From data.gov.au
JSON RDF ISO19115-3 XML

Total Magnetic Intensity (TMI) Grid of Australia with Variable Reduction to Pole (VRTP) 2019 - seventh edition

ARCHIVED

Created 20/01/2025

Updated 20/01/2025

JSON RDF ISO19115-3 XML

Total magnetic intensity (TMI) data measures variations in the intensity of the Earth 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. A variable reduction to Pole is aimed at locating magnetic anomalies exactly above their source bodies and without any distortion. The 2019 Total magnetic Intensity (TMI) grid of Australia with variable reduction to pole (VRTP) 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. 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 of January 2005 and elevation 300 m.

Files and APIs

Tags

Additional Info

Field Value
Title Total Magnetic Intensity (TMI) Grid of Australia with Variable Reduction to Pole (VRTP) 2019 - seventh edition
Language English
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/4aae48f7-cac6-45e8-b1d7-ed719113b3a9
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage {"type": "Polygon", "coordinates": [[[112.502532, -43.927315], [154.661682, -43.927315], [154.661682, -9.025662], [112.502532, -9.025662], [112.502532, -43.927315]]]}
Data Portal data.gov.au