Full description
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 GSV Ballarat Vic magnetic grid geodetic has a cell size of 0.0005 degrees (approximately 49m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 1986 by the VIC Government, and consisted of 11552 line-kilometres of data at 200m line spacing and 70m terrain clearance.
Lineage
Maintenance and Update Frequency: notPlannedCreated: 07 03 2020
Issued: 07 03 2020
Modified: 05 07 2021
Data time period: 30 06 1986 to 07 1986
text: westlimit=143.3085; southlimit=-38.0105; eastlimit=144.0336; northlimit=-37.3321; projection=AGD66 (EPSG:4202)
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The Geophysical Archive Data Delivery System (GADDS2) portal provides HTTP download of geophysics datasets in a number of formats. Point and line datasets are available in NetCDF and ASEG-GDF2. Grid datasets are available in NetCDF, GeoTIFF and ERS. (File available for download in various formats from the GADDS2 portal)
uri :
https://portal.ga.gov.au/persona/gadds
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- Local : pid.geoscience.gov.au/dataset/ga/143826
- global : 16e24a82-9246-44e5-969c-11dea755e9ff