Data

National Gravity and Magnetic Derivatives Customised for Data Analysis and Machine Learning

Name: National Gravity and Magnetic Derivatives Customised for Data Analysis and Machine Learning
Published: 2024

Geoscience Australia

Miller, R. ; Goodwin, J. ; Wilford, J. ; McInnes, D.

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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://pid.geoscience.gov.au/dataset/ga/149130&rft.title=National Gravity and Magnetic Derivatives Customised for Data Analysis and Machine Learning&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/149130&rft.publisher=Commonwealth of Australia (Geoscience Australia)&rft.description=PurposeThis 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. Input DataThe following Australian national datasets were used:1. 2019 Australian National Gravity Grids: Free Air Anomaly, Complete Bouguer Anomaly, De-trended Global Isostatic Residual, 400 m cell size (Lane et al., 2020).2. Total Magnetic Intensity (TMI) Grid of Australia 2019 - seventh edition Enhanced Products Package (Morse, 2020).ProcessingAll processing of the national grids were undertaken using Intrepid software. The following was performed on the input data:1. The grids were reprojected from GDA94 geodetic to Australian Albers (EPSG 3577). 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.3. Various Fast Fourier Transforms (FFT) were applied to each grid (see ‘Grids_for_Machine_Learning_dataset_notes.pdf’). Metadata (all grids)· Datum: GDA94· Projection: Australian Albers (EPSG 3577)· Cell size: 80 m· File format: GeoTiff (.tif) Data is available on request from clientservices@ga.gov.au - Quote eCat# 149130Maintenance and Update Frequency: asNeededStatement: 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.&rft.creator=Miller, R. &rft.creator=Goodwin, J. &rft.creator=Wilford, J. &rft.creator=McInnes, D. &rft.date=2024&rft.coverage=westlimit=112.00; southlimit=-44.00; eastlimit=154.00; northlimit=-9.00&rft.coverage=westlimit=112.00; southlimit=-44.00; eastlimit=154.00; northlimit=-9.00&rft_rights= https://creativecommons.org/licenses/by/4.0/&rft_rights=Creative Commons Attribution 4.0 International Licence&rft_rights=CC-BY&rft_rights=4.0&rft_rights=Any&rft_rights=Any&rft_rights=© Commonwealth of Australia (Geoscience Australia) 2024&rft_rights=Australian Government Security Classification System&rft_rights=https://www.protectivesecurity.gov.au/Pages/default.aspx&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Australian Government Security Classification System&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft_subject=geoscientificInformation&rft_subject=Geophysical Acquisition and Processing Section&rft_subject=machine learning&rft_subject=grids&rft_subject=raster&rft_subject=Total Magnetic Intensity&rft_subject=TMI&rft_subject=gravity&rft_subject=Reduction to Pole&rft_subject=RTP&rft_subject=analytic signal&rft_subject=tilt&rft_subject=phase map&rft_subject=residual&rft_subject=upward continuation&rft_subject=vertical integral&rft_subject=De-trended Global Isostatic Residual&rft_subject=DGIR&rft_subject=Free-Air Anomaly&rft_subject=FAA&rft_subject=Complete Bouguer Anomaly&rft_subject=horizontal derivative&rft_subject=band pass&rft_subject=vertical derivative&rft_subject=Magnetism and palaeomagnetism&rft_subject=Gravimetrics&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data

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Creative Commons Attribution 4.0 International Licence
http://creativecommons.org/licenses/by/4.0

Creative Commons Attribution 4.0 International Licence

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4.0

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Brief description

Purpose

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.

Input Data

The following Australian national datasets were used:

1. 2019 Australian National Gravity Grids: Free Air Anomaly, Complete Bouguer Anomaly, De-trended Global Isostatic Residual, 400 m cell size (Lane et al., 2020).

2. Total Magnetic Intensity (TMI) Grid of Australia 2019 - seventh edition Enhanced Products Package (Morse, 2020).

Processing

All processing of the national grids were undertaken using Intrepid software. The following was performed on the input data:

1. The grids were reprojected from GDA94 geodetic to Australian Albers (EPSG 3577).

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.

3. Various Fast Fourier Transforms (FFT) were applied to each grid (see ‘Grids_for_Machine_Learning_dataset_notes.pdf’).

Metadata (all grids)

· Datum: GDA94

· Projection: Australian Albers (EPSG 3577)

· Cell size: 80 m

· File format: GeoTiff (.tif)

Data is available on request from clientservices@ga.gov.au - Quote eCat# 149130

Lineage

Maintenance and Update Frequency: asNeeded

Statement:

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.

Notes

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.

Created: 01 07 2024

Issued: 08 07 2024

This dataset is part of a larger collection

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text: westlimit=112.00; southlimit=-44.00; eastlimit=154.00; northlimit=-9.00

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Other Information

Download the document (pdf)

uri : https://d28rz98at9flks.cloudfront.net/149130/149130_00_0.pdf External Link

Identifiers

DOI : 10.26186/149130
URI : pid.geoscience.gov.au/dataset/ga/149130
global : 3a953681-9ec4-4f37-a986-b9c0e1b644ea

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