Authors / CoAuthors
Geophysical Acquisition & Processing Section
Abstract
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;
Product Type
dataset
eCat Id
149163
Contact for the resource
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Point of contact
Resource provider
Digital Object Identifier
Keywords
- theme.ANZRC Fields of Research.rdf
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- EARTH SCIENCES
- ( Data centre )
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- NCI
- ( Discipline )
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- Earth sciences
- ( Discipline )
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- geophysics
- ( Feature type )
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- grid
- ( Place )
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- Australia
- ( Place )
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- NSW
- ( Project )
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- survey 5023
- ( Theme )
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- magnetics
- ( Theme )
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- magnetism
- ( Theme )
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- palaeomagnetism
- ( Theme )
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- total magnetic intensity
- ( Theme )
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- TMI
- ( Theme )
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- reduction to pole
- ( Theme )
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- RTP
- ( Theme )
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- first vertical derivative
- ( Theme )
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- 1VD
- ( Theme )
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- horizontal gradient
- ( Theme )
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- gradiometry
- ( Theme )
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- airborne
- ( Theme )
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- geophysical survey
- ( Theme )
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- grid
- ( Theme )
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- raster
- ( Theme )
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- GADDS
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- Published_External
Publication Date
2024-02-12T01:39:44
Creation Date
2024-02-05T00:00:00
Security Constraints
Legal Constraints
Status
completed
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.
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
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.
Parent Information
Geophysical Data Collection - Airborne Geophysics
UUID - ddeb0fc4-32e3-4913-80f2-f4249b17a925,
eCat ID - 111301
Extents
[-33.126166154269896, -31.75883276099071, 144.78821652548916, 145.78921679836856]
Reference System
GDA2020 (EPSG:7844)
Spatial Resolution
Service Information
Associations
Association Type - operatedOnBy
Yathong Magnetic Gradient and Radiometric Survey, NSW, 2023, (P5023), gradient enhanced total magnetic intensity, reduced to pole, first vertical derivative grid NCSS
Association Type - operatedOnBy
Yathong Magnetic Gradient and Radiometric Survey, NSW, 2023, (P5023), gradient enhanced total magnetic intensity, reduced to pole, first vertical derivative grid OPeNDAP
Association Type - operatedOnBy
Yathong Magnetic Gradient and Radiometric Survey, NSW, 2023, (P5023), gradient enhanced total magnetic intensity, reduced to pole, first vertical derivative grid WMS
Association Type - operatedOnBy
Yathong Magnetic Gradient and Radiometric Survey, NSW, 2023, (P5023), gradient enhanced total magnetic intensity, reduced to pole, first vertical derivative grid WCS
Downloads and Links
File available for download in various formats from the GADDS2 portal
Yathong Magnetic Gradient and Radiometric Survey, NSW, 2023, (P5023), gradient enhanced total magnetic intensity, reduced to pole, first vertical derivative grid file download
Yathong Magnetic Gradient and Radiometric Survey, NSW, 2023, (P5023), gradient enhanced total magnetic intensity, reduced to pole, first vertical derivative grid NCSS
Yathong Magnetic Gradient and Radiometric Survey, NSW, 2023, (P5023), gradient enhanced total magnetic intensity, reduced to pole, first vertical derivative grid OPeNDAP
Yathong Magnetic Gradient and Radiometric Survey, NSW, 2023, (P5023), gradient enhanced total magnetic intensity, reduced to pole, first vertical derivative grid WMS
Yathong Magnetic Gradient and Radiometric Survey, NSW, 2023, (P5023), gradient enhanced total magnetic intensity, reduced to pole, first vertical derivative grid WCS
Source Information