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P902 tmivd1g

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Created 14/01/2025

Updated 14/01/2025

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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 P902 tmivd1g is a first vertical derivative of the Total Magnetic Intensity grid for the SMMSP - AEM - St George, Qld, 2001. This grid has a cell size of 0.00083 degrees (approximately 87m). The grid has units of nanoTesla per km (or nT/km). The data used to produce the TMI grid was acquired in 2001 by the QLD Government, and consisted of 28822 line-kilometres of data at a line spacing between 250m and 400m, and 120m terrain clearance. A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid.

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Title P902 tmivd1g
Language eng
Licence Not Specified
Landing Page https://devweb.dga.links.com.au/data/dataset/910223b4-9cbb-408a-8359-fe1f18eeb0b2
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 26/06/2001 - 22/08/2001
Geospatial Coverage
Map data © OpenStreetMap contributors
Data Portal Data.gov.au