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 Arafura Sea magnetic grid geodetic has a cell size of 0.00417 degrees (approximately 459m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 1988 by the NT Government, and consisted of 31761 line-kilometres of data at a line spacing between 2000m and 4000m, and 300m terrain clearance.
Lineage
Maintenance and Update Frequency: notPlanned
Statement: This Arafura Sea magnetic grid geodetic is an airborne-derived Total Magnetic Intensity (TMI) grid for the Arafura Sea, NT, 1988 survey. The survey was acquired under the project No. 560 for the geological survey of NT. The grid has a cell size of 0.00417 degrees (approximately 459m). The units are in nanoTesla (or nT). A total of 31761 line-kilometres of data at a line spacing between 2000m and 4000m, and 300m 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: 23 09 1988 to 10 11 1988
text: westlimit=129.6967; southlimit=-11.2636; eastlimit=133.5467; northlimit=-9.0095; projection=AGD66 (EPSG:4202)
Subjects
Australia |
EARTH SCIENCES |
Earth sciences |
GADDS2.0 |
NCI |
NT |
Published_External |
TMI |
airborne digital data |
geophysical survey |
geophysics |
geoscientificInformation |
grid |
mag |
magnetics |
magnetism |
palaeomagnetism |
raster |
survey 560 |
total magnetic intensity |
User Contributed Tags
Login to tag this record with meaningful keywords to make it easier to discover
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 Arafura Sea magnetic grid geodetic (Arafura Sea magnetic grid geodetic file download)
NetCDF Subsetting Service (NCSS) for Arafura Sea magnetic grid geodetic (Arafura Sea magnetic grid geodetic NCSS)
OPeNDAP web service for Arafura Sea magnetic grid geodetic (Arafura Sea magnetic grid geodetic OPeNDAP)
OGC Web Mapping Service (WMS) for Arafura Sea magnetic grid geodetic (Arafura Sea magnetic grid geodetic WMS)
OGC Web Coverage Service (WCS) for Arafura Sea magnetic grid geodetic (Arafura Sea magnetic grid geodetic WCS)
Arafura Sea magnetic grid geodetic NCSS
Arafura Sea magnetic grid geodetic OPeNDAP
Arafura Sea magnetic grid geodetic WMS
Arafura Sea magnetic grid geodetic WCS
Identifiers
- URL : pid.geoscience.gov.au/dataset/ga/140978
- global : 0f982601-122e-4837-8449-97e2fc94943b
