Spencer - TMI RTP 1VD grid (AWAGS)

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 Spencer - TMI RTP 1VD grid (AWAGS) is the first vertical derivative of the TMI RTP grid of the Spencer Airborne Magnetic Radiometric and DEM survey, SA, 2018 survey.

This grid has a cell size of 0.0004 degrees (approximately 41m) , and given in units of nT per metre (nT/m). The data used to produce the TMI grid was acquired in 2018 by the SA Government, and consisted of 49937 line-kilometres of data at 200m line spacing and 60m terrain clearance. The data has had a variable reduction to the pole applied to centre the magnetic anomaly over the magnetised body. The VRTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-11 geomagnetic reference model using a data representative date and elevation representative of the survey. A first vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the TMI RTP grid of the Spencer Airborne Magnetic Radiometric and DEM survey, SA, 2018 survey to produce this grid. This grid was calculated using an algorithm from the INTREPID Geophysics software package. This grid shows the magnetic response of subsurface features with contrasting magnetic susceptibilities. The grid can also be used to locate structural features such as dykes.

Simple

Identification info

Date (Creation)
2020-10-31T00:00:00
Date (Publication)
2020-10-31T00:00:00
Date (Revision)
2021-07-05T23:36:38
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/144953

Cited responsible party
Role Organisation / Individual Name Details
Author

Geophysical Acquisition & Processing Section
Status
Completed
Point of contact
Role Organisation / Individual Name Details
Point of contact

Commonwealth of Australia (Geoscience Australia)

 Voice
Topic category
  • Geoscientific information

Extent

N
S
E
W


Temporal extent

Time period
2018-06-11T00:00:00 2018-06-11T00:00:00
Maintenance and update frequency
Not planned

Resource format

Title

Product data repository: Various Formats

Website

Data Store directory containing the digital product files

Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes

theme.ANZRC Fields of Research.rdf

  • EARTH SCIENCES

Data centre

  • NCI

Discipline

  • Earth sciences

Discipline

  • geophysics

Feature type

  • grid

Place

  • Australia

Place

  • SA

Project

  • survey 1310

Theme

  • GADDS2.0

Theme

  • TMI

Theme

  • magnetics

Theme

  • magnetism

Theme

  • palaeomagnetism

Theme

  • airborne digital data

Theme

  • geophysical survey

Theme

  • mag

Theme

  • total magnetic intensity

Theme

  • reduced to the pole

Theme

  • RTP

Theme

  • first vertical derivative

Theme

  • 1VD

Theme

  • grid

Theme

  • greyscale

Theme

  • image

Keywords

  • Published_External

Resource constraints

Title

Creative Commons Attribution 4.0 International Licence

Alternate title

CC-BY

Edition

4.0

Website

http://creativecommons.org/licenses/

Access constraints
License
Use constraints
License
Other constraints

(c) Commonwealth of Australia (Geoscience Australia) and Department for Energy and Mining, Government of South Australia 2020

Resource constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

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

Classification
Unclassified

Associated resource

Association Type
Operated on by
Title

Spencer - TMI RTP 1VD grid (AWAGS) NCSS

Website

https://thredds.nci.org.au/thredds/ncss/grid/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/airborne_geophysics/SA/grid/P1310/P1310-grid-tmi_rtp_1vd-AWAGS_MAG_2019.nc/dataset.html

NetCDF Subsetting Service (NCSS) for Spencer - TMI RTP 1VD grid (AWAGS)

Associated resource

Association Type
Operated on by
Title

Spencer - TMI RTP 1VD grid (AWAGS) OPeNDAP

Website

https://thredds.nci.org.au/thredds/dodsC/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/airborne_geophysics/SA/grid/P1310/P1310-grid-tmi_rtp_1vd-AWAGS_MAG_2019.nc.html

OPeNDAP web service for Spencer - TMI RTP 1VD grid (AWAGS)

Associated resource

Association Type
Operated on by
Title

Spencer - TMI RTP 1VD grid (AWAGS) WMS

Website

https://thredds.nci.org.au/thredds/wms/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/airborne_geophysics/SA/grid/P1310/P1310-grid-tmi_rtp_1vd-AWAGS_MAG_2019.nc?service=WMS&version=1.3.0&request=GetCapabilities

OGC Web Mapping Service (WMS) for Spencer - TMI RTP 1VD grid (AWAGS)

Associated resource

Association Type
Operated on by
Title

Spencer - TMI RTP 1VD grid (AWAGS) WCS

Website

https://thredds.nci.org.au/thredds/wcs/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/airborne_geophysics/SA/grid/P1310/P1310-grid-tmi_rtp_1vd-AWAGS_MAG_2019.nc?service=WCS&version=1.0.0&request=GetCapabilities

OGC Web Coverage Service (WCS) for Spencer - TMI RTP 1VD grid (AWAGS)

Language
English
Character encoding
UTF8

Distribution Information

Distributor contact
Role Organisation / Individual Name Details
Distributor

Geoscience Australia

 Voice
OnLine resource

File available for download in various formats from the GADDS2 portal

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.

Distribution format

  • WWW:LINK-1.0-http--link

Distributor contact
Role Organisation / Individual Name Details
Distributor

National Computational Infrastructure

 Voice
OnLine resource

Spencer - TMI RTP 1VD grid (AWAGS) file download

File download for Spencer - TMI RTP 1VD grid (AWAGS)

Distribution format

  • WWW:LINK-1.0-http--link

OnLine resource

Spencer - TMI RTP 1VD grid (AWAGS) NCSS

NetCDF Subsetting Service (NCSS) for Spencer - TMI RTP 1VD grid (AWAGS)

Distribution format

  • NCSS

OnLine resource

Spencer - TMI RTP 1VD grid (AWAGS) OPeNDAP

OPeNDAP web service for Spencer - TMI RTP 1VD grid (AWAGS)

Distribution format

  • WWW:LINK-1.0-http--opendap

OnLine resource

Spencer - TMI RTP 1VD grid (AWAGS) WMS

OGC Web Mapping Service (WMS) for Spencer - TMI RTP 1VD grid (AWAGS)

Distribution format

  • OGC:WMS

OnLine resource

Spencer - TMI RTP 1VD grid (AWAGS) WCS

OGC Web Coverage Service (WCS) for Spencer - TMI RTP 1VD grid (AWAGS)

Distribution format

  • OGC:WCS

Resource lineage

Statement

This Spencer - TMI RTP 1VD grid (AWAGS) is the first vertical derivative grid of an airborne-derived Total Magnetic Intensity (TMI) Reduced to the Pole (RTP) grid for the Spencer Airborne Magnetic Radiometric and DEM survey, SA, 2018 survey. The survey was acquired under the project No. 1310 for the geological survey of SA. A total of 49937 line-kilometres of data at a line spacing of 200m were acquired to produce the TMI grid. The data has had a variable reduction to the pole applied to centre the magnetic anomaly over the magnetised body. The VRTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-11 geomagnetic reference model using a data representative date and elevation representative of the survey. A first vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the TMI RTP grid of the Spencer Airborne Magnetic Radiometric and DEM survey, SA, 2018 survey to produce this grid. This grid was calculated using an algorithm from the INTREPID Geophysics software package. The image shows the magnetic response of subsurface features with contrasting magnetic susceptibilities. The image can also be used to locate structural features such as 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

Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition).

Intrepid Geophysics http://intrepid-geophysics.com

Hierarchy level
Dataset
Description

This Spencer - TMI RTP 1VD grid (AWAGS) is the first vertical derivative grid of an airborne-derived TMI RTP data for the Spencer Airborne Magnetic Radiometric and DEM survey, SA, 2018 survey acquired for the geological survey of SA

Reference System Information

Reference system identifier
EPSG/GDA94 (EPSG:4283)

Metadata constraints

Title

Australian Government Security Classification System

Edition date
2018-11-01T00:00:00
Website

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

Classification
Unclassified

Metadata

Metadata identifier
urn:uuid/258c8894-2329-43ba-92b4-e876c86abaa0

Title

GeoNetwork UUID

Language
English
Character encoding
UTF8
Contact
Role Organisation / Individual Name Details
Point of contact

Commonwealth of Australia (Geoscience Australia)

 Voice
Point of contact

Manager Client Services
Title

Geophysical Data Collection - Airborne Geophysics

Citation identifier
ddeb0fc4-32e3-4913-80f2-f4249b17a925

Citation identifier
111301

Type of resource

Resource scope
Dataset
Name

Spencer - TMI RTP 1VD grid (AWAGS)

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/144953

Metadata linkage

http://rhe-ecat-prod01.prod.lan:8080/geonetwork/srv/eng/search?uuid=258c8894-2329-43ba-92b4-e876c86abaa0

Date info (Creation)
2021-06-17T00:00:00
Date info (Revision)
2021-06-17T00:00:00

Metadata standard

Title

AU/NZS ISO 19115-1:2014

Metadata standard

Title

ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3

Title

Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

Edition

Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

Spatial extent

N
S
E
W


Keywords

1VD Earth sciences GADDS2.0 NCI RTP TMI airborne digital data first vertical derivative geophysical survey geophysics greyscale grid grid image mag magnetics magnetism palaeomagnetism reduced to the pole survey 1310 total magnetic intensity
theme.ANZRC Fields of Research.rdf
EARTH SCIENCES

Provided by

Access to the portal

Associated resources

Not available