Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - TMI RTP 0.5VD grid

This layer is a half vertical derivative of the Total Magnetic Intensity grid for the Magnetic Anomaly Map of Australia, Seventh Edition, 2019. The 2019 Total magnetic Intensity (TMI) grid of Australia has a grid cell size of ~3 seconds of arc (approximately 80 m). This grid only includes airborne-derived TMI data for onshore and near-offshore continental areas.

Since the sixth edition was released in 2015, data from 234 new surveys have been added to the database, acquired mainly by the State and Territory Geological Surveys. The new grid was derived from a 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), which serves as a baseline to constrain long wavelengths in the final grid. It is estimated that 33 500 000 line-kilometres of survey data were acquired to produce the 2019 grid data, about 2 000 000 line-kilometres more than for the previous edition. The grid has units of nanoTesla per km (or nT/km). The RTP 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 Fast Fourier Transform (FFT) process was applied to the original grid to calculate the half vertical derivative grid.

Simple

Status
Point of contact
Role Organisation Electronic mail address
Point of contact

Geoscience Australia

clientservices@ga.gov.au

Spatial representation type
Topic category
  • Geoscientific information

Extent

Extent

N
S
E
W




Maintenance and update frequency
As needed
Theme

  • magnetics

  • grid

  • geophysics

  • Australia

Place

  • World

Australian and New Zealand Standard Research Classification (ANZSRC): Fields of Research

  • Earth Sciences

Resource constraints

Use limitation

https://creativecommons.org/licenses/by/4.0

Access constraints
Licence Unrestricted
Use constraints
Licence Unrestricted
Language
English
Character encoding
UTF8
OnLine resource

geophys:magmap_v7_2019_VRTP_05VD

Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - TMI RTP 0.5VD grid

Hierarchy level
Dataset
Reference system identifier
EPSG:4283

Reference system identifier
CRS:84

Metadata

Metadata identifier
urn:uuid/28f9b394f90442ebd10f5a0260290faef6085803

Language
English
Character encoding
anyValidURI
Contact
Role Organisation Electronic mail address
Point of contact

Geoscience Australia

clientservices@ga.gov.au

Point of contact

Type of resource

Resource type
Dataset
Metadata linkage

https://portal.auscope.org.au/geonetwork/srv/api/records/28f9b394f90442ebd10f5a0260290faef6085803

Date info (Revision)
2026-10-20T02:41:31.457965Z
Date info (Creation)
2026-10-24T00:01:41

Metadata standard

Title

ISO 19115-3

 
 

Overviews

Spatial extent

Keywords

Australia geophysics grid magnetics
Australian and New Zealand Standard Research Classification (ANZSRC): Fields of Research

Earth Sciences


Provided by

Access to the catalogue