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.These line dataset from the Everard, Giles, SA, 1982 survey were acquired in 1982 by the SA Government, and consisted of 31407 line-kilometres of data at a line spacing between 750m and 750m, and 150m terrain clearance. To constrain long wavelengths in the data, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey data. This survey data is essentially levelled to AWAGS.
Lineage
Maintenance and Update Frequency: notPlanned
Statement: This Everard, Giles, SA, 1982 (P593), magnetic line data, AWAGS levelled is an airborne-derived magnetic line dataset for the Everard, Giles, SA, 1982 survey. The data was acquired under the project No. 593 for the geological survey of SA. A total of 31407 line-kilometres of data at a line spacing between 750m and 1500m, and 150m terrain clearance were acquired during this survey. To constrain long wavelengths in the data, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey data (Milligan et al., 2009). This survey data is essentially levelled to AWAGS. 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.
References:
Milligan, P.R., Minty, B.R.S., Richardson, M. & Franklin, R., 2009. The Australia-wide Airborne Geophysical Survey accurate continental magnetic coverage. Preview, No. 138, p. 1-128,
Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition).
Created: 15 12 2019
Issued: 15 12 2019
Modified: 06 07 2021
Data time period: 12 05 1982 to 24 07 1982
text: westlimit=131.7918; southlimit=-29.1314; eastlimit=134.3256; northlimit=-27.1481; projection=GDA94 (EPSG:4283)
Subjects
AWAGS |
Australia |
EARTH SCIENCES |
Earth sciences |
GADDS2.0 |
Published_External |
SA |
airborne digital data |
geophysical survey |
geophysics |
geoscientificInformation |
line |
magnetic |
magnetics |
magnetism and palaeomagnetism |
survey 593 |
vector |
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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 Everard, Giles, SA, 1982 (P593), magnetic line data, AWAGS levelled (Everard, Giles, SA, 1982 (P593), magnetic line data, AWAGS levelled file download)
OPeNDAP web service for Everard, Giles, SA, 1982 (P593), magnetic line data, AWAGS levelled (Everard, Giles, SA, 1982 (P593), magnetic line data, AWAGS levelled OPeNDAP)
Everard, Giles, SA, 1982 (P593), magnetic line data, AWAGS levelled OPeNDAP
Identifiers
- URL : pid.geoscience.gov.au/dataset/ga/140865
- global : 51a54f29-d71c-40dc-9e17-e8874d229f58
