GSNSW Southeast Lachlan TMI Grid Geodetic

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 GSNSW Southeast Lachlan TMI Grid Geodetic has a cell size of 0.0005 degrees (approximately 50m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 2010 by the NSW Government, and consisted of 108251 line-kilometres of data at a line spacing between 250m and 500m, and 60m terrain clearance.

Data and Resources

Map preview

See this dataset in the Digital Twin Victoria

Additional Information

Field Value
Published (Metadata Record) 04/03/2026
Last updated 05/03/2026
Organisation Australian Federal Government
License License Not Specified
Update Frequency Unknown