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GSQ Drummond Galilee Qld magnetic vd1 grid geodetic

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Created 13/01/2025

Updated 13/01/2025

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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 GSQ Drummond Galilee Qld magnetic vd1 grid geodetic is a first vertical derivative of the Total Magnetic Intensity grid for the Drummond & Galilee Qld, (Geomap 2005) GDI 1997/1998. This grid has a cell size of 0.00096 degrees (approximately 103m). The grid has units of nanoTesla per km (or nT/km). The data used to produce the TMI grid was acquired in 1997 by the QLD Government, and consisted of 198262 line-kilometres of data at 400m line spacing and 80m 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 GSQ Drummond Galilee Qld magnetic vd1 grid geodetic
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/92ff7e2d-8bbb-45d3-bf13-cc0e4d9031b5
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 30/04/1997 - 14/09/1997
Geospatial Coverage {"type": "Polygon", "coordinates": [[[144.066, -23.7456], [147.6813, -23.7456], [147.6813, -19.968], [144.066, -19.968], [144.066, -23.7456]]]}
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