Authors / CoAuthors
Geophysical Acquisition & Processing Section
Abstract
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 magnetic grid has a cell size of 0.0004 degrees (approximately 41m).The data are in nanoTesla (or nT). The data used to produce this grid was acquired in 2017 by the SA Government, and consisted of 83653 line-kilometres of data at 200m line spacing and 60m terrain clearance. The data has had a variable reduction to the pole applied to centre the magnetic anomaly over the magnetised body. The VRTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-11 geomagnetic reference model using a data representative date and elevation representative of the survey.
Product Type
dataset
eCat Id
143511
Contact for the resource
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
- theme.ANZRC Fields of Research.rdf
-
- EARTH SCIENCES
- ( Data centre )
-
- NCI
- ( Discipline )
-
- Earth sciences
- ( Discipline )
-
- geophysics
- ( Feature type )
-
- grid
- ( Place )
-
- Australia
- ( Place )
-
- SA
- ( Project )
-
- survey 1283
- ( Theme )
-
- GADDS2.0
- ( Theme )
-
- TMI
- ( Theme )
-
- RTP
- ( Theme )
-
- magnetics
- ( Theme )
-
- magnetism
- ( Theme )
-
- palaeomagnetism
- ( Theme )
-
- airborne digital data
- ( Theme )
-
- geophysical survey
- ( Theme )
-
- mag
- ( Theme )
-
- total magnetic intensity
- ( Theme )
-
- reduced to the pole
- ( Theme )
-
- grid
- ( Theme )
-
- raster
-
- Published_External
Publication Date
2020-03-07T00:00:00
Creation Date
2020-03-07T00:00:00
Security Constraints
Legal Constraints
Status
completed
Purpose
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
This GSSA Torrens ReducedToPole grid geodetic is an airborne-derived Total Magnetic Intensity (TMI) Reduced to the Pole (RTP) grid for the Torrens Airborne Magnetic Radiometric and DEM Survey, SA, 2017. The survey was acquired under the project No. 1283 for the geological survey of SA. The grid has a cell size of 0.0004 degrees (approximately 41m). The data are in nanoTesla (or nT). A total of 83653 line-kilometres of data at a line spacing of 200m and 60m terrain clearance were acquired to produce this grid. The data has had a variable reduction to the pole applied to centre the magnetic anomaly over the magnetised body. The VRTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-11 geomagnetic reference model using a data representative date and elevation representative of the survey. 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).
Parent Information
Geophysical Data Collection - Airborne Geophysics
UUID - ddeb0fc4-32e3-4913-80f2-f4249b17a925,
eCat ID - 111301
Extents
[-32.0417, -30.9654, 136.4566, 138.0597]
Reference System
GDA94 (EPSG:4283)
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information
This GSSA Torrens ReducedToPole grid geodetic includes airborne-derived TMI RTP data for the Torrens Airborne Magnetic Radiometric and DEM Survey, SA, 2017 acquired for the geological survey of SA