Data

Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - vBzz (Phase) grid

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/144746&rft.title=Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - vBzz (Phase) grid&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/144746&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 0.00083 degrees (approximately 88m).The data are in nanoTesla per metre (or nT/m). 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. This survey grid is essentially levelled to AWAGS. 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-15 geomagnetic reference model using a data representative date and elevation representative of the survey. A further enhancement has been completed to enhance the geological interpretation of the data.Maintenance and Update Frequency: notPlannedStatement: This Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - vBzz (Phase) grid is an airborne-derived Total Magnetic Intensity (TMI) Reduced to the Pole (RTP) enhanced grid for the Magnetic Anomaly Map of Australia, Seventh Edition, 2019 (Poudjom Djomani et al., 2019). The survey was acquired under the project No. 1324. The 2019 magnetic grid was derived from a complete re-levelling of the national magnetic grid database. The survey grids were levelled to each other, and to the Australia Wide Airborne Geophysical Survey (AWAGS) (Milligan et al., 2009), which serves as a baseline to constrain long wavelengths in the final grid. The levelling and grid-merging procedure was described in detail in Minty et al. (2003). The grid has a cell size of 0.00083 degrees (approximately 88m). The data are in nanoTesla per metre (or nT/m). 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-15 geomagnetic reference model using a data representative date and elevation representative of the survey. A further enhancement has been completed to enhance the geological interpretation of the data. 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; Minty, B.R.S., Milligan, P.R., Luyendyk, A.P.J. and Mackey, T., 2003. Merging airborne magnetic surveys into continental-scale compilations. Geophysics, 68 (3), 988-995; Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition); Poudjom Djomani, Y., Minty, B.R.S., Hutchens, M., Lane, R.J.L. 2019, Total Magnetic Intensity (TMI) Grid of Australia 2019 - seventh edition - 80 m cell size. Geoscience Australia, Canberra. http://dx.doi.org/10.26186/5e9cf3f2c0f1d, eCat record number 131505.&rft.creator=Geophysical Acquisition & Processing Section &rft.date=2020&rft.coverage=westlimit=105.9996; southlimit=-43.9301; eastlimit=154.6635; northlimit=-9.0265; projection=GDA94 (EPSG:4283)&rft.coverage=westlimit=105.9996; southlimit=-43.9301; eastlimit=154.6635; northlimit=-9.0265; 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) 2020&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=NCI&rft_subject=Earth sciences&rft_subject=geophysics&rft_subject=grid&rft_subject=Australia&rft_subject=None&rft_subject=survey 1324&rft_subject=GADDS2.0&rft_subject=TMI&rft_subject=RTP&rft_subject=AWAGS&rft_subject=magnetics&rft_subject=magnetism&rft_subject=palaeomagnetism&rft_subject=airborne digital data&rft_subject=national&rft_subject=geophysical survey&rft_subject=mag&rft_subject=total magnetic intensity&rft_subject=reduced to the pole&rft_subject=raster&rft_subject=pseudo-gravity transformation&rft_subject=total horizontal derivative filter&rft_subject=pseudo susceptibility&rft_subject=tilt angle&rft_subject=total horizontal gradient&rft_subject=variable vertical gradient of TMI vertical component&rft_subject=VBzz&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data
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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. This magnetic grid has a cell size of 0.00083 degrees (approximately 88m).The data are in nanoTesla per metre (or nT/m). 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. This survey grid is essentially levelled to AWAGS. 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-15 geomagnetic reference model using a data representative date and elevation representative of the survey. A further enhancement has been completed to enhance the geological interpretation of the data.

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Maintenance and Update Frequency: notPlanned
Statement: This Magnetic Anomaly Map of Australia, Seventh Edition, 2020 - Enhanced Products Package - vBzz (Phase) grid is an airborne-derived Total Magnetic Intensity (TMI) Reduced to the Pole (RTP) enhanced grid for the Magnetic Anomaly Map of Australia, Seventh Edition, 2019 (Poudjom Djomani et al., 2019). The survey was acquired under the project No. 1324. The 2019 magnetic grid was derived from a complete re-levelling of the national magnetic grid database. The survey grids were levelled to each other, and to the Australia Wide Airborne Geophysical Survey (AWAGS) (Milligan et al., 2009), which serves as a baseline to constrain long wavelengths in the final grid. The levelling and grid-merging procedure was described in detail in Minty et al. (2003). The grid has a cell size of 0.00083 degrees (approximately 88m). The data are in nanoTesla per metre (or nT/m). 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-15 geomagnetic reference model using a data representative date and elevation representative of the survey. A further enhancement has been completed to enhance the geological interpretation of the data. 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; Minty, B.R.S., Milligan, P.R., Luyendyk, A.P.J. and Mackey, T., 2003. Merging airborne magnetic surveys into continental-scale compilations. Geophysics, 68 (3), 988-995; Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition); Poudjom Djomani, Y., Minty, B.R.S., Hutchens, M., Lane, R.J.L. 2019, Total Magnetic Intensity (TMI) Grid of Australia 2019 - seventh edition - 80 m cell size. Geoscience Australia, Canberra. http://dx.doi.org/10.26186/5e9cf3f2c0f1d, eCat record number 131505.

Created: 03 11 2020

Issued: 03 11 2020

Modified: 05 07 2021

Data time period: 2019 to 31 12 2019

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154.6635,-9.0265 154.6635,-43.9301 105.9996,-43.9301 105.9996,-9.0265 154.6635,-9.0265

130.33155,-26.4783

text: westlimit=105.9996; southlimit=-43.9301; eastlimit=154.6635; northlimit=-9.0265; projection=GDA94 (EPSG:4283)

Subjects
AWAGS | Australia | EARTH SCIENCES | Earth sciences | GADDS2.0 | NCI | None | Published_External | RTP | TMI | VBzz | airborne digital data | geophysical survey | geophysics | geoscientificInformation | grid | mag | magnetics | magnetism | national | palaeomagnetism | pseudo susceptibility | pseudo-gravity transformation | raster | reduced to the pole | survey 1324 | tilt angle | total horizontal derivative filter | total horizontal gradient | total magnetic intensity | variable vertical gradient of TMI vertical component |

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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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