Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid

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 magnetic grid has a cell size of 0.00083 degrees (approximately 88m).The data are in nanoTesla per metre (or nT/m). To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid. This survey grid is essentially levelled to AWAGS. 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-15 geomagnetic reference model using a data representative date and elevation representative of the survey. A further enhancement has been completed to enhance the geological interpretation of the data.

Identification info

Date (Creation): 2020-11-03T00:00:00

Date (Publication): 2020-11-03T00:00:00

Date (Revision): 2021-07-05T05:27:44

Citation identifier: Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/144748

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

Temporal extent

Time period: 2019-01-01T00:00:00 2019-12-31T00:00:00

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

Discipline

Earth sciences

Discipline

geophysics

Feature type

grid

Place

Australia

Place

None

Project

survey 1324

Theme

GADDS2.0

Theme

AWAGS

Theme

magnetics

Theme

magnetism

Theme

palaeomagnetism

Theme

airborne digital data

Theme

national

Theme

geophysical survey

Theme

total magnetic intensity

Theme

reduced to the pole

Theme

grid

Theme

raster

Theme

pseudo-gravity transformation

Theme

total horizontal derivative filter

Theme

pseudo susceptibility

Theme

tilt angle

Theme

total horizontal gradient

Theme

variable vertical gradient of TMI vertical component

Theme

VBzz

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) 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: Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid NCSS

Website

https://thredds.nci.org.au/thredds/ncss/grid/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/national_geophysical_compilations/Magmap2019/Magmap2019-grid-tmi_rtp_enhancement-PGrav-AWAGS_MAG_2019.nc/dataset.html

NetCDF Subsetting Service (NCSS) for Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid

Associated resource

Association Type: Operated on by

Title: Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid OPeNDAP

Website

https://thredds.nci.org.au/thredds/dodsC/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/national_geophysical_compilations/Magmap2019/Magmap2019-grid-tmi_rtp_enhancement-PGrav-AWAGS_MAG_2019.nc.html

OPeNDAP web service for Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid

Associated resource

Association Type: Operated on by

Title: Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid WMS

Website

https://thredds.nci.org.au/thredds/wms/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/national_geophysical_compilations/Magmap2019/Magmap2019-grid-tmi_rtp_enhancement-PGrav-AWAGS_MAG_2019.nc?service=WMS&version=1.3.0&request=GetCapabilities

OGC Web Mapping Service (WMS) for Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid

Associated resource

Association Type: Operated on by

Title: Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid WCS

Website

https://thredds.nci.org.au/thredds/wcs/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/national_geophysical_compilations/Magmap2019/Magmap2019-grid-tmi_rtp_enhancement-PGrav-AWAGS_MAG_2019.nc?service=WCS&version=1.0.0&request=GetCapabilities

OGC Web Coverage Service (WCS) for Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid

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: Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid file download

File download for Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid

Distribution format

WWW:LINK-1.0-http--link

OnLine resource: Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid NCSS

NetCDF Subsetting Service (NCSS) for Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid

Distribution format

NCSS

OnLine resource: Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid OPeNDAP

OPeNDAP web service for Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid

Distribution format

WWW:LINK-1.0-http--opendap

OnLine resource: Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid WMS

OGC Web Mapping Service (WMS) for Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid

Distribution format

OGC:WMS

OnLine resource: Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid WCS

OGC Web Coverage Service (WCS) for Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid

Distribution format

OGC:WCS

Resource lineage

Statement

This Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid is an airborne-derived Total Magnetic Intensity (TMI) Reduced to the Pole (RTP) enhanced grid for the Magnetic Anomaly Map of Australia, Seventh Edition, 2019 (Poudjom Djomani et al., 2019). The survey was acquired under the project No. 1324. The 2019 magnetic grid was derived from a complete re-levelling of the national magnetic grid database. The survey grids were levelled to each other, and to the Australia Wide Airborne Geophysical Survey (AWAGS) (Milligan et al., 2009), which serves as a baseline to constrain long wavelengths in the final grid. The levelling and grid-merging procedure was described in detail in Minty et al. (2003). The grid has a cell size of 0.00083 degrees (approximately 88m). The data are in nanoTesla per metre (or nT/m). 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-15 geomagnetic reference model using a data representative date and elevation representative of the survey. A further enhancement has been completed to enhance the geological interpretation of the data. 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:

Milligan, P.R., Minty, B.R.S., Richardson, M. & Franklin, R., 2009. The Australia-wide Airborne Geophysical Survey accurate continental magnetic coverage. Preview, No. 138, p. 1-128;

Minty, B.R.S., Milligan, P.R., Luyendyk, A.P.J. and Mackey, T., 2003. Merging airborne magnetic surveys into continental-scale compilations. Geophysics, 68 (3), 988-995;

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

Poudjom Djomani, Y., Minty, B.R.S., Hutchens, M., Lane, R.J.L. 2019, Total Magnetic Intensity (TMI) Grid of Australia 2019 - seventh edition - 80 m cell size. Geoscience Australia, Canberra. http://dx.doi.org/10.26186/5e9cf3f2c0f1d, eCat record number 131505.

Hierarchy level: Dataset

Description: This Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid includes airborne-derived TMI RTP enhanced data for the Magnetic Anomaly Map of Australia, Seventh Edition, 2019.

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/c2b1a30c-cd12-4ca3-965b-f0156cfe1324

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: Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - pseudogravity grid

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier: eCatId/144748

Metadata linkage

http://rhe-ecat-prod01.prod.lan:8080/geonetwork/srv/eng/search?uuid=c2b1a30c-cd12-4ca3-965b-f0156cfe1324

Date info (Creation): 2021-06-16T00:00:00

Date info (Revision): 2021-06-16T00:00:00

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

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Read here the full details and access to the data.

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