Authors / CoAuthors
Miller, R. | Goodwin, J. | Wilford, J. | McInnes, D.
Abstract
<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>
Product Type
dataset
eCat Id
149130
Contact for the resource
Resource provider
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Point of contact
- Contact instructions
- MEG
Digital Object Identifier
Keywords
- ( Project )
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- Geophysical Acquisition and Processing Section
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- machine learning
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- grids
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- raster
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- Total Magnetic Intensity
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- TMI
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- gravity
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- Reduction to Pole
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- RTP
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- analytic signal
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- tilt
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- phase map
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- residual
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- upward continuation
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- vertical integral
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- De-trended Global Isostatic Residual
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- DGIR
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- Free-Air Anomaly
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- FAA
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- Complete Bouguer Anomaly
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- horizontal derivative
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- band pass
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- vertical derivative
- theme.ANZRC Fields of Research.rdf
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- Magnetism and palaeomagnetismGravimetrics
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- Published_External
Publication Date
2024-07-08T07:02:56
Creation Date
2024-07-01T20:00:00
Security Constraints
Legal Constraints
Status
completed
Purpose
Grids created for input into data analysis and machine learning projects. See 'Grids_for_Machine_Learning_dataset_notes.pdf' for a list of all grids.
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Lineage
<div>This dataset publication was created by the Geophysical Acquisition and Processing (GAP) and Integrated Geological Mapping (IGM) sections at Geoscience Australia in 2024. Please refer to the release notes (Grids_for_Machine_Learning_dataset_notes.pdf) for a description of how the data were processed.</div>
Parent Information
Extents
[-44.00, -9.00, 112.00, 154.00]
Reference System
Spatial Resolution
Service Information
Associations
Source Information