Data

Roper River - Phelp, NT, 1993 (P610), magnetic line data, AWAGS levelled

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=https://pid.geoscience.gov.au/dataset/ga/140800&rft.title=Roper River - Phelp, NT, 1993 (P610), magnetic line data, AWAGS levelled&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/140800&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. These line dataset from the Roper River, NT, 1993 survey were acquired in 1993 by the NT Government, and consisted of 19738 line-kilometres of data at 500m line spacing and 100m 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.Maintenance and Update Frequency: notPlannedStatement: This Roper River - Phelp, NT, 1993 (P610), magnetic line data, AWAGS levelled is an airborne-derived magnetic line dataset for the Roper River, NT, 1993 survey. The data was acquired under the project No. 610 for the geological survey of NT. A total of 19738 line-kilometres of data at a line spacing of 500m and 100m 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).&rft.creator=Geophysical Acquisition & Processing Section &rft.date=2019&rft.coverage=westlimit=134.9512; southlimit=-14.5126; eastlimit=135.5151; northlimit=-13.9319; projection=GDA94 (EPSG:4283)&rft.coverage=westlimit=134.9512; southlimit=-14.5126; eastlimit=135.5151; northlimit=-13.9319; projection=GDA94 (EPSG:4283)&rft_rights=&rft_rights=Creative Commons Attribution 4.0 International Licence&rft_rights=CC-BY&rft_rights=4.0&rft_rights=http://creativecommons.org/licenses/&rft_rights=(c) Commonwealth of Australia (Geoscience Australia) and Northern Territory of Australia (Northern Territory Geological Survey) 2019&rft_rights=Australian Government Security ClassificationSystem&rft_rights=https://www.protectivesecurity.gov.au/Pages/default.aspx&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft_subject=geoscientificInformation&rft_subject=EARTH SCIENCES&rft_subject=Earth sciences&rft_subject=geophysics&rft_subject=line&rft_subject=Australia&rft_subject=NT&rft_subject=survey 610&rft_subject=AWAGS&rft_subject=GADDS2.0&rft_subject=magnetics&rft_subject=magnetism and palaeomagnetism&rft_subject=magnetic&rft_subject=airborne digital data&rft_subject=vector&rft_subject=geophysical survey&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data
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Creative Commons Attribution 4.0 International Licence
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(c) Commonwealth of Australia (Geoscience Australia) and Northern Territory of Australia (Northern Territory Geological Survey) 2019

Australian Government Security ClassificationSystem

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Contact Information

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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.
These line dataset from the Roper River, NT, 1993 survey were acquired in 1993 by the NT Government, and consisted of 19738 line-kilometres of data at 500m line spacing and 100m 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 Roper River - Phelp, NT, 1993 (P610), magnetic line data, AWAGS levelled is an airborne-derived magnetic line dataset for the Roper River, NT, 1993 survey. The data was acquired under the project No. 610 for the geological survey of NT. A total of 19738 line-kilometres of data at a line spacing of 500m and 100m 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: 05 10 1993 to 28 10 1993

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135.5151,-13.9319 135.5151,-14.5126 134.9512,-14.5126 134.9512,-13.9319 135.5151,-13.9319

135.23315,-14.22225

text: westlimit=134.9512; southlimit=-14.5126; eastlimit=135.5151; northlimit=-13.9319; projection=GDA94 (EPSG:4283)

Subjects
AWAGS | Australia | EARTH SCIENCES | Earth sciences | GADDS2.0 | NT | Published_External | airborne digital data | geophysical survey | geophysics | geoscientificInformation | line | magnetic | magnetics | magnetism and palaeomagnetism | survey 610 | 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)

uri : https://portal.ga.gov.au/persona/gadds

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