Data

5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied

Geoscience Australia
Geophysical Acquisition & Processing Section
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.26186/150977&rft.title=5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied&rft.identifier=10.26186/150977&rft.publisher=Commonwealth of Australia (Geoscience Australia)&rft.description=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 5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied has a cell size of degrees (approximately 20m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 2024 by the WA Government, and consisted of 415090 line-kilometres of data at 100m line spacing and 50m terrain clearance.Maintenance and Update Frequency: asNeededStatement: This 5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied is an airborne-derived Total Magnetic Intensity (TMI) grid for the Narryer survey. The survey was acquired under the project No. 5028 for the geological survey of WA. The grid has a cell size of degrees (approximately 20m). The units are in nanoTesla (or nT). A total of 415090 line-kilometres of data at a line spacing between 100m and m, and m terrain clearance were acquired to produce this grid. Details of the specifications of individual airborne surveys can be found in the Fourteenth Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). This Index is also available online at http://pid.geoscience.gov.au/dataset/79134. Reference: Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition).&rft.creator=Geophysical Acquisition & Processing Section &rft.date=2026&rft.coverage=westlimit=115.99191161172897; southlimit=-25.861845684704747; eastlimit=116.86334479372128; northlimit=-24.986191997104246; projection=GDA94 (EPSG:4283)&rft.coverage=westlimit=115.99191161172897; southlimit=-25.861845684704747; eastlimit=116.86334479372128; northlimit=-24.986191997104246; projection=GDA94 (EPSG:4283)&rft_rights=Creative Commons Attribution 4.0 International Licence https://creativecommons.org/licenses/by/4.0/&rft_rights=© Commonwealth of Australia (Geoscience Australia) and State of Western Australia (Department of Mines, Industry Regulation and Safety) 2026&rft_rights=Australian Government Security Classification System https://www.protectivesecurity.gov.au/publications-library/policy-8-classification-system&rft_subject=geoscientificInformation&rft_subject=EARTH SCIENCES&rft_subject=NCI&rft_subject=Earth sciences&rft_subject=geophysics&rft_subject=grid&rft_subject=Australia&rft_subject=WA&rft_subject=survey 5028&rft_subject=GADDS2.0&rft_subject=TMI&rft_subject=magnetics&rft_subject=magnetism&rft_subject=palaeomagnetism&rft_subject=airborne digital data&rft_subject=geophysical survey&rft_subject=mag&rft_subject=total magnetic intensity&rft_subject=raster&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data
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Creative Commons Attribution 4.0 International Licence
https://creativecommons.org/licenses/by/4.0/

© Commonwealth of Australia (Geoscience Australia) and State of Western Australia (Department of Mines, Industry Regulation and Safety) 2026

Australian Government Security Classification System
https://www.protectivesecurity.gov.au/publications-library/policy-8-classification-system

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Full description

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 5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied has a cell size of degrees (approximately 20m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 2024 by the WA Government, and consisted of 415090 line-kilometres of data at 100m line spacing and 50m terrain clearance.

Lineage

Maintenance and Update Frequency: asNeeded
Statement: This 5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied is an airborne-derived Total Magnetic Intensity (TMI) grid for the Narryer survey. The survey was acquired under the project No. 5028 for the geological survey of WA. The grid has a cell size of degrees (approximately 20m). The units are in nanoTesla (or nT). A total of 415090 line-kilometres of data at a line spacing between 100m and m, and m terrain clearance were acquired to produce this grid. Details of the specifications of individual airborne surveys can be found in the Fourteenth Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). This Index is also available online at http://pid.geoscience.gov.au/dataset/79134. Reference: Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition).

Notes

Purpose
Magnetic and radiometric data are types of geophysical information primarily used to map geology. The data will have applications in mineral, energy, and groundwater exploration as well as environmental studies.

Issued: 05 05 2026

Data time period: 2026-02-25 to 2026-02-25

This dataset is part of a larger collection

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116.86334,-24.98619 116.86334,-25.86185 115.99191,-25.86185 115.99191,-24.98619 116.86334,-24.98619

116.42762820273,-25.424018840905

text: westlimit=115.99191161172897; southlimit=-25.861845684704747; eastlimit=116.86334479372128; northlimit=-24.986191997104246; projection=GDA94 (EPSG:4283)

Subjects
Australia | EARTH SCIENCES | Earth sciences | GADDS2.0 | NCI | Published_External | TMI | WA | airborne digital data | geophysical survey | geophysics | geoscientificInformation | grid | mag | magnetics | magnetism | palaeomagnetism | raster | survey 5028 | total magnetic intensity |

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Other Information
The Geophysical Archive Data Delivery System (GADDS2) portal provides HTTP download of geophysics datasets in a number of formats. Point and line datasets are available in NetCDF and ASEG-GDF2. Grid datasets are available in NetCDF, GeoTIFF and ERS. (File available for download in various formats from the GADDS2 portal)

url : https://portal.ga.gov.au/persona/gadds

File download for 5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied (5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied file download)

url : https://thredds.nci.org.au/thredds/fileServer/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/airborne_geophysics/WA/grid/P5028/P5028_3_TMI_reduced_grid.nc

NetCDF Subsetting Service (NCSS) for 5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied (5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied NCSS)

url : https://thredds.nci.org.au/thredds/ncss/grid/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/airborne_geophysics/WA/grid/P5028/P5028_3_TMI_reduced_grid.nc/dataset.html

OPeNDAP web service for 5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied (5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied OPeNDAP)

url : https://thredds.nci.org.au/thredds/dodsC/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/airborne_geophysics/WA/grid/P5028/P5028_3_TMI_reduced_grid.nc.html

OGC Web Mapping Service (WMS) for 5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied (5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied WMS)

url : https://thredds.nci.org.au/thredds/wms/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/airborne_geophysics/WA/grid/P5028/P5028_3_TMI_reduced_grid.nc?service=WMS&version=1.3.0&request=GetCapabilities

OGC Web Coverage Service (WCS) for 5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied (5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied WCS)

url : https://thredds.nci.org.au/thredds/wcs/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/airborne_geophysics/WA/grid/P5028/P5028_3_TMI_reduced_grid.nc?service=WCS&version=1.0.0&request=GetCapabilities

5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied NCSS

url : https://thredds.nci.org.au/thredds/ncss/grid/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/airborne_geophysics/WA/grid/P5028/P5028_3_TMI_reduced_grid.nc/dataset.html

5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied OPeNDAP

url : https://thredds.nci.org.au/thredds/dodsC/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/airborne_geophysics/WA/grid/P5028/P5028_3_TMI_reduced_grid.nc.html

5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied WMS

url : https://thredds.nci.org.au/thredds/wms/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/airborne_geophysics/WA/grid/P5028/P5028_3_TMI_reduced_grid.nc?service=WMS&version=1.3.0&request=GetCapabilities

5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with standard reductions applied WCS

url : https://thredds.nci.org.au/thredds/wcs/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/airborne_geophysics/WA/grid/P5028/P5028_3_TMI_reduced_grid.nc?service=WCS&version=1.0.0&request=GetCapabilities

Identifiers
ACN 633 798 857