Airborne Gravity
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<div>The Canobie Airborne Gravity Gradiometer (AGG) survey of Northern Queensland was flown between 24 November and 3 December 2021. </div><div>Contracted to Xcalibur Multiphysics, Geoscience Australia undertook the project management, contract management and quality control on behalf of the Geological Survey of Queensland. </div><div>The located data, gridded data and quality control reports are contained within this record. </div><div><br></div><div>Survey area was centered on latitude 19° 31’ 04” S and longitude 140° 44’ 14” E to the north of Cloncurry. A total of 8 production flights were flown for a combined total of 4,712.4 </div><div>line kilometers of data and acquired on 1000 m line spacing at 80 m nominal terrain clearance</div><div>Quality control was performed by airborne gravity consultant Dr Mark Dransfield on behalf of Geoscience Australia, with his report included here.</div><div><br></div><div>The survey was designed to supplement the regional legacy ground gravity data and improve the definition of gravimetric anomalies in a region deemed highly prospective for base metals exploration. </div><div>In addition, the AGG survey will provide better understanding of the cover sequence thickness (estimated to be less than 100 m) and characteristics of the underlying basement geology. </div><div><br></div><div>The data was released by the Geological Survey of Queensland on March 29 and can be found at https://geoscience.data.qld.gov.au/dataset/gg100099/resource/geo-spa460972-gg100099. </div><div><br></div><div>Survey Name: Canobie airborne gravity gradiometery survey,2021</div><div>Datasets Acquired: Gravity gradiometry, digital terrain model</div><div>Geoscience Australia Project Number: P5021</div><div>Acquisition Start Date: 24/11/2021</div><div>Acquisition End Date: 03/12/2021</div><div>Flight line spacing: 1000 m</div><div>Flight line direction: East-West (090-270)</div><div>Total distance flown: 4,712 line-km</div><div>Nominal terrain clearance: 80 m</div><div>Blocks: 1</div><div>Data Acquisition: Xcalibur Multiphysics</div><div>Project Management: Geoscience Australia</div><div>Quality Control: Mark Dransfield on behalf of Geoscience Australia</div><div>Dataset Ownership: Geological Survey of Qld and Geoscience Australia</div><div><br></div><div>Included in this release:</div><div>1. Point-located Data</div><div>ASCII-column data with accompanying description and definition files.</div><div>• Gravity gradiometry data including the various corrections</div><div>• Gravity gradiometry data noise estimates</div><div>• Vertical gravity estimate including various reduction and levelled corrections</div><div>• Digital terrain model</div><div><br></div><div>2. Grids</div><div>Gridded data in ERMapper (.ers) format (GDA2020):</div><div>• Gravity gradiometry</div><div>• Free-air corrected vertical gravity</div><div>• Terrain and bouguer corrected vertical gravity</div><div>• Digital terrain model</div><div><br></div><div>3. Reports</div><div>• Contractors Logistics Report</div><div>• Quality Control Report (Mark Dransfield)</div><div><br></div><div>4. Location</div><div>• ARCGIS shape file</div><div><br></div><div><br></div><div>© Geological Survey of Queensland and Commonwealth of Australia (Geoscience Australia) 2021. With the exception of the Commonwealth Coat of Arms and where otherwise noted, this product is provided under a Creative Commons Attribution 4.0</div>
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CGG Aviation (now Xcalibur Multiphysics) collected airborne gravity data in the Kidson area covering parts of the Gibson and Great Sandy Deserts in central Western Australia as part of a collaborative project between Geoscience Australia (GA) and the Geological Survey of Western Australia (GSWA). The aim of the project was to collect airborne gravity gradiometry data in the region at 2500 m wavelength resolution to help characterise key undercover geological elements of the region. The survey consisted of a Main block and an Extension block. Data were acquired from North/South flight lines (Main block) and East-West flight lines (Extension block) with an average target ground clearance of 120m. Tie lines at 25,000m line spacing were flown only for the Main block. A total of 78,700 line kilometres of data were collected during the survey. <b>Survey details</b> Survey Name: Kidson WA airborne gravity gradiometer survey 2017 State/Territory: Western Australia Datasets Acquired: Airborne gravity gradiometer Geoscience Australia Project Number: Acquisition Start Date: July 21, 2017 Acquisition End Date: May 3, 2018 Number of blocks: 2 Flight line spacing: 2,500m Flight line direction: Area 1 - 180 deg/ NS; Area 2 - 270 deg/EW Tie line spacing: 25,000m Tie line direction: Area 1 only - 270 deg / EW Total distance flown: 78,700 line kilometres Nominal terrain clearance (above ground level): 120m Clearance method: Drape Aircraft type: 2 aircrafts with different Falcon AGG system installed - Cessna Grand Caravan 208B / Full spectrum Falcon system Kepler/Newton Data Acquisition: CGG Aviation Australia Pty Ltd Project Management: Geoscience Australia Quality Control: Dr Mark Dransfield contracted by Geoscience Australia Dataset Ownership: Western Australia and Geoscience Australia <b>Files included in this download</b> The original agreement with CGG Aviation Australia Pty Ltd (CGG) stated that gradient point located data was available for purchase on non-exclusive terms from CGG until 30 June 2027, after which date the gradient data would be made public. In July 2021, the terms of the agreement changed after Xcalibur Multiphysics acquired CGG Aviation Pty Ltd. Xcalibur authorised the release of the gradient data. A new final dataset and report was generated by Xcalibur and delivered to Geoscience Australia. This data release contains the gradient point located data. <b>1. Point-located Data / line data</b> ASEG-GDF2 and Geosoft GDB format with accompanying description and definition files. The sample frequency is 8Hz. <b>2. Grids</b> Datum: GDA2020 Projection: MGA 51 Grid cell size: 500m Formats: Geosoft GRD and ERMapper (.ers) with accompanying description files. <b>3. Reports</b> • Final survey logistic report delivered to Geoscience Australia by the survey contractor. • Kidson QC report from Dr Mark Dransfield The data from this Kidson airborne gravity gradiometry survey has been released and can be downloaded from the Geological Survey of Western Australia’s MAGIX platform at https://magix.dmirs.wa.gov.au and GeoVIEW.WA web mapping application at https://geoview.dmp.wa.gov.au/GeoView under reference number 71234.
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<div>An airborne gravity survey was conducted over the North East Canning area in the Kimberley region of Western Australia as a part of the Tanami-NE Canning Western Australia Airborne Gravity Survey 2017. The survey was part of a collaborative research project between Geoscience Australia (GA) and the Geological Survey of Western Australia. Gravity data was collected at 5 km wavelength resolution with the purpose to help characterise key undercover geological elements of the region. The survey was conducted by Thomson Aviation Pty Ltd with a GT-2A gravimeter and managed by Geoscience Australia. A total of 23,953.65 line km of data were acquired over an area of 53,346 km².</div><div><strong>Survey details</strong></div><div>Survey Name: Tanami North East Canning Airborne gravity survey</div><div>State/Territory: Western Australia (WA)</div><div>Datasets Acquired: Airborne gravity</div><div> Geoscience Australia Project Number: P1291A</div><div> Acquisition Start Date: 17 August 2017</div><div> Acquisition End Date: 15 November 2017</div><div> Flight line spacing: 2.5 km</div><div> Flight line direction: 180deg / NS</div><div> Tie line spacing: 25km</div><div> Tie line direction: 270 deg / EW</div><div>Total line kilometers: 23,953.65</div><div> Nominal terrain clearance (above ground level): 710 m</div><div> Aircraft model: GippsAero GA-8 Airvan</div><div>Data Acquisition: Thomson Aviation Pty Ltd</div><div> Project Management: Geoscience Australia</div><div> Quality Control: CMG Operations Pty Ltd and Geoscience Australia</div><div> Dataset Ownership: GSWA and Geoscience Australia</div><div><br></div><div><strong>Files included in this download </strong></div><div> </div><div>This data package release contains the final survey deliverables received from the contractor Thomson Aviation, with an initial QC by CMG Operations Pty Ltd, then peer reviewed by Dr Jack McCubbine (Geoscience Australia).</div><div> </div><div>The horizontal datum and projection for all the data are GDA94 and MGA51, respectively.</div><div> </div><div><strong>1.</strong> <strong><em>Point-located Data / line data</em></strong></div><div>ASCII column XYZ and ASEG-GDF2 format with accompanying description and definition files. </div><div><br></div><div> <strong><em>2.Grids</em></strong> –</div><div> Datum: GDA94</div><div>Projection: MGA51</div><div>Grid cell size: 500m</div><div>Format: ERMapper (.ers)</div><div>Gravity datum: AAGD07. </div><div> </div><div>There are 24 gridded data supplied in ERMapper (.ers) format. The grid cell size is 500 metres. The gravity datum used is AAGD07.</div><div><br></div><div> <strong>3. Reports</strong> </div><div> • Final survey logistic report delivered to Geoscience Australia by the survey contractor - <em>TNC-NE-CANNING-FINAL-REPORT.PDF</em></div><div>• QC report from the peer reviewing the data package: <em>Tanami - North East Canning QC report.pdf</em></div><div> </div><div>The data from this Tanami North East Canning survey can also be downloaded from the Geological Survey of Western Australia’s MAGIX platform at https://magix.dmirs.wa.gov.au and GeoVIEW.WA web mapping application at https://geoview.dmp.wa.gov.au/GeoView under reference number 71201. </div><div><br></div>
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<div>The Tanami–King Leopold survey was part of a collaborative research project between Geoscience Australia (GA) and the Geological Survey of Western Australia. Gravity data was collected at 5 km wavelength resolution with the purpose to help characterise key undercover geological elements of the region. The project area extends approximately from the Balgo Hills region near the border with the Northern Territory through to Derby in the west. The survey was conducted by Thomson Aviation Pty Ltd with a GT-2A gravimeter and managed by GA. A total of 25,869.36 line km of data were acquired over an area of 58,040 km².</div><div> </div><div><strong>Survey details</strong></div><div>Survey Name: Tanami-King Leopold WA airborne gravity survey 2017</div><div>State/Territory: Western Australia (WA)</div><div>Datasets Acquired: Airborne gravity</div><div> Geoscience Australia Project Number: P1291B</div><div> Acquisition Start Date: June 16, 2017</div><div> Acquisition End Date: August 12, 2017</div><div> Flight line spacing: 2.5 km</div><div> Flight line direction: 180deg / NS</div><div> Tie line spacing: 25km</div><div> Tie line direction: 270 deg / EW</div><div>Total line kilometers: 25,869.36</div><div> Nominal terrain clearance (above ground level): 477 m</div><div> Aircraft type: GippsAero GA-8 Airvan</div><div>Data Acquisition: Thomson Aviation </div><div> Project Management: Geoscience Australia</div><div> Quality Control: CMG Operations Pty Ltd and Geoscience Australia</div><div> Dataset Ownership: GSWA and Geoscience Australia</div><div> </div><div><strong>Files included in this download</strong></div><div>This data package release contains the final survey deliverables received from the contractor Thomson Aviation. Quality control and data processing services were provided by CMG Operations Pty Ltd and peer reviewed by Dr Jack McCubbine (Geoscience Australia).</div><div> </div><div>The horizontal datum and projection for all the data are GDA94 and MGA52, respectively.</div><div> </div><div><strong>1.</strong> <strong><em>Point-located Data / line data</em></strong></div><div>ASCII column XYZ and ASEG-GDF2 format with accompanying description and definition files.</div><div><br></div><div> <strong><em>2.Grids</em></strong> </div><div> </div><div>Datum: GDA94</div><div>Projection: MGA52</div><div>Grid cell size: 500m</div><div>Format: ERMapper (.ers)</div><div>Gravity datum: AAGD07. </div><div> </div><div>There are 24 gridded data supplied in ERMapper (.ers) format. The grid cell size is 500 metres. The gravity datum used is AAGD07. </div><div><br></div><div> <strong>3. Reports</strong> </div><div> • Final survey logistic report delivered to Geoscience Australia by the survey contractor: <em>TNC-TANAMI-FINAL-REPORT.pdf</em></div><div>• QC report from the peer reviewer of the data package: <em>Tanami King Leopold QC report.pdf</em></div><div> </div><div>The data from this Tanami King Leopold survey can also be downloaded from the Geological Survey of Western Australia’s MAGIX platform at https://magix.dmirs.wa.gov.au and GeoVIEW.WA web mapping application at https://geoview.dmp.wa.gov.au/GeoView under reference number 71200. </div><div><br></div>
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<div>In 2018, Sander Geophysics Limited (SGL) conducted six fixed-wing high-resolution gravimetric surveys for Geoscience Australia and the Geological Survey of Western Australia. Over two hundred flights were flown to complete the planned 175,825 line kilometres, with five blocks acquired within 800 km to the northeast of Laverton and one block within 500 km to the west of Kununurra (Kimberley Basin block). The survey was flown with two aircraft utilising SGL’s airborne gravity system, Airborne Inertially Referenced Gravimeter (AIRGrav). </div><div> </div><div>The survey was funded by the Department of Mines, Industry Regulation and Safety (DMIRS) Western Australia, and managed by Geoscience Australia.</div><div><br></div><div>Survey Name: Warburton East, Warburton West, Great Victoria Desert, Kimberley Basin, Little Sandy Desert East and Little Sandy Desert West Gravity Surveys, 2018</div><div>State/Territory: Western Australia</div><div>Datasets Acquired: Airborne gravity, elevation</div><div>Geoscience Australia Project Numbers: P1312, P1313, P1315, P1316, P1317, P1318 (in the survey order above)</div><div> </div><div>Acquisition Start Date: 27 April 2018</div><div>Acquisition End Date: 04 October 2018</div><div>Flight line spacing: 2,500m</div><div>Flight line direction: East-West for Sandy Desert East and West, Kimberley Basin and Warburton East surveys, North-South for Warburton West and Great Victoria Desert surveys</div><div>Tie line spacing: 25,000 m</div><div>Tie line direction: Orthogonal to flight lines</div><div>Nominal terrain clearance: Smoother drape with nominal 160 m terrain clearance</div><div>Total distance flown: 175,825 km</div><div>Data projection: MGA51 or MGA52 using the GDA94 datum</div><div>Aircraft type: Fixed wing Cessna Grand Caravan 208B</div><div>Data Acquisition: Sander Geophysics Limited</div><div>Project Management: Geoscience Australia</div><div>Quality Control: Geoscience Australia</div><div>Dataset Ownership: Western Australia Department of Mines, Industry Regulation and Safety, and Geoscience Australia</div><div><br></div><div>Data package for the 6 sub surveys:</div><div>- Contractors Report (combined)</div><div>- Line data in XYZ and ASEG GDF format</div><div>- Read me files of datasets</div><div>- Quality control reports for each survey area</div><div>- Gridded data with details below</div><div><br></div><div>GRIDS</div><div>==============</div><div>Datum: GDA94</div><div>Projection: MGA 51 or MGA 52 </div><div>Grid cell size: 500m</div><div>Formats: Grid Exchange File (.gxf) and ERMapper (.ers)</div><div><br></div><div>Name Units Description</div><div>-------------- --------- ----------------------------------------------</div><div>GRVFAL5000M µms-2 Free air gravity, 5000 m (#) full wavelength spatial filter</div><div>FVDFAL5000M Eotvos First vertical derivative of free air gravity, 5000 m (#) full wavelength spatial filter</div><div>GRVBGL5000M_267 µms-2 Full Bouguer gravity, 5000 m (#) full wavelength spatial filter, 2670 kg/m3 density</div><div>FVDBGL5000M_267 Eotvos First vertical derivative of full Bouguer gravity, 5000 m (#) full wavelength spatial filter, 2670 kg/m3 density</div><div>GRVISO5000M_267 µms-2 Isostatic residual gravity, 5000 m (#) full wavelength spatial filter, 2670 kg/m3 density</div><div>FVDISO5000M_267 Eotvos First vertical derivative of isostatic residual gravity, 5000 m (#) full wavelength spatial filter, 2670 kg/m3 density</div><div>TERRAIN m Laser terrain (above GDA94 Ellipsoid)</div><div>BAREEARTH m Bare earth terrain (above GDA94 Ellipsoid)</div><div>----------------------------------------------------------------------------------------------------------</div><div> </div><div># 5000 m wavelength filter employed for all projects other than Little Sandy Desert West where a 2500 m wavelength filter was employed instead. Read contractors report for more details</div><div><br></div><div>----------------------------------------------------------------------------------------------------------</div><div><br></div><div><br></div><div><br></div><div><br></div><div> </div><div><br></div>
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The Blackall Airborne Gravity Gradiometer (AGG) survey of Central Queensland was flown between March 11th to 6th April 2024. Contracted to Xcalibur Smart Mapping, Geoscience Australia undertook the project management, contract management and quality control on behalf of the Geological Survey of Queensland. The located data, gridded data and quality control reports are contained within this record. Survey area was centered on longitude 147° 21’ E and latitude 25° 16’ S to the south of Blackall. A total of 34 production flights were flown for a combined total of 15,705.4 line kilometres of data and acquired on 1000 m line spacing at 100 m nominal terrain clearance. Quality control was performed by airborne gravity consultant Dr Mark Dransfield on behalf of Geoscience Australia, with his report included here. The survey was designed to supplement the regional legacy ground gravity data and improve the definition of gravimetric anomalies in the region. In addition, the AGG survey will provide better understanding of the cover sequence thickness and characteristics of the underlying basement geology. The data will be released by the Geological Survey of Queensland and can be found at: https://geoscience.data.qld.gov.au/data/gravity-gradiometry/gg104288. Survey Name: Blackall airborne gravity gradiometery survey, 2024 Datasets Acquired: Gravity gradiometry, gravity, digital terrain model Geoscience Australia Project Number: P5024 Acquisition Start Date: 11/03/2024 Acquisition End Date: 06/04/2024 Flight line spacing: 1000 m Flight line direction: East-West (090-270) Total distance flown: 15,705.4 line km Nominal terrain clearance: 100 m Blocks: 1 Data Acquisition: Xcalibur Smart Mapping Project Management: Geoscience Australia Quality Control: Mark Dransfield on behalf of Geoscience Australia Dataset Ownership: Geological Survey of Queensland and Geoscience Australia Included in this release: 1. Point-located Data ASCII-column data in ASEG-GDF format with accompanying description and definition files. • Gravity gradiometry data including the various corrections • Gravity gradiometry data noise estimates • Vertical gravity estimate including various reduction and levelled corrections • Digital terrain model 2. Grids Gridded data in ERMapper (.ers) format (GDA2020/MGA zone 55): • Free-air vertical gravity gradiometry • Free-air corrected vertical gravity • Terrain and bouguer corrected vertical gravity gradiometry (densities for terrain correction: 2.0g/cm3 and 2.67 g/cm3) • Terrain and bouguer corrected vertical gravity (densities for terrain correction: 2.0g/cm3 and 2.67 g/cm3) • Conformed, terrain and bouguer corrected vertical gravity gradiometry (densities for terrain correction: 2.0g/cm3 and 2.67 g/cm3) • Conformed, terrain and bouguer vertical gravity (densities for terrain correction: 2.0g/cm3 and 2.67 g/cm3) • Digital terrain model 3. Reports • Contractors Logistics Report • Quality Control Report (Mark Dransfield)
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<div>Sander Geophysics Limited (SGL) conducted a fixed-wing high resolution gravimetric survey in the East Kimberley area of the state of Western Australia for Geoscience Australia. A total of 37,806 line kilometres of airborne gravity data were acquired using </div><div>SGL’s airborne gravity system, Airborne Inertially Referenced Gravimeter (AIRGrav). The survey was funded by the Department of Mines, Industry Regulation and Safety (DMIRS) Western Australia, and managed by Geoscience Australia.</div><div><br></div><div>The data were peer reviewed by airborne gravity expert Dr Mark Dransfield contracted by Geoscience Australia.</div><div><br></div><div>The data from this survey were released by the Geological Survey of Western Australia and can be downloaded from MAGIX under reference 71156.</div><div><br></div><div><strong>Survey details</strong></div><div>Survey Name: East Kimberley Airborne Gravity Survey 2016</div><div>State/Territory: Western Australia</div><div>Datasets Acquired: Airborne gravity, </div><div>Geoscience Australia Project Number: P1289</div><div>Acquisition Start Date: 08 October 2016</div><div>Acquisition End Date: 03 December 2016</div><div>Flight line spacing: 2,500m</div><div>Flight line direction: East-West</div><div>Tie line spacing: 25,000m</div><div>Tie line direction: North-South</div><div>Total distance flown: 37,806 line km</div><div>Nominal terrain clearance (above ground level): 160m</div><div>Aircraft type: Fixed wing Cessna Grand Caravan 208B</div><div>Data Acquisition: Sander Geophysics Limited</div><div>Project Management: Geoscience Australia</div><div>Quality Control: Geoscience Australia</div><div>Dataset Ownership: Western Australia Department of Mines, Industry Regulation and Safety, and Geoscience Australia</div><div><br></div><div><strong>Files included in this download</strong></div><div><br></div><div><strong>1. Point-located data / line data</strong> </div><div>Data in ASEG GDF2 format, with accompanying description and definition files </div><div>P1289_grav.dat – survey data</div><div>P1289_grav.dfn – survey data definition</div><div>P1289_grav.met – survey metadata</div><div><br></div><div><strong>2. Grids - 7 grid files</strong></div><div>Datum: GDA94</div><div>Projection: MGA 52 </div><div>Grid cell size: 500m</div><div>Formats: General eXchange Format (.gxf) and ERMapper (.ers) format.</div><div><br></div><div>Grid name Units Description</div><div>- GRVFAL2500M µms-2 Free air gravity, 2500m half-wavelength spatial filter</div><div>- FVDFAL2500M Eotvos First vertical derivative of free air gravity, 2500m half-wavelength spatial filter</div><div>- GRVBGL2500M_267 µms-2 Full Bouguer gravity, 2500m half-wavelength spatial filter, 2670 kg/m3 density</div><div>- FVDBGL2500M_267 Eotvos First vertical derivative of full Bouguer gravity, 2500m half-wavelength spatial filter, 2670 kg/m3 density</div><div>- GRVISO2500M_267 µms-2 Isostatic residual gravity, 2500m half-wavelength spatial filter, 2670 kg/m3 density</div><div>- FVDISO2500M_267 Eotvos First vertical derivative of isostatic residual gravity, 2500m half-wavelength spatial filter, 2670 kg/m3 density</div><div>- BAREEARTH m Bare earth terrain (above GDA94 Ellipsoid)</div><div><br></div><div><strong>3. Reports</strong> </div><div>- Delivery Information from contractor: Delivery Information - East Kimberley AIRGrav.pdf</div><div>- Final technical report from the contractor: East Kimberley 2016 TR-842-002.pdf </div><div>- Quality control report: East Kimberley 2016 QC report.pdf </div><div><br></div>
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<div>Sander Geophysics Limited (SGL) conducted a fixed-wing high resolution airborne gravimetric survey over two survey blocks, Pilbara Northwest and Pilbara Southeast in Northwestern Australia for Geoscience Australia and its partner the Geological Survey of Western Australia (GSWA). </div><div>The traverse lines were oriented east-west in the Pilbara Northwest block and north-south in the Pilbara Southeast block and spaced at 2500 m. A limited number of control lines flown exclusively in the Pilbara Northwest block were oriented north-south and spaced at 50,000 m. A drape surface was created taking into account the terrain and the performance of the aircraft at the expected altitudes and estimated temperatures. The survey was flown with a target clearance of survey 160m above ground level. </div><div> </div><div><strong>Survey details </strong></div><div>Survey Name: Pilbara WA airborne gravity surveys 2019</div><div>State/Territory: Western Australia (WA)</div><div>Datasets Acquired: Airborne gravity</div><div> Geoscience Australia Project Number: P1314</div><div> Acquisition Start Date: April 23, 2019</div><div> Acquisition End Date: June 16, 2019</div><div> Flight line spacing: 2500m</div><div> Flight line direction: 270deg / EW (Pilbara NW); 180deg / NS (Pilbara SE)</div><div> Control line spacing: 50,000m – Pilbara NW only</div><div> Control line direction: 180 deg / NS – Pilbara NW only</div><div>Total line kilometers: 69,943</div><div> Nominal terrain clearance (above ground level): 160m</div><div> Aircraft type: Cessna Grand Caravan 208B</div><div>Data Acquisition: Sander Geophysics Limited </div><div> Project Management: Geoscience Australia</div><div> Quality Control: Geoscience Australia</div><div> Dataset Ownership: GSWA and Geoscience Australia</div><div> </div><div>This data package release contains the final survey deliverables received from the contractor SGL, and peer reviewed by Dr Mark Dransfield.</div><div> </div><div><strong>1.</strong> <strong><em>Point-located Data / line data</em></strong></div><div>ASCII XYZ and ASEG-GDF2 format with accompanying description and definition files.</div><div><br></div><div><strong><em>2.Grids</em></strong> in General eXchange Format (.gxf) and ERMapper format (.ers)</div><div> Datum: GDA94</div><div>Projection: MGA 50</div><div>Grid cell size: 500m</div><div>A full wavelength spatial filter of 5000m was applied to all the gravity grids. See details in the readme files.</div><div><br></div><div> <strong>3. Readme files</strong></div><div>- PNW-readme-grav.txt </div><div>- PSE-readme-grav.txt</div><div><br></div><div><strong>4. Reports</strong> </div><div> - Final survey logistic report (Pilbara SE and NW) from the contractor: P1314_Pilbara_2019_TR-878-000.pdf </div><div>- Pilbara NW survey QC report by M Dransfield: Pilbara NW AG QC report.pdf </div><div>- Pilbara SE survey QC report by M Dransfield: Pilbara SE AG QC report.pdf</div><div><br></div><div> The data from this Pilbara survey are also available for download from https://geoview.dmp.wa.gov.au/GeoView under reference number 71470.</div>
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The Etheridge Airborne Gravity Gradiometer (AGG) survey of Northern Queensland was flown between April 8th to 1st June 2024. Contracted to Xcalibur Smart Mapping, Geoscience Australia undertook the project management, contract management and quality control on behalf of the Geological Survey of Queensland. The located data, gridded data and quality control reports are contained within this record. Survey area was centered on longitude 143° 31’ E and latitude 18° 27’ S to the east of Croydon. A total of 53 production flights were flown for a combined total of 32,482.0 line kilometres of data and acquired on 1000 m line spacing at 100 m nominal terrain clearance. Quality control was performed by airborne gravity consultant Dr Mark Dransfield on behalf of Geoscience Australia, with his report included here. The survey was designed to supplement the regional legacy ground gravity data and improve the definition of gravimetric anomalies in the region. In addition, the AGG survey will provide better understanding of the cover sequence thickness and characteristics of the underlying basement geology. The data will also be released by the Geological Survey of Queensland and can be found at: https://geoscience.data.qld.gov.au/data/gravity-gradiometry/gg104290. Survey Name: Etheridge airborne gravity gradiometery survey, 2024 Datasets Acquired: Gravity gradiometry, gravity, digital terrain model Geoscience Australia Project Number: P5025 Acquisition Start Date: 08/04/2024 Acquisition End Date: 01/06/2024 Flight line spacing: 1000 m Flight line direction: East-West (090-270) Total distance flown: 32,482.0 line km Nominal terrain clearance: 100 m Blocks: 1 Data Acquisition: Xcalibur Smart Mapping Project Management: Geoscience Australia Quality Control: Mark Dransfield on behalf of Geoscience Australia Dataset Ownership: Geological Survey of Queensland and Geoscience Australia Included in this release: 1. Point-located Data ASCII-column data in ASEG-GDF format with accompanying description and definition files. • Gravity gradiometry data including the various corrections • Gravity gradiometry data noise estimates • Vertical gravity estimate including various reduction and levelled corrections • Digital terrain model 2. Grids Gridded data in ERMapper (.ers) format (GDA2020/MGA zone 54): • Free-air vertical gravity gradiometry • Free-air corrected vertical gravity • Terrain and bouguer corrected vertical gravity gradiometry (densities for terrain correction: 2.3g/cm3 and 2.67 g/cm3) • Terrain and bouguer corrected vertical gravity (densities for terrain correction: 2.3g/cm3 and 2.67 g/cm3) • Conformed, terrain and bouguer corrected vertical gravity gradiometry (densities for terrain correction: 2.3g/cm3 and 2.67 g/cm3) • Conformed, terrain and bouguer vertical gravity (densities for terrain correction: 2.3g/cm3 and 2.67 g/cm3) • Digital terrain model 3. Reports • Contractors Logistics Report • Quality Control Report (Mark Dransfield)