grids
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This web service provides access to gridded data produced by Geoscience Australia from studies of Australian groundwater and hydrogeological systems.
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This web service provides access to gridded data produced by Geoscience Australia from studies of Australian groundwater and hydrogeological systems.
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This web service provides access to gridded data produced by Geoscience Australia from studies of Australian groundwater and hydrogeological systems.
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<div><strong>Purpose</strong></div><div>This package comprises a set of 86 thematic grids (rasters) derived from national coverages of gravity and magnetic survey data. These datasets provide valuable information about the distribution of geological features, physical property variations, and the composition of the Earth's crust. All grids have been resampled to the same cell size, map extent, and projection to allow them to be integrated into predictive mapping and modelling workflows using machine learning. Users can download individual grids or the whole grid package. </div><div> </div><div><strong>Input Data</strong></div><div>The following Australian national datasets were used:</div><div>1. 2019 Australian National Gravity Grids: Free Air Anomaly, Complete Bouguer Anomaly, De-trended Global Isostatic Residual, 400 m cell size (Lane <em>et al</em>., 2020).</div><div>2. Total Magnetic Intensity (TMI) Grid of Australia 2019 - seventh edition Enhanced Products Package (Morse, 2020).</div><div><br></div><div><strong>Processing</strong></div><div>All processing of the national grids were undertaken using Intrepid software. The following was performed on the input data:</div><div>1. The grids were reprojected from GDA94 geodetic to Australian Albers (EPSG 3577). </div><div>2. The grids were aligned to the same grid cell registration point and interpolated to fit within an 80 m cell size using a cubic spline method to ensure that the cell locations for all images are common.</div><div>3. Various Fast Fourier Transforms (FFT) were applied to each grid (see ‘Grids_for_Machine_Learning_dataset_notes.pdf’). </div><div> </div><div><strong>Metadata (all grids)</strong></div><div>· Datum: GDA94</div><div>· Projection: Australian Albers (EPSG 3577)</div><div>· Cell size: 80 m</div><div>· File format: GeoTiff (.tif)</div> <b>Data is available on request from clientservices@ga.gov.au - Quote eCat# 149130</b>
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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>