Data

5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) applied.

Geoscience Australia

Geophysical Acquisition & Processing Section

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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=info:doi10.26186/150981&rft.title=5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) applied.&rft.identifier=10.26186/150981&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 Reduction to Pole (RTP) applied. is a first vertical derivative of the Total Magnetic Intensity grid for the Narryer.This grid has a cell size of degrees (approximately 20m). The grid has units of nanoTesla per km (or nT/km). The data used to produce the TMI 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. A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid.Maintenance and Update Frequency: asNeededStatement: This 5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) applied. is a first vertical derivative grid of the Total Magnetic Intensity (TMI) anomaly for the Narryer. The survey was acquired under the project No. 5028 for the geological survey of WA. A total of 415090 line-kilometres of data at a line spacing between 100m and m, and m terrain clearance were acquired to produce the TMI grid. A first vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the Total Magnetic Intensity grid of the Narryer survey to produce this grid. This grid was calculated using an algorithm from the INTREPID Geophysics software package. The processed data are checked by GA geophysicists using standard methods for assessing quality to ensure that the final data are fit-for-purpose. The grid has a cell size of degrees (approximately 20m). The grid has units of nanoTesla per km (or nT/km). The first vertical derivative grid is very helpful for the enhancement of near surface features and structural features such as faults and dykes. 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. References: Intrepid Geophysics, http://www.intrepid-geophysics.com; Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition).&rft.creator=Geophysical Acquisition & Processing Section &rft.date=2026&rft.coverage=westlimit=115.99191161173253; southlimit=-25.861845684704544; eastlimit=116.86334459404108; northlimit=-24.98637259160062; projection=GDA94 (EPSG:4283)&rft.coverage=westlimit=115.99191161173253; southlimit=-25.861845684704544; eastlimit=116.86334459404108; northlimit=-24.98637259160062; 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=magnetics&rft_subject=first vertical derivative&rft_subject=magnetism&rft_subject=palaeomagnetism&rft_subject=airborne digital data&rft_subject=geophysical survey&rft_subject=mag&rft_subject=1vd&rft_subject=raster&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data

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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 Reduction to Pole (RTP) applied. is a first vertical derivative of the Total Magnetic Intensity grid for the Narryer.
This grid has a cell size of degrees (approximately 20m). The grid has units of nanoTesla per km (or nT/km). The data used to produce the TMI 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. A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid.

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Maintenance and Update Frequency: asNeeded

Statement: This 5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) applied. is a first vertical derivative grid of the Total Magnetic Intensity (TMI) anomaly for the Narryer. The survey was acquired under the project No. 5028 for the geological survey of WA. A total of 415090 line-kilometres of data at a line spacing between 100m and m, and m terrain clearance were acquired to produce the TMI grid. A first vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the Total Magnetic Intensity grid of the Narryer survey to produce this grid. This grid was calculated using an algorithm from the INTREPID Geophysics software package. The processed data are checked by GA geophysicists using standard methods for assessing quality to ensure that the final data are fit-for-purpose. The grid has a cell size of degrees (approximately 20m). The grid has units of nanoTesla per km (or nT/km). The first vertical derivative grid is very helpful for the enhancement of near surface features and structural features such as faults and dykes. 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. References: Intrepid Geophysics, http://www.intrepid-geophysics.com; 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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text: westlimit=115.99191161173253; southlimit=-25.861845684704544; eastlimit=116.86334459404108; northlimit=-24.98637259160062; projection=GDA94 (EPSG:4283)

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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 External Link

File download for 5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) applied. (5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) 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_RTP.nc External Link

NetCDF Subsetting Service (NCSS) for 5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) applied. (5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) 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_RTP.nc/dataset.html External Link

OPeNDAP web service for 5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) applied. (5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) 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_RTP.nc.html External Link

OGC Web Mapping Service (WMS) for 5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) applied. (5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) 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_RTP.nc?service=WMS&version=1.3.0&request=GetCapabilities External Link

OGC Web Coverage Service (WCS) for 5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) applied. (5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) 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_RTP.nc?service=WCS&version=1.0.0&request=GetCapabilities External Link

5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) applied. NCSS

5028 Block 3 (Northwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) applied. OPeNDAP