WMS Web Map Service of Geoscience Australia's national geophysical grids for magnetics, gravity and radiometrics - 2019 edition. The service also contains outlines and descriptions of the airborne geophysical surveys used to compile the magnetic and radiometric grids. gravity airborne gravity magnetism total magnetic intensity (TMI) airborne magnetics radiometrics airborne digital data geophysical survey geophysics grid AWAGS WMS Australia Client Services Geoscience Australia Postal

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This product is released under the Creative Commons Attribution 4.0 International Licence. http://creativecommons.org/licenses/by/4.0/legalcode text/xml image/png application/atom+xml application/geopackage+sqlite3 application/json;type=utfgrid application/pdf application/rss+xml application/vnd.google-earth.kml+xml application/vnd.google-earth.kml+xml;mode=networklink application/vnd.google-earth.kmz image/geotiff image/geotiff8 image/gif image/jpeg image/png; mode=8bit image/svg+xml image/tiff image/tiff8 image/vnd.jpeg-png image/vnd.jpeg-png8 text/html; subtype=openlayers text/html; subtype=openlayers2 text/html; subtype=openlayers3 text/plain application/vnd.ogc.gml text/xml application/vnd.ogc.gml/3.1.1 text/xml; subtype=gml/3.1.1 text/html application/json XML INIMAGE BLANK JSON This Web Map Service contains Australian national scale grids of geophysical data, including Total Magnetic Intensity, Bouguer Gravity, and Gamma-Ray Spectrometry (radiometrics - K, Th, U). The grids were compiled by combining publically available government- and company-acquired airborne magnetic and radiometric surveys and ground-based gravity surveys in Australia and its surrounding marine area, and where appropriate, satellite-acquired data in the Australian region. EPSG:4283 EPSG:4326 EPSG:3857 EPSG:20248 EPSG:20249 EPSG:20250 EPSG:20251 EPSG:20252 EPSG:20253 EPSG:20254 EPSG:20255 EPSG:20256 EPSG:20257 EPSG:20258 EPSG:28348 EPSG:28349 EPSG:28350 EPSG:28351 EPSG:28352 EPSG:28353 EPSG:28354 EPSG:28355 EPSG:28356 EPSG:28357 EPSG:28358 EPSG:32748 EPSG:32749 EPSG:32750 EPSG:32751 EPSG:32752 EPSG:32753 EPSG:32754 EPSG:32755 EPSG:32756 EPSG:32757 EPSG:32758 EPSG:3110 EPSG:3111 EPSG:3112 EPSG:3031 EPSG:3032 EPSG:3308 EPSG:3107 CRS:84 -180.0 180.0 -90.0 90.0 This layer group contains 2D surface wave velocity maps at eight frequencies from Ambient noise tomography (ANT) of AusArray year one data 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 tomography ANT AusArray EPSG:28353 128.14334552974142 142.38235756363522 -26.446683726899924 -14.348129340643403 text/html geophys:ant_ausarray_year_one_0-0500hz Ambient 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 tomography ANT AusArray EPSG:4326 CRS:84 130.9875 143.0125 -23.0125 -15.9875 text/html geophys:ant_ausarray_year_one_0-0625hz Ambient 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 tomography ANT AusArray EPSG:4326 CRS:84 130.9875 143.0125 -23.0125 -15.9875 text/html geophys:ant_ausarray_year_one_0-0833hz Ambient 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 tomography ANT AusArray EPSG:4326 CRS:84 130.9875 143.0125 -23.0125 -15.9875 text/html geophys:ant_ausarray_year_one_0-1000hz Ambient 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 tomography ANT AusArray EPSG:4326 CRS:84 130.9875 143.0125 -23.0125 -15.9875 text/html geophys:ant_ausarray_year_one_0-1250hz Ambient 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 tomography ANT AusArray EPSG:4326 CRS:84 130.9875 143.0125 -23.0125 -15.9875 text/html geophys:ant_ausarray_year_one_0-1667hz Ambient 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 tomography ANT AusArray EPSG:4326 CRS:84 130.9875 143.0125 -23.0125 -15.9875 text/html geophys:ant_ausarray_year_one_0-2000hz Ambient 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 tomography ANT AusArray EPSG:4326 CRS:84 130.9875 143.0125 -23.0125 -15.9875 text/html geophys:ant_ausarray_year_one_0-2500hz Ambient 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 tomography ANT AusArray EPSG:4326 CRS:84 130.9875 143.0125 -23.0125 -15.9875 text/html geophys:ant_ausarray_continental_scale This 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/10.26186/149637 Ambient Noise Tomography ANT AusArray EPSG:4326 CRS:84 112.9875 155.0125 -44.0125 -10.9875 text/html This layergroup contains Australian national scale grids of geophysical data, including Total Magnetic Intensity, Bouguer Gravity, and Gamma-Ray Spectrometry (radiometrics - K, Th, U). The grids were compiled by combining publically available government- and company-acquired airborne magnetic and radiometric surveys and ground-based gravity surveys in Australia and its surrounding marine area, and where appropriate, satellite-acquired data in the Australian region. EPSG:4326 -180.0 180.0 -90.0 90.0 A collection of geophysical grids and images published in 2019. EPSG:4283 95.46957380455862 164.0025314 -48.002403447550265 -7.907466000825701 A collection of gravity grids and images published in 2019. EPSG:4326 107.99791666633806 164.0025314 -48.00240340727514 -7.997916667278787 text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain geophys:2019_A1_FAA This 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. Australia image Free Air Anomaly gravity EPSG:4283 CRS:84 107.99791666666667 164.00208333333336 -48.00208337360861 -7.997916667278789 text/plain geophys:2019_A1_FAA_Hillshade_HSI_GeoTIFF This 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. hillshade Australia image Free Air Anomaly gravity EPSG:4283 CRS:84 107.99791666666665 164.00208333333333 -48.002083373608606 -7.99791666727879 text/plain geophys:2019_A4_CBA This 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. Australia grid Free Air Anomaly gravity EPSG:4283 CRS:84 107.99791666666667 164.00208333333336 -48.00208337360861 -7.997916667278789 text/plain geophys:2019_A4_CBA_wide_linear_color_Hillshade_HSI_GeoTIFF This 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. hillshade Bouguer Australia image gravity EPSG:4283 CRS:84 107.99791666666665 164.00208333333333 -48.002083373608606 -7.99791666727879 text/plain geophys:2019_A7_DGIR_Hillshade_HSI_GeoTIFF This 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. hillshade image Australia gravity EPSG:4283 CRS:84 107.9979167 164.0025314 -48.00240340727514 -7.997916667612118 text/plain geophys:2019_A7_DGIR_v2 This 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. hillshade grid Australia gravity EPSG:4283 CRS:84 107.99791666666667 164.00208333333336 -48.00208337360861 -7.997916667278789 text/plain geophys:2019_B1_FAA This 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. hillshade Bouguer Australia grid gravity EPSG:4283 CRS:84 107.99791666666667 164.00208333333336 -48.00208337360861 -7.997916667278789 text/plain geophys:2019_B1_FAA_Hillshade_HSI_GeoTIFF This 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. hillshade Bouguer Australia image gravity EPSG:4283 CRS:84 107.99791666666665 164.00208333333333 -48.002083373608606 -7.99791666727879 text/plain geophys:2019_B4_CBA This 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. hillshade Bouguer Australia grid gravity EPSG:4283 CRS:84 107.99791666666667 164.00208333333336 -48.00208337360861 -7.997916667278789 text/plain geophys:2019_B4_CBA_wide_linear_color_Hillshade_HSI_GeoTIFF This 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. hillshade Bouguer Australia image gravity EPSG:4283 CRS:84 107.99791666666665 164.00208333333333 -48.002083373608606 -7.99791666727879 text/plain geophys:2019_B7_DGIR_Hillshade_HSI_GeoTIFF This 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. hillshade Australia geophysics isostatic gravity EPSG:4283 CRS:84 107.9979167 164.0025314 -48.00240340727514 -7.997916667612118 text/plain geophys:2019_B7_DGIR_v2 This 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. grid geophysics isostatic gravity Australia EPSG:4283 CRS:84 107.99791666666667 164.00208333333336 -48.00208337360861 -7.997916667278789 text/plain geophys:AusDrape2019_ellipsoid This 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. Australia geoid grid gravity EPSG:4283 CRS:84 107.99791666666667 164.00208333333336 -48.00208337360861 -7.997916667278789 text/plain geophys:AusDrape2019_ellipsoid_Hillshade_HSI_GeoTIFF This 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. hillshade Australia geoid image gravity EPSG:4283 CRS:84 107.99791666666665 164.00208333333333 -48.002083373608606 -7.99791666727879 text/plain geophys:AusDrape2019_geoid 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. Australia geoid grid gravity EPSG:4283 CRS:84 107.99791666666667 164.00208333333336 -48.00208337360861 -7.997916667278789 text/plain geophys:AusDrape2019_geoid_Hillshade_HSI_GeoTIFF 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. hillshade Australia geoid image gravity EPSG:4283 CRS:84 107.99791666666665 164.00208333333333 -48.002083373608606 -7.99791666727879 text/plain geophys:Surface2019_ellipsoid This 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. Australia ellipsoid grid geophysics gravity EPSG:4283 CRS:84 107.99791666666667 164.00208333333336 -48.00208337360861 -7.997916667278789 text/plain geophys:Surface2019_ellipsoid_Hillshade_HSI_GeoTIFF This 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. Australia ellipsoid image geophysics gravity EPSG:4283 CRS:84 107.99791666666665 164.00208333333333 -48.002083373608606 -7.99791666727879 text/plain geophys:Surface2019_geoid This 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. Australia geoid grid geophysics gravity EPSG:4283 CRS:84 107.99791666666667 164.00208333333336 -48.00208337360861 -7.997916667278789 text/plain geophys:Surface2019_geoid_Hillshade_HSI_GeoTIFF This 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. Australia geoid image geophysics gravity EPSG:4283 CRS:84 107.99791666666665 164.00208333333333 -48.002083373608606 -7.99791666727879 text/plain geophys:Gravmap2019-grid-grv_fa-IncludesAirborne Australia gravity grid EPSG:4283 CRS:84 107.99791666666667 164.00208333333336 -48.00208337360861 -7.997916667278789 text/plain geophys:Gravmap2019-grid-grv_fa 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. Australia gravity grid EPSG:4283 CRS:84 107.99791666666667 164.00208333333336 -48.00208337360861 -7.997916667278789 text/plain geophys:Gravmap2019-grid-grv_dtgir-IncludesAirborne Australia gravity grid EPSG:4283 CRS:84 107.99791666666667 164.00208333333336 -48.00208337360861 -7.997916667278789 text/plain geophys:Gravmap2019-grid-grv_dtgir_tilt-IncludesAirborne 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 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. Australia gravity grid EPSG:4283 CRS:84 107.99791666666667 164.00208333337815 -48.00208337364061 -7.997916667278788 text/plain geophys:Gravmap2019-grid-grv_dtgir_tilt 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 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. Australia gravity grid EPSG:4283 CRS:84 107.99791666666667 164.00208333337815 -48.00208337364061 -7.997916667278788 text/plain geophys:Gravmap2019-grid-grv_dtgir 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 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. Australia gravity grid EPSG:4283 CRS:84 107.99791666666667 164.00208333333336 -48.00208337360861 -7.997916667278789 text/plain geophys:Gravmap2019-grid-grv_dtgir_05vd-IncludesAirborne 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 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. Australia gravity grid EPSG:4283 CRS:84 107.99791666633806 164.00208333304954 -48.00208337364061 -7.997916667278788 text/plain geophys:Gravmap2019-grid-grv_dtgir_05vd 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 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. Australia gravity grid EPSG:4283 CRS:84 107.99791666633806 164.00208333304954 -48.00208337364061 -7.997916667278788 text/plain geophys:Gravmap2019-grid-grv_dtgir_1vd-IncludesAirborne 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 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. Australia gravity grid EPSG:4283 CRS:84 107.99791666633806 164.00208333304954 -48.00208337364061 -7.997916667278788 text/plain geophys:Gravmap2019-grid-grv_dtgir_1vd 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 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. Australia gravity grid EPSG:4283 CRS:84 107.99791666633806 164.00208333304954 -48.00208337364061 -7.997916667278788 text/plain geophys:Gravmap2019-grid-grv_cscba-IncludesAirborne 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. Australia gravity grid EPSG:4283 CRS:84 107.99791666666667 164.00208333333336 -48.00208337360861 -7.997916667278789 text/plain geophys:Gravmap2019-grid-grv_cscba_tilt-IncludesAirborne Australia gravity grid EPSG:4283 CRS:84 107.99791666666667 164.00208333337815 -48.00208337364061 -7.997916667278788 text/plain geophys:Gravmap2019-grid-grv_cscba_tilt Gravity data measure small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This National Gravity Compilation 2019 tilt grid is derived from the 2019 Australian National Gravity Grids A series. These gravity data were acquired under the project No. 202008. The grid has a cell size of 0.00417 degrees (approximately 435m). This gravity anomaly grid is derived from ground observations stored in the Australian National Gravity Database (ANGD) as at September 2019, supplemented with offshore data sourced from v28.1 of the Global Gravity grid developed using data from the Scripps Institution of Oceanography, the National Oceanic and Atmospheric Administration (NOAA), and National Geospatial-Intelligence Agency (NGA) at Scripps Institution of Oceanography, University of California San Diego. Out of the approximately 1.8 million gravity observations, nearly 1.4 million gravity stations in the ANGD with marina data were used to generate this grid. The ground gravity data used in this grid has been acquired by the Commonwealth, State and Territory Governments, the mining and exploration industry, universities and research organisations from the 1940's to the present day. Station spacing varies from approximately 11 km down to less than 1 km, with major parts of the continent having station spacing between 2.5 and 7 km. Terrain corrections to gravity were calculated using both offshore bathymetry and onshore topography data. A tilt filter was then applied to the complete spherical cap Bouguer anomaly (A series) to produce this grid covering Australia and its continental margins. Australia gravity grid EPSG:4283 CRS:84 107.99791666666667 164.00208333337815 -48.00208337364061 -7.997916667278788 text/plain geophys:Gravmap2019-grid-grv_cscba Australia gravity grid EPSG:4283 CRS:84 107.99791666666667 164.00208333333336 -48.00208337360861 -7.997916667278789 text/plain geophys:Gravmap2019-grid-grv_cscba_05vd-IncludesAirborne Australia gravity grid EPSG:4283 CRS:84 107.99791666633806 164.00208333304954 -48.00208337364061 -7.997916667278788 text/plain geophys:Gravmap2019-grid-grv_cscba_05vd 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 - 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. Australia gravity grid EPSG:4283 CRS:84 107.99791666633806 164.00208333304954 -48.00208337364061 -7.997916667278788 text/plain geophys:Gravmap2019-grid-grv_cscba_1vd-IncludesAirborne Australia gravity grid EPSG:4283 CRS:84 107.99791666666667 164.00208333337815 -48.00208337364061 -7.997916667278788 text/plain geophys:Gravmap2019-grid-grv_cscba_1vd Australia gravity grid EPSG:4283 CRS:84 107.99791666633806 164.00208333304954 -48.00208337364061 -7.997916667278788 text/plain A collection of magnetic grids and images published in 2019. EPSG:4326 95.4695738045586 162.65938610455862 -47.77337134002573 -7.90746600023924 text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain geophys:magmap_v7_2019_TMI Total 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 Data earth Sciences TMI Australia Magnetics grid geophysics NCI EPSG:4283 CRS:84 105.99958335 154.66347005 -43.930099090841246 -9.026495250948122 text/plain geophys:tmi_hsi_v2_white Total 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 Data Image Australia HSI Radiometrics EPSG:4283 CRS:84 105.99958335000001 154.66346335 -43.92944662384115 -9.026495250948125 text/plain geophys:magmap_v7_2019_TMI_40m Total 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. TMI Australia National Geophysical Compilation Magnetics Geophysics Airborne Digital data Grid Earth Sciences NCI EPSG:4283 CRS:84 105.99979175 154.66323525 -43.93023669084127 -9.026703650948198 text/plain geophys:magmap_v7_2019_RTP Total 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. Australia National Geophysical Compilation Magnetics Reduction To Pole RTP Geophysics Earth Sciences NCI EPSG:4283 CRS:84 95.46957380455862 162.65938610455862 -47.77337134002572 -7.90746600023924 text/plain geophys:magmap_v7_2019_1VD Total 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 Data NCI Australia National Geophysical Compilation Geophysics Magenetics Grid Earth Sciences Vertical Derivative EPSG:4283 CRS:84 95.46957380455862 162.65938610455862 -47.77337134002572 -7.90746600023924 text/plain geophys:magmap_v7_2019_VRTP_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. magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_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. magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_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. magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_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. magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_uc24km30kmres magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_uc16km20kmres magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_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. magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_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. magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_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. magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_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. magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_uc1km2kmres magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_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. magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_pGRAV_THD This 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. magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_pGRAV magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_VBzz This 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. magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_05VD This 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. magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_1VD 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. magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain geophys:magmap_v7_2019_VRTP_AS 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. magnetics grid geophysics Australia EPSG:4283 CRS:84 105.99958334997916 154.66347004997917 -43.93009909082764 -9.026495250934511 text/plain text/plain A collection of radiometric grids and images published in 2019. EPSG:4326 112.89949999999997 153.6705 -43.76050004081041 -8.999500000938232 text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain geophys:radmap_v4_2019_filtered_dose The 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 Data NCI Australia National Geophysical Compilation Radiometrics Geophysics Grid Earth Sciences Terrestrial Dose Rate EPSG:4283 CRS:84 112.8995 153.6705 -43.760500040810406 -8.999500000938232 text/plain geophys:radmap_v4_2019_filtered_pctk The 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. Potassium Australia National Geophysical Compilation Radiometrics Geophysics Grid Earth Sciences NCI EPSG:4283 CRS:84 112.8995 153.6705 -43.760500040810406 -8.999500000938232 text/plain geophys:radmap_v4_2019_ratio_uk The 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 Data Potassium Australia National Geophysical Compilation Radiometrics Geophysics Grid Earth Sciences NCI EPSG:4283 CRS:84 112.8995 153.6705 -43.760500040810406 -8.999500000938232 text/plain geophys:radmap_v4_2019_filtered_ppmth The 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 Data Australia National Geophysical Compilation Radiometrics Geophysics Grid Thorium Earth Sciences EPSG:4283 CRS:84 112.8995 153.6705 -43.760500040810406 -8.999500000938232 text/plain geophys:radmap_v4_2019_filtered_ppmu The 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. Uranium National Geophysical Compilation Radiometrics Geophysics Grid Airborne Digital Data Radiometrics Earth Sciences NCI EPSG:4283 CRS:84 112.8995 153.6705 -43.760500040810406 -8.999500000938232 text/plain geophys:radmap_v4_2019_ratio_tk The 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. Australia National Geophysical Compilation Radiometrics Grid Earth Sciences NCI EPSG:4283 CRS:84 112.8995 153.6705 -43.760500040810406 -8.999500000938232 text/plain geophys:radmap_v4_2019_unfiltered_pctk The 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 Data Potassium Australia National Geophysical Compilation Radiometrics Geophysics Grid Earth Sciences NCI EPSG:4283 CRS:84 112.8995 153.6705 -43.760500040810406 -8.999500000938232 text/plain geophys:radmap_v4_2019_ratio_u2t The 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 Data Australia National Geophysical Compilation Geophysics Grid Earth Sciences NCI EPSG:4283 CRS:84 112.8995 153.6705 -43.760500040810406 -8.999500000938232 text/plain geophys:radmap_v4_2019_ratio_ut The 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 Data Australia National Geophysical Compilation Radiometrics Geophysics Earth Sciences NCI EPSG:4283 CRS:84 112.8995 153.6705 -43.760500040810406 -8.999500000938232 text/plain geophys:radmap_v4_2019_unfiltered_dose The 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 Data Australia National Geophysical Compilation Radiometrics Geophysics Grid Earth Sciences NCI EPSG:4283 CRS:84 112.8995 153.6705 -43.760500040810406 -8.999500000938232 text/plain geophys:radmap_v4_2019_unfiltered_ppmth The 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 Data Australia National Geophysical Compilation Radiometrics Geophysics Grid Thorium Earth Sciences EPSG:4283 CRS:84 112.8995 153.6705 -43.760500040810406 -8.999500000938232 text/plain geophys:radmap_v4_2019_unfiltered_ppmu The 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 Data Uranium Australia National Geophysical Compilation Radiometrics Geophysics Earth Sciences NCI EPSG:4283 CRS:84 112.8995 153.6705 -43.760500040810406 -8.999500000938232 text/plain geophys:radmap_v4_2019_filtered_ternary_image The 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). potassium uranium Australia radiometrics thorium image ternary geophysics EPSG:4283 CRS:84 112.89949999999999 153.6705 -43.76050004081041 -8.999500000938234 text/plain A collection of geophysical grids and images published in 2015. EPSG:4283 99.9641665 169.96969950000005 -51.949074576699594 -7.870434012920769 A collection of gravity grids and images published in 2015. EPSG:4326 99.96416649999999 169.9696995 -51.9490745 -7.870434011255909 text/plain text/plain text/plain geophys:Aust_onshore_only_Bouguer_gravity_2010 The 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. Bouguer gravity geophysics image Australia EPSG:4283 CRS:84 112.86796049999998 153.6246635 -43.7028145 -8.987536500000001 text/plain geophys:Aust_gravity_anomaly_2010 The 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. gravity geophysics image Australia EPSG:4283 CRS:84 99.96416649999999 169.9696995 -51.9490745 -7.984166500000001 text/plain geophys:Aust_gravity_bandpass_hsi_image_2009 Hue-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. Bouguer gravity geophysics image Australia EPSG:4283 CRS:84 109.91145110930562 160.61705110930563 -50.60323401125593 -7.870434011255909 text/plain A collection of magnetic grids and images published in 2015. EPSG:4326 112.5033654425 154.663348579 -43.92981420550001 -9.026494833500001 text/plain text/plain text/plain geophys:magmap_v6_2015_tmi_HSI The 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. magnetics total magnetic intensity image HSI geophysics Australia EPSG:4283 CRS:84 112.5033654425 154.6633485785 -43.9298142055 -9.026494833500001 text/plain geophys:magmap_V6_2015_VRTP1 The 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. magnetics total magnetic intensity image HSI geophysics Australia EPSG:4283 CRS:84 112.504198776 154.663348579 -43.9289808725 -9.0273281665 text/plain geophys:magmap_V6_2015 The 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. magnetics total magnetic intensity image geophysics Australia EPSG:4283 CRS:84 112.50336544250003 154.66334857850003 -43.92981420550001 -9.026494833500003 text/plain A collection of radiometric grids and images published in 2015. EPSG:4326 112.7165 153.6705 -43.7605 -8.9995 text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain text/plain geophys:radmap_v3_2015_ratio_u2tx Ratio 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. radiometrics geophysics geophysical survey airborne digital data grid Australia EPSG:4283 CRS:84 112.7165 153.6705 -43.7605 -8.9995 text/plain geophys:radmap_v3_2015_ratio_ut_x Ratio 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. radiometrics geophysics geophysical survey airborne digital data grid Australia EPSG:4283 CRS:84 112.7165 153.6705 -43.7605 -8.9995 text/plain geophys:radmap_v3_2015_ratio_uk_x Ratio 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. radiometrics geophysics geophysical survey airborne digital data grid Australia EPSG:4283 CRS:84 112.7165 153.6705 -43.7605 -8.9995 text/plain geophys:radmap_v3_2015_ratio_tk_x Ratio 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. radiometrics geophysics geophysical survey airborne digital data grid Australia EPSG:4283 CRS:84 112.7165 153.6705 -43.7605 -8.9995 text/plain geophys:radmap_v3_2015_filtered_ppmu_x Low-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. radiometrics geophysics geophysical survey airborne digital data grid Australia EPSG:4283 CRS:84 112.7165 153.6705 -43.7605 -8.9995 text/plain geophys:radmap_v3_2015_unfiltered_ppmu Unfiltered 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. radiometrics geophysics geophysical survey airborne digital data grid Australia EPSG:4283 CRS:84 112.7165 153.6705 -43.7605 -8.9995 text/plain geophys:radmap_v3_2015_filtered_ppmth_x Low-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. radiometrics geophysics geophysical survey airborne digital data grid Australia EPSG:4283 CRS:84 112.7165 153.6705 -43.7605 -8.9995 text/plain geophys:radmap_v3_2015_unfiltered_ppmth Unfiltered 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. radiometrics geophysics geophysical survey airborne digital data grid Australia EPSG:4283 CRS:84 112.7165 153.6705 -43.7605 -8.9995 text/plain geophys:radmap_v3_2015_filtered_pctk_x Low-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. radiometrics geophysics geophysical survey airborne digital data grid Australia EPSG:4283 CRS:84 112.7165 153.6705 -43.7605 -8.9995 text/plain geophys:radmap_v3_2015_unfiltered_pctk Unfiltered 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. radiometrics geophysics geophysical survey airborne digital data grid Australia EPSG:4283 CRS:84 112.7165 153.6705 -43.7605 -8.9995 text/plain geophys:radmap_v3_2015_filtered_dose_x Terrestrial 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. radiometrics geophysics geophysical survey airborne digital data grid Australia EPSG:4283 CRS:84 112.7165 153.6705 -43.7605 -8.9995 text/plain geophys:radmap_v3_2015_unfiltered_dose Unfiltered 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. radiometrics geophysics geophysical survey airborne digital data grid Australia EPSG:4283 CRS:84 112.7165 153.6705 -43.7605 -8.9995 text/plain