Data

Total Magnetic Intensity (TMI) grid of Denmark, WA, 1999 survey

Geoscience Australia
Geophysical Acquisition & Processing Section
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=http://pid.geoscience.gov.au/dataset/ga/105744&rft.title=Total Magnetic Intensity (TMI) grid of Denmark, WA, 1999 survey&rft.identifier=http://pid.geoscience.gov.au/dataset/ga/105744&rft.publisher=Commonwealth of Australia (Geoscience Australia)&rft.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 magnetic grid has a cell size of 0.0006 degrees (approximately 60m). The data used to produce this grid was acquired in 1999 by the WA Government, and consisted of 19930 line-kilometres of data at 300m line spacing and 70m terrain clearance.This mWA1117.nc grid is an airborne-derived Total Magnetic Intensity (TMI) grid for the Denmark, WA, 1999 survey. The survey was acquired under the project No. 1117 for the geological survey of WA. The grid has a cell size of 0.0006 degrees (approximately 60m). A total of 19930 line-kilometres of data at a line spacing of 300m were acquired to produce this grid. To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid (Milligan et al., 2009). This survey grid 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. Further up to date information about individual surveys can also be obtained online from the Airborne Surveys Database at http://www.ga.gov.au/oracle/argus/. The original grid was converted from ERMapper (.ers) format to netCDF4_classic format using GDAL1.11.1. The main purpose of this conversion is to enable access to the data by relevant open source tools and software. The netCDF grid was created on 2016-08-29T10:51:42, 2013-05-03T00:00:00 and has its y-axis indexed Southward-positive. 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).&rft.creator=Geophysical Acquisition & Processing Section &rft.date=2011&rft.coverage=northlimit=-34.268077; southlimit=-35.058877; westlimit=116.850020; eastLimit=118.181420&rft.coverage=northlimit=-34.268077; southlimit=-35.058877; westlimit=116.850020; eastLimit=118.181420&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft_subject=geoscientificInformation&rft_subject=TMI&rft_subject=magnetics&rft_subject=magnetism and palaeomagnetism&rft_subject=airborne digital data&rft_subject=geophysical survey&rft_subject=survey 1117&rft_subject=AWAGS&rft_subject=NCI&rft_subject=Earth sciences&rft_subject=geophysics&rft_subject=grid&rft_subject=Australia&rft_subject=WA&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data

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Creative Commons Attribution 4.0 International Licence
http://creativecommons.org/licenses/by/4.0

Access:

Open

Contact Information

clientservices@ga.gov.au

Brief 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 magnetic grid has a cell size of 0.0006 degrees (approximately 60m). The data used to produce this grid was acquired in 1999 by the WA Government, and consisted of 19930 line-kilometres of data at 300m line spacing and 70m terrain clearance.

Lineage

This mWA1117.nc grid is an airborne-derived Total Magnetic Intensity (TMI) grid for the Denmark, WA, 1999 survey. The survey was acquired under the project No. 1117 for the geological survey of WA. The grid has a cell size of 0.0006 degrees (approximately 60m). A total of 19930 line-kilometres of data at a line spacing of 300m were acquired to produce this grid. To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid (Milligan et al., 2009). This survey grid 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. Further up to date information about individual surveys can also be obtained online from the Airborne Surveys Database at http://www.ga.gov.au/oracle/argus/.
The original grid was converted from ERMapper (.ers) format to netCDF4_classic format using GDAL1.11.1. The main purpose of this conversion is to enable access to the data by relevant open source tools and software. The netCDF grid was created on 2016-08-29T10:51:42, 2013-05-03T00:00:00 and has its y-axis indexed Southward-positive.
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).

Issued: 2011

Data time period: 1998-12-01 to 1999-01-31

118.18142,-34.268077 118.18142,-35.058877 116.85002,-35.058877 116.85002,-34.268077 118.18142,-34.268077

117.51572,-34.663477

text: northlimit=-34.268077; southlimit=-35.058877; westlimit=116.850020; eastLimit=118.181420

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Other Information
Digital Object Identifier for dataset a58c065d-7866-45ef-8f3d-fcc28fde76df

doi : http://dx.doi.org/10.4225/25/589c636bcbc45

Fully qualified pathname of NetCDF file on NCI filesystem for dataset a58c065d-7866-45ef-8f3d-fcc28fde76df. Users must be logged onto the NCI network to access this file system. (md5sum=d72ccd06141e5f3f5b44ac6e960ee0e9) (NetCDF file on NCI filesystem for dataset a58c065d-7866-45ef-8f3d-fcc28fde76df)

local : file:///g/data1/rr2/airborne_geophysics/WA/P1117/magnetics/grid/mWA1117/mWA1117.nc

THREDDS catalog page for dataset a58c065d-7866-45ef-8f3d-fcc28fde76df

uri : http://dapds00.nci.org.au/thredds/catalog/rr2/airborne_geophysics/WA/P1117/magnetics/grid/mWA1117/catalog.html

URI : http://dapds00.nci.org.au/thredds/catalog/rr2/airborne_geophysics/WA/P1117/magnetics/grid/mWA1117/catalog.html?dataset=rr2-Airborne/WA/P1117/magnetics/grid/mWA1117/mWA1117.nc

NetCDF Subset Service for dataset a58c065d-7866-45ef-8f3d-fcc28fde76df (NCSS for dataset a58c065d-7866-45ef-8f3d-fcc28fde76df)

uri : http://dapds00.nci.org.au/thredds/catalog.html

URI : http://dapds00.nci.org.au/thredds/ncss/rr2/airborne_geophysics/WA/P1117/magnetics/grid/mWA1117/mWA1117.nc/dataset.html

NetCDF file download via HTTP for dataset a58c065d-7866-45ef-8f3d-fcc28fde76df

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URI : http://dapds00.nci.org.au/thredds/fileServer/rr2/airborne_geophysics/WA/P1117/magnetics/grid/mWA1117/mWA1117.nc

Zipped ERS file download via HTTP for dataset a58c065d-7866-45ef-8f3d-fcc28fde76df

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URI : http://dapds00.nci.org.au/thredds/fileServer/rr2/airborne_geophysics/http/WA/P1117/magnetics/grid/mWA1117/mWA1117.ers.zip

OPeNDAP landing page for dataset a58c065d-7866-45ef-8f3d-fcc28fde76df (OPeNDAP service for dataset a58c065d-7866-45ef-8f3d-fcc28fde76df)

uri : http://dapds00.nci.org.au/thredds/catalog.html

URI : http://dapds00.nci.org.au/thredds/dodsC/rr2/airborne_geophysics/WA/P1117/magnetics/grid/mWA1117/mWA1117.nc.html

OGC Web Coverage Service for dataset a58c065d-7866-45ef-8f3d-fcc28fde76df (WCS for dataset a58c065d-7866-45ef-8f3d-fcc28fde76df)

uri : http://dapds00.nci.org.au/thredds/catalog.html

URI : http://dapds00.nci.org.au/thredds/wcs/rr2/airborne_geophysics/WA/P1117/magnetics/grid/mWA1117/mWA1117.nc

OGC Web Mapping Service for dataset a58c065d-7866-45ef-8f3d-fcc28fde76df (WMS for dataset a58c065d-7866-45ef-8f3d-fcc28fde76df)

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URI : http://dapds00.nci.org.au/thredds/wms/rr2/airborne_geophysics/WA/P1117/magnetics/grid/mWA1117/mWA1117.nc

Download from Geoscience Australia Geophysical Archive Data Delivery System (Australian Geophysical Archive Data Delivery System)

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URI : http://www.geoscience.gov.au/cgi-bin/mapserv?map=/nas/web/ops/prod/apps/mapserver/gadds/wms_map/gadds.map

Identifiers