance the large deep source anomalies and minimises shallow anomalies. To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid. This survey grid is essentially levelled to AWAGS.magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_uc8km12kmresRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - vBzz (PGravTHD) gridThis layer has a cell size of 0.00083 degrees (approximately 88m). The data are in nanoTesla per metre (or nT/m). To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid. This survey grid is essentially levelled to AWAGS. The data has had a variable reduction to the pole applied to centre the magnetic anomaly over the magnetised body. The VRTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-15 geomagnetic reference model using a data representative date and elevation representative of the survey. A further enhancement has been completed to enhance the geological interpretation of the data.magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_pGRAV_THDRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - vBzz gridThis layer has a grid cell size of 0.00083 degrees (approximately 88m).The data are in nanoTesla per metre (or nT/m). To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid. This survey grid is essentially levelled to AWAGS. The data has had a variable reduction to the pole applied to centre the magnetic anomaly over the magnetised body. The VRTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-15 geomagnetic reference model using a data representative date and elevation representative of the survey. A further enhancement has been completed to enhance the geological interpretation of the data.magneticsgridgeophysicsAustraliageophys__magmap_v7_2019_VRTP_VBzzRectifiedGridCoverage105.99958334997916 -43.93009904998639154.66347004997917 -9.02649524998639105.99958334997916 -43.93009909082764154.66347004997917 -9.026495250934511National Gravity Compilation 2019 (CSCBA 1VD grid)Australiagravitygridgeophys__Gravmap2019-grid-grv_cscba_1vdRectifiedGridCoverage107.99791666633806 -48.002083333365334164.00208333304954 -7.997916666666667107.99791666633806 -48.00208337364061164.00208333304954 -7.997916667278788National Gravity Compilation 2019 (CSCBA)Australiagravitygridgeophys__Gravmap2019-grid-grv_cscbaRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666667 -48.00208337360861164.00208333333336 -7.997916667278789National Gravity Compilation 2019 (free air grid)Gravity data measures 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 (free air grid) is a free air anomaly grid for the 2019 Australian National Gravity Grids A series. This gravity survey was acquired under the project No. 202008. 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 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. The grid shows free air anomalies over Australia and its continental margins with a cell size of 0.00417 degrees (approximately 435m). The data are given in units of um/s^2, also known as 'gravity units', or gu.Australiagravitygridgeophys__Gravmap2019-grid-grv_faRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666667 -48.00208337360861164.00208333333336 -7.997916667278789National Gravity Compilation 2019 - CSCBA 0.5VD gridGravity 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 - CSCBA 0.5VD 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 by 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 together with Airborne Gravity surveys totaling 345,000 line km and 106,000 line km of Airborne Gravity Gradiometry were used to generate this grid. The ground gravity data used in the national 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. The grid shows half derivative of the complete Bouguer anomalies over Australia and its continental margins. A half vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the complete spherical cap Bouguer anomaly grid of the 2019 Australian National Gravity Grids A series to produce this grid.Australiagravitygridgeophys__Gravmap2019-grid-grv_cscba_05vdRectifiedGridCoverage107.99791666633806 -48.002083333365334164.00208333304954 -7.997916666666667107.99791666633806 -48.00208337364061164.00208333304954 -7.997916667278788National Gravity Compilation 2019 DGIR 0.5VD gridGravity 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 DGIR 0.5VD grid is produced 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). The data are derived from ground observations stored in the Australian National Gravity Database (ANGD) as at September 2019, supplemented by 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 together with marine 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 for ground observations 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. The grid shows the half vertical derivative of the de-trended global isostatic residual anomalies (A series) over Australia and its continental margins. The original DGIR was obtained by subtracting 3 quantities (i.e., the near-field isostatic correction, the far-field isostatic correction, and a first order trend correction) from Complete Bouguer Anomaly data (CBA) of the 2019 Australian National Gravity Grids A series. A half vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the DGIR grid of the 2019 Australian National Gravity Grids to produce this grid.Australiagravitygridgeophys__Gravmap2019-grid-grv_dtgir_05vdRectifiedGridCoverage107.99791666633806 -48.002083333365334164.00208333304954 -7.997916666666667107.99791666633806 -48.00208337364061164.00208333304954 -7.997916667278788National Gravity Compilation 2019 DGIR 1VD gridGravity 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 DGIR 1VD grid is produced 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). The data are derived from ground observations stored in the Australian National Gravity Database (ANGD) as at September 2019, supplemented by 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 together with marine 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 for ground observations 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. The grid shows the first vertical derivative of the de-trended global isostatic residual anomalies (A series) over Australia and its continental margins. The original DGIR was obtained by subtracting 3 quantities (i.e., the near-field isostatic correction, the far-field isostatic correction, and a first order trend correction) from Complete Bouguer Anomaly data (CBA) of the 2019 Australian National Gravity Grids A series. A first vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the DGIR grid of the 2019 Australian National Gravity Grids to produce this grid.Australiagravitygridgeophys__Gravmap2019-grid-grv_dtgir_1vdRectifiedGridCoverage107.99791666633806 -48.002083333365334164.00208333304954 -7.997916666666667107.99791666633806 -48.00208337364061164.00208333304954 -7.997916667278788National Gravity Compilation 2019 DGIR gridGravity 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 DGIR grid is produced 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). The data are given in units of um/s^2, also known as 'gravity units', or gu. The data are derived from ground observations stored in the Australian National Gravity Database (ANGD) as at September 2019, supplemented by 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 together with marine 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 for ground observations 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. The grid shows de-trended global isostatic residual anomalies (A series) over Australia and its continental margins. This National Gravity Compilation 2019 DGIR grid (DGIR) was obtained by subtracting 3 quantities (i.e., the near-field isostatic correction, the far-field isostatic correction, and a first order trend correction) from Complete Bouguer Anomaly data (CBA) of the 2019 Australian National Gravity Grids A series.Australiagravitygridgeophys__Gravmap2019-grid-grv_dtgirRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666667 -48.00208337360861164.00208333333336 -7.997916667278789National Gravity Compilation 2019 DGIR tilt gridGravity 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 DGIR tilt grid is produced 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). The data are derived from ground observations stored in the Australian National Gravity Database (ANGD) as at September 2019, supplemented by 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 together with marine data were used to generate this grid. The ground gravity data used in the national 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 for ground observations 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. The DGIR was obtained by subtracting 3 quantities (i.e., the near-field isostatic correction, the far-field isostatic correction, and a first order trend correction) from Complete Bouguer Anomaly data (CBA) of the 2019 Australian National Gravity Grids A series. The grid shows a tilt of the de-trended global isostatic residual (DGIR) anomalies (A series) over Australia and its continental margins. A tilt filter was calculated by applying a fast Fourier transform (FFT) process to the DGIR grid of the 2019 Australian National Gravity Grids A series. A tilt filter is a ratio of the vertical derivative to the total horizontal derivative and is used for detection of edges of geological units.Australiagravitygridgeophys__Gravmap2019-grid-grv_dtgir_tiltRectifiedGridCoverage107.99791666666667 -48.002083333365334164.00208333337815 -7.997916666666667107.99791666666667 -48.00208337364061164.00208333337815 -7.997916667278788National Gravity Compilation 2019 includes airborne (CSCBA 1VD)Australiagravitygridgeophys__Gravmap2019-grid-grv_cscba_1vd-IncludesAirborneRectifiedGridCoverage107.99791666666667 -48.002083333365334164.00208333337815 -7.997916666666667107.99791666666667 -48.00208337364061164.00208333337815 -7.997916667278788National Gravity Compilation 2019 includes airborne (CSCBA)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 includes airborne (CSCBA) is a complete spherical cap Bouguer anomaly grid for the 2019 Australian National Gravity Grids B series. This gravity survey was acquired under the project No. 202008. The grid has a cell size of 0.00417 degrees (approximately 435m). The data are given in units of um/s^2, also known as 'gravity units', or gu.Australiagravitygridgeophys__Gravmap2019-grid-grv_cscba-IncludesAirborneRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666667 -48.00208337360861164.00208333333336 -7.997916667278789National Gravity Compilation 2019 includes airborne (free air grid)Australiagravitygridgeophys__Gravmap2019-grid-grv_fa-IncludesAirborneRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666667 -48.00208337360861164.00208333333336 -7.997916667278789National Gravity Compilation 2019 includes airborne - CSCBA 0.5VD gridAustraliagravitygridgeophys__Gravmap2019-grid-grv_cscba_05vd-IncludesAirborneRectifiedGridCoverage107.99791666633806 -48.002083333365334164.00208333304954 -7.997916666666667107.99791666633806 -48.00208337364061164.00208333304954 -7.997916667278788National Gravity Compilation 2019 includes airborne DGIR 0.5VD gridGravity 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 includes airborne DGIR 0.5VD grid is produced from the 2019 Australian National Gravity Grids B series. These gravity data were acquired under the project No. 202008. The grid has a cell size of 0.00417 degrees (approximately 435m). The data are derived from ground observations stored in the Australian National Gravity Database (ANGD) as at September 2019, supplemented by 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. Airborne gravity and gravity gradiometry data were also included to provide better resolution to areas where ground gravity data was not of a suitable quality. Out of the approximately 1.8 million gravity observations, nearly 1.4 million gravity stations in the ANGD together with Airborne Gravity surveys totaling 345,000 line km and 106,000 line km of Airborne Gravity Gradiometry were used to generate this grid. The ground and airborne 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 for ground observations 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. Airborne surveys have a line spacing ranging from 0.5 km to 2.5 km. The grid shows the half vertical derivative of the de-trended global isostatic residual (DGIR) anomalies over Australia and its continental margins. The DGIR grid was obtained by subtracting 3 quantities (i.e., the near-field isostatic correction, the far-field isostatic correction, and a first order trend correction) from Complete Bouguer Anomaly data (CBA) of the 2019 Australian National Gravity Grids B series. A half vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the DGIR grid of the 2019 Australian National Gravity Grids to produce this grid.Australiagravitygridgeophys__Gravmap2019-grid-grv_dtgir_05vd-IncludesAirborneRectifiedGridCoverage107.99791666633806 -48.002083333365334164.00208333304954 -7.997916666666667107.99791666633806 -48.00208337364061164.00208333304954 -7.997916667278788National Gravity Compilation 2019 includes airborne DGIR 1VD gridGravity 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 includes airborne DGIR 1VD grid is produced from the 2019 Australian National Gravity Grids B series. These gravity data were acquired under the project No. 202008. The grid has a cell size of 0.00417 degrees (approximately 435m). The data are derived from ground observations stored in the Australian National Gravity Database (ANGD) as at September 2019, supplemented by 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. Airborne gravity and gravity gradiometry data were also included to provide better resolution to areas where ground gravity data was not of a suitable quality. Out of the approximately 1.8 million gravity observations, nearly 1.4 million gravity stations in the ANGD together with Airborne Gravity surveys totaling 345,000 line km and 106,000 line km of Airborne Gravity Gradiometry were used to generate this grid. The ground and airborne 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 for ground observations 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. Airborne surveys have a line spacing ranging from 0.5 km to 2.5 km. The grid shows the first vertical derivative of the de-trended global isostatic residual (DGIR) anomalies over Australia and its continental margins. The DGIR grid was obtained by subtracting 3 quantities (i.e., the near-field isostatic correction, the far-field isostatic correction, and a first order trend correction) from Complete Bouguer Anomaly data (CBA) of the 2019 Australian National Gravity Grids B series. A first vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the DGIR grid of the 2019 Australian National Gravity Grids to produce this grid.Australiagravitygridgeophys__Gravmap2019-grid-grv_dtgir_1vd-IncludesAirborneRectifiedGridCoverage107.99791666633806 -48.002083333365334164.00208333304954 -7.997916666666667107.99791666633806 -48.00208337364061164.00208333304954 -7.997916667278788National Gravity Compilation 2019 includes airborne DGIR gridAustraliagravitygridgeophys__Gravmap2019-grid-grv_dtgir-IncludesAirborneRectifiedGridCoverage107.99791666666667 -48.00208333333333164.00208333333333 -7.997916666666669107.99791666666667 -48.00208337360861164.00208333333336 -7.997916667278789National Gravity Compilation 2019 includes airborne DGIR tilt gridGravity 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 includes airborne DGIR tilt grid is produced from the 2019 Australian National Gravity Grids B series. These gravity data were acquired under the project No. 202008. The grid has a cell size of 0.00417 degrees (approximately 435m). The data are derived from ground observations stored in the Australian National Gravity Database (ANGD) as at September 2019, supplemented by 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. Airborne gravity and gravity gradiometry data were also included to provide better resolution to areas where ground gravity data was not of a suitable quality. Out of the approximately 1.8 million gravity observations, nearly 1.4 million gravity stations in the ANGD together with Airborne Gravity surveys totaling 345,000 line km and 106,000 line km of Airborne Gravity Gradiometry were used to generate this grid. The ground and airborne 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 for ground observations 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. Airborne surveys have a line spacing ranging from 0.5 km to 2.5 km. The grid shows a tilt of the de-trended global isostatic residual (DGIR) anomalies over Australia and its continental margins. The DGIR grid was obtained by subtracting 3 quantities (i.e., the near-field isostatic correction, the far-field isostatic correction, and a first order trend correction) from Complete Bouguer Anomaly data (CBA) of the 2019 Australian National Gravity Grids B series. A tilt filter was calculated by applying a fast Fourier transform (FFT) process to the DGIR grid of the 2019 Australian National Gravity Grids B series to produce this grid. A tilt filter is a ratio of the vertical derivative to the total horizontal derivative and is used for detection of edges of geological units.Australiagravitygridgeophys__Gravmap2019-grid-grv_dtgir_tilt-IncludesAirborneRectifiedGridCoverage107.99791666666667 -48.002083333365334164.00208333337815 -7.997916666666667107.99791666666667 -48.00208337364061164.00208333337815 -7.997916667278788National Gravity Compilation 2019 includes airborne tilt gridAustraliagravitygridgeophys__Gravmap2019-grid-grv_cscba_tilt-IncludesAirborneRectifiedGridCoverage107.99791666666667 -48.002083333365334164.00208333337815 -7.997916666666667107.99791666666667 -48.00208337364061164.00208333337815 -7.997916667278788National Gravity Compilation 2019 tilt gridGravity 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.Australiagravitygridgeophys__Gravmap2019-grid-grv_cscba_tiltRectifiedGridCoverage107.99791666666667 -48.002083333365334164.00208333337815 -7.997916666666667107.99791666666667 -48.00208337364061164.00208333337815 -7.997916667278788Radiometric Ternary Image of Australia 2019The national ternary radiometric image (2019 edition) shows the concentrations of the radioelements potassium (K), uranium (U) and thorium (Th) at the Earth's surface as measured using the airborne gamma-ray spectrometric method. The image is a false colour composite using the colours red, blue and green to represent potassium, uranium and thorium respectively. White areas have high concentrations of all the radioelements and dark areas have low concentrations. Areas high in K only appear red, and areas high in U and Th but low in K appear turquoise (a mixture of blue and green).potassiumuraniumAustraliaradiometricsthoriumimageternarygeophysicsgeophys__radmap_v4_2019_filtered_ternary_imageRectifiedGridCoverage112.89949999999999 -43.76050000000001153.6705 -8.9995112.89949999999999 -43.76050004081041153.6705 -8.999500000938234Radiometrics Filtered Dose Image - 2015Terrestrial dose rate derived as a linear combination of the filtered K, U and Th grids described above (see Minty et al., 2009). Unit of measure = nG/h. The Radiometric Map of Australia dataset comprises gridsof potassium (K), uranium (U) and thorium (Th) element concentrations, and derivatives of these grids. This third edition was derived by seamlessly merging 45 new survey grids with the Second Edition Radiometric Map of Australia (Minty et al., 2010). Details of the specifications of individual airborne surveys can be found in the 2014 Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). Matching of the grids in the database was achieved using a program called Gridmerge, originally developed within Geoscience Australia and has now been commercialised. This program was used to merge 45 new surveys to the Second Edition Radiometric Map of Australia. The second edition merged over 550 individual grids to create the compilation (Minty et al., 2009), and the Australia-wide Airborne Geophysical Survey (AWAGS) airborne radiometric data was used to control the base levels of those survey grids which overlapped the AWAGS data (Milligan et al., 2009). As the second edition was used as a base grid for the Gridmerge operation the new Third Edition is essentially levelled to AWAGS. Filtering: Potassium, uranium, thorium and dose rate grids are available in both filtered and unfiltered versions. The low-pass filtering was achieved by applying a 7-point, degree-3 Savitzky-Golay filter (Savitzky and Golay, 1964) to each of the original survey grids prior to grid merging.radiometricsgeophysicsgeophysical surveyairborne digital datagridAustraliageophys__radmap_v3_2015_filtered_dose_xRectifiedGridCoverage112.7165 -43.7605153.6705 -8.9995112.7165 -43.7605153.6705 -8.9995Radiometrics Filtered K percent Image - 2015Low-pass filtered K element concentration (percent K). The Radiometric Map of Australia dataset comprises gridsof potassium (K), uranium (U) and thorium (Th) element concentrations, and derivatives of these grids. This third edition was derived by seamlessly merging 45 new survey grids with the Second Edition Radiometric Map of Australia (Minty et al., 2010). Details of the specifications of individual airborne surveys can be found in the 2014 Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). Matching of the grids in the database was achieved using a program called Gridmerge, originally developed within Geoscience Australia and has now been commercialised. This program was used to merge 45 new surveys to the Second Edition Radiometric Map of Australia. The second edition merged over 550 individual grids to create the compilation (Minty et al., 2009), and the Australia-wide Airborne Geophysical Survey (AWAGS) airborne radiometric data was used to control the base levels of those survey grids which overlapped the AWAGS data (Milligan et al., 2009). As the second edition was used as a base grid for the Gridmerge operation the new Third Edition is essentially levelled to AWAGS. Filtering: Potassium, uranium, thorium and dose rate grids are available in both filtered and unfiltered versions. The low-pass filtering was achieved by applying a 7-point, degree-3 Savitzky-Golay filter (Savitzky and Golay, 1964) to each of the original survey grids prior to grid merging.radiometricsgeophysicsgeophysical surveyairborne digital datagridAustraliageophys__radmap_v3_2015_filtered_pctk_xRectifiedGridCoverage112.7165 -43.7605153.6705 -8.9995112.7165 -43.7605153.6705 -8.9995Radiometrics Filtered Th ppm Image - 2015Low-pass filtered Th element concentration (ppm eTh). The Radiometric Map of Australia dataset comprises gridsof potassium (K), uranium (U) and thorium (Th) element concentrations, and derivatives of these grids. This third edition was derived by seamlessly merging 45 new survey grids with the Second Edition Radiometric Map of Australia (Minty et al., 2010). Details of the specifications of individual airborne surveys can be found in the 2014 Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). Matching of the grids in the database was achieved using a program called Gridmerge, originally developed within Geoscience Australia and has now been commercialised. This program was used to merge 45 new surveys to the Second Edition Radiometric Map of Australia. The second edition merged over 550 individual grids to create the compilation (Minty et al., 2009), and the Australia-wide Airborne Geophysical Survey (AWAGS) airborne radiometric data was used to control the base levels of those survey grids which overlapped the AWAGS data (Milligan et al., 2009). As the second edition was used as a base grid for the Gridmerge operation the new Third Edition is essentially levelled to AWAGS. Filtering: Potassium, uranium, thorium and dose rate grids are available in both filtered and unfiltered versions. The low-pass filtering was achieved by applying a 7-point, degree-3 Savitzky-Golay filter (Savitzky and Golay, 1964) to each of the original survey grids prior to grid merging.radiometricsgeophysicsgeophysical surveyairborne digital datagridAustraliageophys__radmap_v3_2015_filtered_ppmth_xRectifiedGridCoverage112.7165 -43.7605153.6705 -8.9995112.7165 -43.7605153.6705 -8.9995Radiometrics Filtered U ppm Image - 2015Low-pass filtered U element concentration (ppm eU). The Radiometric Map of Australia dataset comprises gridsof potassium (K), uranium (U) and thorium (Th) element concentrations, and derivatives of these grids. This third edition was derived by seamlessly merging 45 new survey grids with the Second Edition Radiometric Map of Australia (Minty et al., 2010). Details of the specifications of individual airborne surveys can be found in the 2014 Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). Matching of the grids in the database was achieved using a program called Gridmerge, originally developed within Geoscience Australia and has now been commercialised. This program was used to merge 45 new surveys to the Second Edition Radiometric Map of Australia. The second edition merged over 550 individual grids to create the compilation (Minty et al., 2009), and the Australia-wide Airborne Geophysical Survey (AWAGS) airborne radiometric data was used to control the base levels of those survey grids which overlapped the AWAGS data (Milligan et al., 2009). As the second edition was used as a base grid for the Gridmerge operation the new Third Edition is essentially levelled to AWAGS. Filtering: Potassium, uranium, thorium and dose rate grids are available in both filtered and unfiltered versions. The low-pass filtering was achieved by applying a 7-point, degree-3 Savitzky-Golay filter (Savitzky and Golay, 1964) to each of the original survey grids prior to grid merging.radiometricsgeophysicsgeophysical surveyairborne digital datagridAustraliageophys__radmap_v3_2015_filtered_ppmu_xRectifiedGridCoverage112.7165 -43.7605153.6705 -8.9995112.7165 -43.7605153.6705 -8.9995Radiometrics Th/K Ratio Image - 2015Ratio of Th over K derived from the filtered Th and K grids. The Radiometric Map of Australia dataset comprises gridsof potassium (K), uranium (U) and thorium (Th) element concentrations, and derivatives of these grids. This third edition was derived by seamlessly merging 45 new survey grids with the Second Edition Radiometric Map of Australia (Minty et al., 2010). Details of the specifications of individual airborne surveys can be found in the 2014 Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). Matching of the grids in the database was achieved using a program called Gridmerge, originally developed within Geoscience Australia and has now been commercialised. This program was used to merge 45 new surveys to the Second Edition Radiometric Map of Australia. The second edition merged over 550 individual grids to create the compilation (Minty et al., 2009), and the Australia-wide Airborne Geophysical Survey (AWAGS) airborne radiometric data was used to control the base levels of those survey grids which overlapped the AWAGS data (Milligan et al., 2009). As the second edition was used as a base grid for the Gridmerge operation the new Third Edition is essentially levelled to AWAGS. Filtering: Potassium, uranium, thorium and dose rate grids are available in both filtered and unfiltered versions. The low-pass filtering was achieved by applying a 7-point, degree-3 Savitzky-Golay filter (Savitzky and Golay, 1964) to each of the original survey grids prior to grid merging.radiometricsgeophysicsgeophysical surveyairborne digital datagridAustraliageophys__radmap_v3_2015_ratio_tk_xRectifiedGridCoverage112.7165 -43.7605153.6705 -8.9995112.7165 -43.7605153.6705 -8.9995Radiometrics U/K Ratio Image - 2015Ratio of U over K derived from the filtered U and K grids. The Radiometric Map of Australia dataset comprises grids of potassium (K), uranium (U) and thorium (Th) element concentrations, and derivatives of these grids. This third edition was derived by seamlessly merging 45 new survey grids with the Second Edition Radiometric Map of Australia (Minty et al., 2010). Details of the specifications of individual airborne surveys can be found in the 2014 Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). Matching of the grids in the database was achieved using a program called Gridmerge, originally developed within Geoscience Australia and has now been commercialised. This program was used to merge 45 new surveys to the Second Edition Radiometric Map of Australia. The second edition merged over 550 individual grids to create the compilation (Minty et al., 2009), and the Australia-wide Airborne Geophysical Survey (AWAGS) airborne radiometric data was used to control the base levels of those survey grids which overlapped the AWAGS data (Milligan et al., 2009). As the second edition was used as a base grid for the Gridmerge operation the new Third Edition is essentially levelled to AWAGS. Filtering: Potassium, uranium, thorium and dose rate grids are available in both filtered and unfiltered versions. The low-pass filtering was achieved by applying a 7-point, degree-3 Savitzky-Golay filter (Savitzky and Golay, 1964) to each of the original survey grids prior to grid merging.radiometricsgeophysicsgeophysical surveyairborne digital datagridAustraliageophys__radmap_v3_2015_ratio_uk_xRectifiedGridCoverage112.7165 -43.7605153.6705 -8.9995112.7165 -43.7605153.6705 -8.9995Radiometrics U/Th Ratio Image - 2015Ratio of U over Th derived from the filtered U and Th grids. The Radiometric Map of Australia dataset comprises grids of potassium (K), uranium (U) and thorium (Th) element concentrations, and derivatives of these grids. This third edition was derived by seamlessly merging 45 new survey grids with the Second Edition Radiometric Map of Australia (Minty et al., 2010). Details of the specifications of individual airborne surveys can be found in the 2014 Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). Matching of the grids in the database was achieved using a program called Gridmerge, originally developed within Geoscience Australia and has now been commercialised. This program was used to merge 45 new surveys to the Second Edition Radiometric Map of Australia. The second edition merged over 550 individual grids to create the compilation (Minty et al., 2009), and the Australia-wide Airborne Geophysical Survey (AWAGS) airborne radiometric data was used to control the base levels of those survey grids which overlapped the AWAGS data (Milligan et al., 2009). As the second edition was used as a base grid for the Gridmerge operation the new Third Edition is essentially levelled to AWAGS. Filtering: Potassium, uranium, thorium and dose rate grids are available in both filtered and unfiltered versions. The low-pass filtering was achieved by applying a 7-point, degree-3 Savitzky-Golay filter (Savitzky and Golay, 1964) to each of the original survey grids prior to grid merging.radiometricsgeophysicsgeophysical surveyairborne digital datagridAustraliageophys__radmap_v3_2015_ratio_ut_xRectifiedGridCoverage112.7165 -43.7605153.6705 -8.9995112.7165 -43.7605153.6705 -8.9995Radiometrics U2/Th Ratio Image - 2015Ratio of U-squared over Th derived from the filtered U and Th grids. The Radiometric Map of Australia dataset comprises grids of potassium (K), uranium (U) and thorium (Th) element concentrations, and derivatives of these grids. This third edition was derived by seamlessly merging 45 new survey grids with the Second Edition Radiometric Map of Australia (Minty et al., 2010). Details of the specifications of individual airborne surveys can be found in the 2014 Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). Matching of the grids in the database was achieved using a program called Gridmerge, originally developed within Geoscience Australia and has now been commercialised. This program was used to merge 45 new surveys to the Second Edition Radiometric Map of Australia. The second edition merged over 550 individual grids to create the compilation (Minty et al., 2009), and the Australia-wide Airborne Geophysical Survey (AWAGS) airborne radiometric data was used to control the base levels of those survey grids which overlapped the AWAGS data (Milligan et al., 2009). As the second edition was used as a base grid for the Gridmerge operation the new Third Edition is essentially levelled to AWAGS. Filtering: Potassium, uranium, thorium and dose rate grids are available in both filtered and unfiltered versions. The low-pass filtering was achieved by applying a 7-point, degree-3 Savitzky-Golay filter (Savitzky and Golay, 1964) to each of the original survey grids prior to grid merging.radiometricsgeophysicsgeophysical surveyairborne digital datagridAustraliageophys__radmap_v3_2015_ratio_u2txRectifiedGridCoverage112.7165 -43.7605153.6705 -8.9995112.7165 -43.7605153.6705 -8.9995Radiometrics Unfiltered Dose Image - 2015Unfiltered terrestrial dose rate derived as a linear combination of the unfiltered K, U and Th grids (Minty et al., 2009). Unit of measure: nG/h. The Radiometric Map of Australia dataset comprises gridsof potassium (K), uranium (U) and thorium (Th) element concentrations, and derivatives of these grids. This third edition was derived by seamlessly merging 45 new survey grids with the Second Edition Radiometric Map of Australia (Minty et al., 2010). Details of the specifications of individual airborne surveys can be found in the 2014 Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). Matching of the grids in the database was achieved using a program called Gridmerge, originally developed within Geoscience Australia and has now been commercialised. This program was used to merge 45 new surveys to the Second Edition Radiometric Map of Australia. The second edition merged over 550 individual grids to create the compilation (Minty et al., 2009), and the Australia-wide Airborne Geophysical Survey (AWAGS) airborne radiometric data was used to control the base levels of those survey grids which overlapped the AWAGS data (Milligan et al., 2009). As the second edition was used as a base grid for the Gridmerge operation the new Third Edition is essentially levelled to AWAGS. Filtering: Potassium, uranium, thorium and dose rate grids are available in both filtered and unfiltered versions. The low-pass filtering was achieved by applying a 7-point, degree-3 Savitzky-Golay filter (Savitzky and Golay, 1964) to each of the original survey grids prior to grid merging.radiometricsgeophysicsgeophysical surveyairborne digital datagridAustraliageophys__radmap_v3_2015_unfiltered_doseRectifiedGridCoverage112.7165 -43.7605153.6705 -8.9995112.7165 -43.7605153.6705 -8.9995Radiometrics Unfiltered K percent Image - 2015Unfiltered Potassium element concentrations (percent K). The Radiometric Map of Australia dataset comprises gridsof potassium (K), uranium (U) and thorium (Th) element concentrations, and derivatives of these grids. This third edition was derived by seamlessly merging 45 new survey grids with the Second Edition Radiometric Map of Australia (Minty et al., 2010). Details of the specifications of individual airborne surveys can be found in the 2014 Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). Matching of the grids in the database was achieved using a program called Gridmerge, originally developed within Geoscience Australia and has now been commercialised. This program was used to merge 45 new surveys to the Second Edition Radiometric Map of Australia. The second edition merged over 550 individual grids to create the compilation (Minty et al., 2009), and the Australia-wide Airborne Geophysical Survey (AWAGS) airborne radiometric data was used to control the base levels of those survey grids which overlapped the AWAGS data (Milligan et al., 2009). As the second edition was used as a base grid for the Gridmerge operation the new Third Edition is essentially levelled to AWAGS. Filtering: Potassium, uranium, thorium and dose rate grids are available in both filtered and unfiltered versions. The low-pass filtering was achieved by applying a 7-point, degree-3 Savitzky-Golay filter (Savitzky and Golay, 1964) to each of the original survey grids prior to grid merging.radiometricsgeophysicsgeophysical surveyairborne digital datagridAustraliageophys__radmap_v3_2015_unfiltered_pctkRectifiedGridCoverage112.7165 -43.7605153.6705 -8.9995112.7165 -43.7605153.6705 -8.9995Radiometrics Unfiltered Th ppm Image - 2015Unfiltered Thorium element concentrations (ppm eTh). The Radiometric Map of Australia dataset comprises gridsof potassium (K), uranium (U) and thorium (Th) element concentrations, and derivatives of these grids. This third edition was derived by seamlessly merging 45 new survey grids with the Second Edition Radiometric Map of Australia (Minty et al., 2010). Details of the specifications of individual airborne surveys can be found in the 2014 Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). Matching of the grids in the database was achieved using a program called Gridmerge, originally developed within Geoscience Australia and has now been commercialised. This program was used to merge 45 new surveys to the Second Edition Radiometric Map of Australia. The second edition merged over 550 individual grids to create the compilation (Minty et al., 2009), and the Australia-wide Airborne Geophysical Survey (AWAGS) airborne radiometric data was used to control the base levels of those survey grids which overlapped the AWAGS data (Milligan et al., 2009). As the second edition was used as a base grid for the Gridmerge operation the new Third Edition is essentially levelled to AWAGS. Filtering: Potassium, uranium, thorium and dose rate grids are available in both filtered and unfiltered versions. The low-pass filtering was achieved by applying a 7-point, degree-3 Savitzky-Golay filter (Savitzky and Golay, 1964) to each of the original survey grids prior to grid merging.radiometricsgeophysicsgeophysical surveyairborne digital datagridAustraliageophys__radmap_v3_2015_unfiltered_ppmthRectifiedGridCoverage112.7165 -43.7605153.6705 -8.9995112.7165 -43.7605153.6705 -8.9995Radiometrics Unfiltered U ppm Image - 2015Unfiltered uranium element concentrations (ppm eU). The Radiometric Map of Australia dataset comprises gridsof potassium (K), uranium (U) and thorium (Th) element concentrations, and derivatives of these grids. This third edition was derived by seamlessly merging 45 new survey grids with the Second Edition Radiometric Map of Australia (Minty et al., 2010). Details of the specifications of individual airborne surveys can be found in the 2014 Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). Matching of the grids in the database was achieved using a program called Gridmerge, originally developed within Geoscience Australia and has now been commercialised. This program was used to merge 45 new surveys to the Second Edition Radiometric Map of Australia. The second edition merged over 550 individual grids to create the compilation (Minty et al., 2009), and the Australia-wide Airborne Geophysical Survey (AWAGS) airborne radiometric data was used to control the base levels of those survey grids which overlapped the AWAGS data (Milligan et al., 2009). As the second edition was used as a base grid for the Gridmerge operation the new Third Edition is essentially levelled to AWAGS. Filtering: Potassium, uranium, thorium and dose rate grids are available in both filtered and unfiltered versions. The low-pass filtering was achieved by applying a 7-point, degree-3 Savitzky-Golay filter (Savitzky and Golay, 1964) to each of the original survey grids prior to grid merging.radiometricsgeophysicsgeophysical surveyairborne digital datagridAustraliageophys__radmap_v3_2015_unfiltered_ppmuRectifiedGridCoverage112.7165 -43.7605153.6705 -8.9995112.7165 -43.7605153.6705 -8.9995Ratio Th/K Grid of Australia 2019The thorium over potassium grid is a derivative of the 2019 radiometric or gamma-ray grid of Australia. The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data are collected on airborne geophysical surveys conducted by Commonwealth, State and Northern Territory Governments and the private sector. The 2019 thorium over potassium was derived by seamlessly merging over 600 airborne gamma-ray spectrometric surveys. The final grid has a cell size of about 100m (0.001 degrees) and is derived from the filtered thorium and potassium grids.AustraliaNational Geophysical CompilationRadiometricsGridEarth SciencesNCIgeophys__radmap_v4_2019_ratio_tkRectifiedGridCoverage112.8995 -43.7605153.6705 -8.9995112.8995 -43.760500040810406153.6705 -8.999500000938232Ratio U/K grid of Australia 2019The uranium over potassium grid is a derivative of the 2019 radiometric or gamma-ray grid of Australia comprising over 600 airborne gamma-ray spectrometric surveys. The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data are collected on airborne geophysical surveys conducted by Commonwealth, State and Northern Territory Governments and the private sector. The 2019 uranium over potassium grid has a cell size of about 100 m (0.001 degrees) and is derived from the filtered uranium and potassium grids.Airborne Digital DataPotassiumAustraliaNational Geophysical CompilationRadiometricsGeophysicsGridEarth SciencesNCIgeophys__radmap_v4_2019_ratio_ukRectifiedGridCoverage112.8995 -43.7605153.6705 -8.9995112.8995 -43.760500040810406153.6705 -8.999500000938232Ratio U/Th grid of Australia 2019The uranium over thorium grid is a derivative of the 2019 radiometric or gamma-ray grid of Australia which is a merge of over 600 individual gamma-ray spectrometric surveys. The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data are collected on airborne geophysical surveys conducted by Commonwealth, State and Northern Territory Governments and the private sector. The 2019 uranium over thorium grid has a cell size of about 100 m (0.001 degrees) and is derived from the filtered uranium and thorium grids.Airborne Digital DataAustraliaNational Geophysical CompilationRadiometricsGeophysicsEarth SciencesNCIgeophys__radmap_v4_2019_ratio_utRectifiedGridCoverage112.8995 -43.7605153.6705 -8.9995112.8995 -43.760500040810406153.6705 -8.999500000938232Ratio U2/Th grid of Australia 2019The uranium squared over thorium grid is a derivative of the 2019 radiometric or gamma-ray grid of Australia. The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data are collected on airborne geophysical surveys conducted by Commonwealth, State and Northern Territory Governments and the private sector. The 2019 uranium squared over thorium was derived by seamlessly merging over 600 airborne gamma-ray spectrometric surveys. The final grid has a cell size of about 100m (0.001 degrees) and is derived from the filtered uranium and thorium grids.Airborne Digital DataAustraliaNational Geophysical CompilationGeophysicsGridEarth SciencesNCIgeophys__radmap_v4_2019_ratio_u2tRectifiedGridCoverage112.8995 -43.7605153.6705 -8.9995112.8995 -43.760500040810406153.6705 -8.999500000938232Total Magnetic Intensity - Variable Reduction to Pole (VRTP) greyscale image - 2015The file is an image created from magmap_v6_2015_VRTP, a Variable Reduction to Pole TMI grid of the Australian region with a grid cell spacing of ~3 seconds of arc (approximately 80 m). This image only includes airborne-derived TMI data for onshore and near-offshore continental areas. The VRTP processing followed Cooper and Cowan's (2005) differential reduction to pole up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-11 geomagnetic reference model (Finlay et al., 2010) using a data representative date of January 2005 and elevation 300 m.magneticstotal magnetic intensityimageHSIgeophysicsAustraliageophys__magmap_V6_2015_VRTP1RectifiedGridCoverage112.504198776 -43.9289808725154.663348579 -9.0273281665112.504198776 -43.9289808725154.663348579 -9.0273281665Total Magnetic Intensity Grid of Australia 2019 - First vertical derivative (1VD) - seventh editionTotal magnetic intensity (TMI) data measures variations in the intensity of the Earth magnetic field caused by the contrasting content of rock-forming minerals in the Earth crust. Magnetic anomalies can be either positive (field stronger than normal) or negative (field weaker) depending on the susceptibility of the rock. The first vertical derivative (1VD) grid is derived from the 2019 Total magnetic Intensity (TMI) grid of Australia which has a grid cell size of ~3 seconds of arc (approximately 80 m). As the vertical derivative filter is essentially a high-pass filter, longer wavelengths are suppressed, and shorter wavelengths emphasized. The magnetic units of the data are in nT per metre.Airborne Digital DataNCIAustraliaNational Geophysical CompilationGeophysicsMageneticsGridEarth SciencesVertical Derivativegeophys__magmap_v7_2019_1VDRectifiedGridCoverage95.4695738045586 -47.77337129965278162.65938610455862 -7.907465999652778595.46957380455862 -47.77337134002572162.65938610455862 -7.90746600023924Total Magnetic Intensity Grid of Australia 2019 - seventh edition - 40 mTotal magnetic intensity (TMI) data measures variations in the intensity of the Earth magnetic field caused by the contrasting content of rock-forming minerals in the Earth crust. Magnetic anomalies can be either positive (field stronger than normal) or negative (field weaker) depending on the susceptibility of the rock. This grid only includes airborne-derived TMI data for onshore and near-offshore continental areas. The grid has a cell size of approximately 40 m. This spatial resolution will enable 200 m line spacing surveys incorporated into the grid to be viewed at their optimum grid resolution. Since the sixth edition was released in 2015, data from 234 new surveys have been added to the database, acquired mainly by the State and Territory Geological Surveys. The new grid was derived from a re-levelling of the national magnetic grid database. The survey grids were levelled to each other, and to the Australia Wide Airborne Geophysical Survey (AWAGS), which serves as a baseline to constrain long wavelengths in the final grid. It is estimated that 33 500 000 line-kilometres of survey data were acquired to produce the 2019 grid, about 2 000 000 line-kilometres more than for the previous edition.TMIAustraliaNational Geophysical CompilationMagneticsGeophysicsAirborne Digital dataGridEarth SciencesNCIgeophys__magmap_v7_2019_TMI_40mRectifiedGridCoverage105.99979175 -43.93023665154.66323525 -9.02670365105.99979175 -43.93023669084127154.66323525 -9.026703650948198Total Magnetic Intensity Grid of Australia 2019 - seventh edition - 80 mTotal magnetic intensity (TMI) data measures variations in the intensity of the Earth magnetic field caused by the contrasting content of rock-forming minerals in the Earth crust. Magnetic anomalies can be either positive (field stronger than normal) or negative (field weaker) depending on the susceptibility of the rock. The 2019 Total magnetic Intensity (TMI) grid of Australia has a grid cell size of ~3 seconds of arc (approximately 80 m). This grid only includes airborne-derived TMI data for onshore and near-offshore continental areas. Since the sixth edition was released in 2015, data from 234 new surveys have been added to the database, acquired mainly by the State and Territory Geological Surveys. The new grid was derived from a re-levelling of the national magnetic grid database. The survey grids were levelled to each other, and to the Australia Wide Airborne Geophysical Survey (AWAGS), which serves as a baseline to constrain long wavelengths in the final grid. It is estimated that 33 500 000 line-kilometres of survey data were acquired to produce the 2019 grid data, about 2 000 000 line-kilometres more than for the previous edition.Airborne Digital Dataearth SciencesTMIAustraliaMagneticsgridgeophysicsNCIgeophys__magmap_v7_2019_TMIRectifiedGridCoverage105.99958335 -43.930099049999995154.66347005 -9.02649525105.99958335 -43.930099090841246154.66347005 -9.026495250948122Total Magnetic Intensity Grid of Australia with Variable Reduction to Pole (VRTP) 2019 - seventh editionTotal magnetic intensity (TMI) data measures variations in the intensity of the Earth magnetic field caused by the contrasting content of rock-forming minerals in the Earth crust. Magnetic anomalies can be either positive (field stronger than normal) or negative (field weaker) depending on the susceptibility of the rock. A variable reduction to Pole is aimed at locating magnetic anomalies exactly above their source bodies and without any distortion. The 2019 Total magnetic Intensity (TMI) grid of Australia with variable reduction to pole (VRTP) has a grid cell size of ~3 seconds of arc (approximately 80 m). This grid only includes airborne-derived TMI data for onshore and near-offshore continental areas. The VRTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-11 geomagnetic reference model using a data representative date of January 2005 and elevation 300 m.AustraliaNational Geophysical CompilationMagneticsReduction To PoleRTPGeophysicsEarth SciencesNCIgeophys__magmap_v7_2019_RTPRectifiedGridCoverage95.4695738045586 -47.77337129965278162.65938610455862 -7.907465999652778595.46957380455862 -47.77337134002572162.65938610455862 -7.90746600023924Total Magnetic Intensity HSI Image - 2019Total magnetic intensity (TMI) data measures variations in the intensity of the Earth's magnetic field caused by the contrasting content of rock-forming minerals in the Earth crust. Magnetic anomalies can be either positive (field stronger than normal) or negative (field weaker) depending on the susceptibility of the rock. The data 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 image is a combined Hue, Saturation, Intensity (HSI) color image of the TMI grid of the Australian region (Magmap 2019), with a grid cell size of 0.0008333 degrees (approximately 80m). This image only includes airborne-derived TMI data for onshore and near-offshore continental areas. The image shows the magnetic response of subsurface features with contrasting magnetic susceptibilities. The image can also be used to locate structural features such as dykes.Airborne Digital DataImageAustraliaHSIRadiometricsgeophys__tmi_hsi_v2_whiteRectifiedGridCoverage105.99958335 -43.92944658300001154.66346335 -9.026495250000004105.99958335000001 -43.92944662384115154.66346335 -9.026495250948125Total Magnetic Intensity HSI colour image - 2015The Total Magnetic Intensity (HSI colour) image is created from the magmap_v6_2015 which is a composite TMI grid of the Australian region with a grid cell spacing of ~3 seconds of arc (approximately 80 m). This image only includes airborne-derived TMI data for onshore and near-offshore continental areas. Since the fifth edition was released in 2010 data from 41 new surveys have been added to the database, acquired mainly by the State and Territory Geological Surveys. It is estimated that 31 500 000 line-kilometres of survey data were acquired to produce the grid data, 4 500 000 line-kilometres more than for the previous edition. Details of the specifications of individual airborne surveys can be found in the Fourteenth Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). Matching of the grids in the database was achieved using a program called Gridmerge, which was originally developed within Geoscience Australia and has now been commercialised. This program was used to merge 41 new surveys to the 5th Edition Total Magnetic Intensity Anomaly Grid of Australia (Milligan et al., 2010). The 5th Edition merged 795 individual grids to create the compilation and to constrain long wavelengths, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of those survey grids which overlapped the AWAGS data (Milligan et al., 2009). As the 5th Edition was used as a base grid for the Gridmerge operation the new 6th Edition is essentially levelled to AWAGS. Individual and merged grids may be downloaded from the Geophysical Archive Data Delivery System (GADDS) on the Australian Government's Geoscience Portal at http://www.geoscience.gov.au/gadds. References: Milligan, P.R., Minty, B.R.S., Richardson, M. and Franklin, R., 2009. The Australia-wide Airborne Geophysical Survey - accurate continental magnetic coverage. Preview, 138, 70. Milligan, P.R., Franklin, R., Minty, B.R.S., Richardson, L.M. and Percival, P.J., 2010. Magnetic Anomaly Map of Australia (Fifth Edition), 1:5 000 000 scale, Geoscience Australia, Canberra. Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition). Geoscience Australia Record 2014/014.magneticstotal magnetic intensityimageHSIgeophysicsAustraliageophys__magmap_v6_2015_tmi_HSIRectifiedGridCoverage112.5033654425 -43.9298142055154.6633485785 -9.026494833500001112.5033654425 -43.9298142055154.6633485785 -9.026494833500001Total Magnetic Intensity greyscale image - 2015The Total Magnetic Intensity (greyscale) image is created from a composite TMI grid of the Australian region with a grid cell spacing of ~3 seconds of arc (approximately 80 m). This image only includes airborne-derived TMI data for onshore and near-offshore continental areas. Since the fifth edition was released in 2010 data from 41 new surveys have been added to the database, acquired mainly by the State and Territory Geological Surveys. It is estimated that 31 500 000 line-kilometres of survey data were acquired to produce the grid data, 4 500 000 line-kilometres more than for the previous edition. Details of the specifications of individual airborne surveys can be found in the Fourteenth Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). Matching of the grids in the database was achieved using a program called Gridmerge, which was originally developed within Geoscience Australia and has now been commercialised. This program was used to merge 41 new surveys to the 5th Edition Total Magnetic Intensity Anomaly Grid of Australia (Milligan et al., 2010). The 5th Edition merged 795 individual grids to create the compilation and to constrain long wavelengths, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of those survey grids which overlapped the AWAGS data (Milligan et al., 2009). As the 5th Edition was used as a base grid for the Gridmerge operation the new 6th Edition is essentially levelled to AWAGS. Individual and merged grids may be downloaded from the Geophysical Archive Data Delivery System (GADDS) on the Australian Government's Geoscience Portal at http://www.geoscience.gov.au/gadds. References: Milligan, P.R., Minty, B.R.S., Richardson, M. and Franklin, R., 2009. The Australia-wide Airborne Geophysical Survey - accurate continental magnetic coverage. Preview, 138, 70. Milligan, P.R., Franklin, R., Minty, B.R.S., Richardson, L.M. and Percival, P.J., 2010. Magnetic Anomaly Map of Australia (Fifth Edition), 1:5 000 000 scale, Geoscience Australia, Canberra. Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition). Geoscience Australia Record 2014/014.magneticstotal magnetic intensityimagegeophysicsAustraliageophys__magmap_V6_2015RectifiedGridCoverage112.50336544250003 -43.92981420550001154.66334857850003 -9.026494833500003112.50336544250003 -43.92981420550001154.66334857850003 -9.026494833500003Unfiltered Potassium Element Concentrations Grid of Australia 2019The unfiltered potassium grid is a derivative of the 2019 radiometric grid of Australia. The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data are collected on airborne geophysical surveys conducted by Commonwealth, State and Northern Territory Governments and the private sector. The 2019 unfiltered potassium grid has a cell size of about 100 m (0.001 degrees) and shows potassium element concentrations of the Australia region. Potassium is the seventh most abundant element in the Earth's crust. The potassium concentration grid can be used to locate minerals and compounds containing potassium.Airborne Digital DataPotassiumAustraliaNational Geophysical CompilationRadiometricsGeophysicsGridEarth SciencesNCIgeophys__radmap_v4_2019_unfiltered_pctkRectifiedGridCoverage112.8995 -43.7605153.6705 -8.9995112.8995 -43.760500040810406153.6705 -8.999500000938232Unfiltered Terrestrial Dose Rate Grid of Australia 2019The unfiltered terrestrial dose rate grid is a derivative of the 2019 radiometric or gamma-ray grid of Australia, which is a merge of over 600 individual gamma-ray spectrometric surveys. The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data are collected on airborne geophysical surveys conducted by Commonwealth, State and Northern Territory Governments and the private sector. The unfiltered terrestrial dose rate grid is derived as a linear combination of the unfiltered K, U and Th grids, and has a cell size of about 100m (0.001 degrees).Airborne Digital DataAustraliaNational Geophysical CompilationRadiometricsGeophysicsGridEarth SciencesNCIgeophys__radmap_v4_2019_unfiltered_doseRectifiedGridCoverage112.8995 -43.7605153.6705 -8.9995112.8995 -43.760500040810406153.6705 -8.999500000938232Unfiltered Thorium Element Concentrations Grid of Australia 2019The unfiltered thorium grid is a derivative of the 2019 radiometric or gamma-ray grid of Australia which is a merge of over 600 individual gamma-ray spectrometric surveys. The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data are collected on airborne geophysical surveys conducted by Commonwealth, State and Northern Territory Governments and the private sector. The 2019 unfiltered thorium grid has a cell size of about 100 m (0.001 degrees) and shows thorium element concentrations of the Australia region.Airborne Digital DataAustraliaNational Geophysical CompilationRadiometricsGeophysicsGridThoriumEarth Sciencesgeophys__radmap_v4_2019_unfiltered_ppmthRectifiedGridCoverage112.8995 -43.7605153.6705 -8.9995112.8995 -43.760500040810406153.6705 -8.999500000938232Unfiltered Uranium Element Concentrations grid of Australia 2019The unfiltered uranium grid is a derivative of the 2019 radiometric or gamma-ray grid of Australia which is a merge of over 600 individual gamma-ray spectrometric surveys. The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium, uranium and thorium. The data are collected on airborne geophysical surveys conducted by Commonwealth, State and Northern Territory Governments and the private sector. The 2019 unfiltered uranium grid has a cell size of about 100m (0.001 degrees) and shows uranium element concentrations of the Australia region.Airborne Digital DataUraniumAustraliaNational Geophysical CompilationRadiometricsGeophysicsEarth SciencesNCIgeophys__radmap_v4_2019_unfiltered_ppmuRectifiedGridCoverage112.8995 -43.7605153.6705 -8.9995112.8995 -43.760500040810406153.6705 -8.999500000938232