Data

Yathong Magnetic Gradient and Radiometric Survey, NSW, 2023, (P5023), gradient enhanced total magnetic intensity, reduced to pole, first vertical derivative grid

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:doi10.26186/149163&rft.title=Yathong Magnetic Gradient and Radiometric Survey, NSW, 2023, (P5023), gradient enhanced total magnetic intensity, reduced to pole, first vertical derivative grid&rft.identifier=https://dx.doi.org/10.26186/149163&rft.publisher=Commonwealth of Australia (Geoscience Australia)&rft.description=TOTAL MAGNETIC INTENSITY Total Magnetic Intensity (TMI) data measures variations in the intensity of the Earth's magnetic field, which includes the fields associated with the Earth's core and the magnetism of rocks in the Earth's crust. The data are 'reduced' to highlight those variations caused by the geology in the Earth's crust. TMI data can be used to interpret sub-surface geological structure and has applications in mineral, energy and groundwater studies. GRADIENT ENHANCED GRID The data for this grid were acquired as part of a horizontal magnetic gradient survey, which uses three alkali-vapour magnetometers to measure longitudinal and transverse gradients. These gradients allow for a 'gradient enhanced' grid of the TMI data to be produced with improved near-surface information and reduced noise (such as that arising from diurnal changes in the magnetic field). REDUCTION TO POLE A Reduction to Pole (RTP) is applied to this grid to locate anomalies above the causative bodies, removing asymmetry caused by the inclination of the Earth's magnetic field. An RTP assumes that the anomalies are caused by induced magnetism (and remanent magnetism is not significant). FIRST VERTICAL DERIVATIVE A First Vertical Derivative (1VD) is applied to this grid which enhances the short-wavelength component of the field. GRID METADATA Units: Nanotesla per metre (nT/m); Cell size: 40 m ( degrees); Datum: EPSG:7844 Processing: Gradient enhanced + RTP + 1VD. LINE METADATA Line spacing: 200 m; Line direction: 90 degrees; Total line-kilometres: 65504 km; Nominal flying height (above ground level): 80 m; Acquisition Start Date: 2023-05-21; Acquisition End Date: 2023-09-14;Maintenance and Update Frequency: notPlannedStatement: This Gradient-Enhanced, Total Magnetic Intensity (TMI), Reduced to Pole (RTP), First Vertical Derivative (1VD) grid from the 5023 Yathong airborne magnetic gradient and radiometric survey, 2023 survey was produced by MAGSPEC Airborne Surveys Pty Ltd for Geological Survey of New South Wales (GSNSW). Quality control and project management were performed by the Geophysical Acquisition and Processing Section at Geoscience Australia.&rft.creator=Geophysical Acquisition & Processing Section &rft.date=2024&rft.coverage=westlimit=144.78819881115587; southlimit=-33.126026141119986; eastlimit=145.78917068024447; northlimit=-31.758830137947406; projection=GDA2020 (EPSG:7844)&rft.coverage=westlimit=144.78819881115587; southlimit=-33.126026141119986; eastlimit=145.78917068024447; northlimit=-31.758830137947406; projection=GDA2020 (EPSG:7844)&rft_rights=&rft_rights=Creative Commons Attribution 4.0 International Licence&rft_rights=CC-BY&rft_rights=4.0&rft_rights=http://creativecommons.org/licenses/&rft_rights=Commonwealth of Australia (Geoscience Australia) and State of New South Wales (Department of Regional New South Wales)&rft_rights=Australian Government Security ClassificationSystem&rft_rights=https://www.protectivesecurity.gov.au/Pages/default.aspx&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&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=NSW&rft_subject=survey 5023&rft_subject=magnetics&rft_subject=magnetism&rft_subject=palaeomagnetism&rft_subject=total magnetic intensity&rft_subject=TMI&rft_subject=reduction to pole&rft_subject=RTP&rft_subject=first vertical derivative&rft_subject=1VD&rft_subject=horizontal gradient&rft_subject=gradiometry&rft_subject=airborne&rft_subject=geophysical survey&rft_subject=raster&rft_subject=GADDS&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data
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Creative Commons Attribution 4.0 International Licence
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CC-BY

4.0

http://creativecommons.org/licenses/

Commonwealth of Australia (Geoscience Australia) and State of New South Wales (Department of Regional New South Wales)

Australian Government Security ClassificationSystem

https://www.protectivesecurity.gov.au/Pages/default.aspx

WWW:LINK-1.0-http--link

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Contact Information

clientservices@ga.gov.au

Brief description

TOTAL MAGNETIC INTENSITY
Total Magnetic Intensity (TMI) data measures variations in the intensity of the Earth's magnetic field, which includes the fields associated with the Earth's core and the magnetism of rocks in the Earth's crust. The data are 'reduced' to highlight those variations caused by the geology in the Earth's crust. TMI data can be used to interpret sub-surface geological structure and has applications in mineral, energy and groundwater studies.

GRADIENT ENHANCED GRID
The data for this grid were acquired as part of a horizontal magnetic gradient survey, which uses three alkali-vapour magnetometers to measure longitudinal and transverse gradients. These gradients allow for a 'gradient enhanced' grid of the TMI data to be produced with improved near-surface information and reduced noise (such as that arising from diurnal changes in the magnetic field).

REDUCTION TO POLE
A Reduction to Pole (RTP) is applied to this grid to locate anomalies above the causative bodies, removing asymmetry caused by the inclination of the Earth's magnetic field. An RTP assumes that the anomalies are caused by induced magnetism (and remanent magnetism is not significant).
FIRST VERTICAL DERIVATIVE
A First Vertical Derivative (1VD) is applied to this grid which enhances the short-wavelength component of the field.

GRID METADATA
Units: Nanotesla per metre (nT/m);
Cell size: 40 m ( degrees);
Datum: EPSG:7844
Processing: Gradient enhanced + RTP + 1VD.

LINE METADATA
Line spacing: 200 m;
Line direction: 90 degrees;
Total line-kilometres: 65504 km;
Nominal flying height (above ground level): 80 m;
Acquisition Start Date: 2023-05-21;
Acquisition End Date: 2023-09-14;

Lineage

Maintenance and Update Frequency: notPlanned
Statement: This Gradient-Enhanced, Total Magnetic Intensity (TMI), Reduced to Pole (RTP), First Vertical Derivative (1VD) grid from the 5023 Yathong airborne magnetic gradient and radiometric survey, 2023 survey was produced by MAGSPEC Airborne Surveys Pty Ltd for Geological Survey of New South Wales (GSNSW). Quality control and project management were performed by the Geophysical Acquisition and Processing Section at Geoscience Australia.

Notes

Purpose
The data were acquired in collaboration with the Geological Survey of New South Wales (GSNSW) to provide high-resolution geological information across ~11,400 km2 of central NSW. The data has applications in mineral exploration (including critical minerals), groundwater, hydrogen, and soil mapping studies.

Created: 05 02 2024

Issued: 12 02 2024

Data time period: 21 05 2023 to 14 09 2023

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145.78917,-31.75883 145.78917,-33.12603 144.7882,-33.12603 144.7882,-31.75883 145.78917,-31.75883

145.2886847457,-32.442428139534

text: westlimit=144.78819881115587; southlimit=-33.126026141119986; eastlimit=145.78917068024447; northlimit=-31.758830137947406; projection=GDA2020 (EPSG:7844)

Subjects
1VD | Australia | EARTH SCIENCES | Earth sciences | GADDS | NCI | NSW | Published_External | RTP | TMI | airborne | first vertical derivative | geophysical survey | geophysics | geoscientificInformation | gradiometry | grid | horizontal gradient | magnetics | magnetism | palaeomagnetism | raster | reduction to pole | survey 5023 | 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)

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

Identifiers
  • global : bde30556-0f71-44e6-ab51-04cb4a3eda3b
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