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 GSQ Galilee TMI grid geodetic has a cell size of 0.00082 degrees (approximately 88m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 2011 by the QLD Government, and consisted of 125102 line-kilometres of data at 400m line spacing and 80m terrain clearance.
Lineage
Maintenance and Update Frequency: notPlanned
Statement: This GSQ Galilee TMI grid geodetic is an airborne-derived Total Magnetic Intensity (TMI) grid for the Galilee, Qld, 2011 survey. The survey was acquired under the project No. 1247 for the geological survey of QLD. The grid has a cell size of 0.00082 degrees (approximately 88m). The units are in nanoTesla (or nT). A total of 125102 line-kilometres of data at a line spacing of 400m and 80m terrain clearance were acquired to produce this grid. Details of the specifications of individual airborne surveys can be found in the Fourteenth Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). This Index is also available online at http://pid.geoscience.gov.au/dataset/79134.
Reference:
Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition).
Created: 07 03 2020
Issued: 07 03 2020
Modified: 06 07 2021
Data time period: 13 08 2011 to 10 06 2012
text: westlimit=142.9629; southlimit=-23.3726; eastlimit=145.8018; northlimit=-20.9938; projection=GDA94 (EPSG:4283)
Subjects
Australia |
EARTH SCIENCES |
Earth sciences |
GADDS2.0 |
NCI |
Published_External |
QLD |
TMI |
airborne digital data |
geophysical survey |
geophysics |
geoscientificInformation |
grid |
mag |
magnetics |
magnetism |
palaeomagnetism |
raster |
survey 1247 |
total magnetic intensity |
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Other Information
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)
url :
https://portal.ga.gov.au/persona/gadds
File download for GSQ Galilee TMI grid geodetic (GSQ Galilee TMI grid geodetic file download)
NetCDF Subsetting Service (NCSS) for GSQ Galilee TMI grid geodetic (GSQ Galilee TMI grid geodetic NCSS)
OPeNDAP web service for GSQ Galilee TMI grid geodetic (GSQ Galilee TMI grid geodetic OPeNDAP)
OGC Web Mapping Service (WMS) for GSQ Galilee TMI grid geodetic (GSQ Galilee TMI grid geodetic WMS)
OGC Web Coverage Service (WCS) for GSQ Galilee TMI grid geodetic (GSQ Galilee TMI grid geodetic WCS)
GSQ Galilee TMI grid geodetic NCSS
GSQ Galilee TMI grid geodetic OPeNDAP
GSQ Galilee TMI grid geodetic WMS
GSQ Galilee TMI grid geodetic WCS
Identifiers
- URL : pid.geoscience.gov.au/dataset/ga/143677
- global : c7e3b601-070b-4842-8a32-3cf71889397d
