Data

Probabilistic airborne electromagnetic (AEM) inversion of 20 km AusAEM data, Phase 2

Geoscience Australia
Ray, A. ; Douglas, A. ; VanDerWielen, S. ; LeyCooper, Y. ; Brodie, R.C. ; Symington, N. ; Nicoll, M. ; Wong, S. ; Sun, Y. ; Czarnota, K.
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=info:doi10.26186/150339&rft.title=Probabilistic airborne electromagnetic (AEM) inversion of 20 km AusAEM data, Phase 2&rft.identifier=10.26186/150339&rft.publisher=Commonwealth of Australia (Geoscience Australia)&rft.description=This airborne electromagnetic (AEM) dataset provides regional scale probabilistic inversion products from 140,000 line km of airborne electromagnetic (AEM) data from the AusAEM program - Tranches 1 and 2 as well as AusAEM20-Western Australia. This completes the release of probabilistic inversion of 20-km spaced AEM data acquired under the Exploring for the Future program. Subsequent processing and probabilstic inversions were carried out as part of the Resourcing Australia's Prosperity initiative, using the open source HiQGA (High Quality Geophysical Analysis) code developed for this purpose (Ray 2022, Ray et al. 2023). Previously released Phase 01 products are available at Ray et al. 2024, eCat 149375.While deterministic inversions are the mainstay of reconnaisance with AEM, the main benefits of a probabilistic inversion are:- Loss of signal sensitivity at depth does not “fade to blue” by returning to the resistive deterministic reference model. Ambiguous subsurface features become clearer when examining multiple probability percentiles.- Fine features and confidence in their interpretability are brought out by examining multiple probability percentiles.Further details are provided in the accompanying technical note.Conductivity products from the following surveys are available:- AusAEM 02 Tranche 1- AusAEM 02 Tranche 2- AusAEM20-WA Earaheedy Desert Strip - AusAEM20-WA Yilgarn- AusAEM20-WA Eastern Goldfields- AusAEM20-WA SW Albany- AusAEM20-WA Murchison- Capricorn (legacy) The 10th, 50th and 90th and mean percentiles of log10 conductivity are provided in a variety of formats:- VTK structured grids- ASCII point clouds- ASEG-GDF2 files- GOCAD S-gridsShape files associated with the inverted lines have also been provided.All products have been provided in the coordinate reference system (CRS) the original AEM data were provided in. The VTK unstructured grids are also provided in GDA94 geodetic longitude, latitude coordinates for ease of display in the same CRS.Maintenance and Update Frequency: asNeededStatement: Follows from eCat 149375 (Phase 1 probabilistic inversions) Summary document was updated 4 November 2025&rft.creator=Ray, A. &rft.creator=Douglas, A. &rft.creator=VanDerWielen, S. &rft.creator=LeyCooper, Y. &rft.creator=Brodie, R.C. &rft.creator=Symington, N. &rft.creator=Nicoll, M. &rft.creator=Wong, S. &rft.creator=Sun, Y. &rft.creator=Czarnota, K. &rft.date=2025&rft.coverage=westlimit=112.00; southlimit=-44.00; eastlimit=154.00; northlimit=-9.00&rft.coverage=westlimit=112.00; southlimit=-44.00; eastlimit=154.00; northlimit=-9.00&rft_rights=Creative Commons Attribution 4.0 International Licence https://creativecommons.org/licenses/by/4.0/&rft_rights=© Commonwealth of Australia (Geoscience Australia) 2025&rft_rights=Australian Government Security Classification System https://www.protectivesecurity.gov.au/publications-library/policy-8-classification-system&rft_subject=geoscientificInformation&rft_subject=geophysical inversion&rft_subject=uncertainty analysis&rft_subject=AEM&rft_subject=electrical conductivity&rft_subject=EFTF – Exploring for the Future&rft_subject=Resourcing Australia's Prosperity&rft_subject=Electrical and Electromagnetic Methods in Geophysics&rft.type=dataset&rft.language=English Access the data
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Creative Commons Attribution 4.0 International Licence
https://creativecommons.org/licenses/by/4.0/

© Commonwealth of Australia (Geoscience Australia) 2025

Australian Government Security Classification System
https://www.protectivesecurity.gov.au/publications-library/policy-8-classification-system

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Full description

This airborne electromagnetic (AEM) dataset provides regional scale probabilistic inversion products from 140,000 line km of airborne electromagnetic (AEM) data from the AusAEM program - Tranches 1 and 2 as well as AusAEM20-Western Australia. This completes the release of probabilistic inversion of 20-km spaced AEM data acquired under the Exploring for the Future program. Subsequent processing and probabilstic inversions were carried out as part of the Resourcing Australia's Prosperity initiative, using the open source HiQGA (High Quality Geophysical Analysis) code developed for this purpose (Ray 2022, Ray et al. 2023). Previously released Phase 01 products are available at Ray et al. 2024, eCat 149375.

While deterministic inversions are the mainstay of reconnaisance with AEM, the main benefits of a probabilistic inversion are:

- Loss of signal sensitivity at depth does not “fade to blue” by returning to the resistive deterministic reference model. Ambiguous subsurface features become clearer when examining multiple probability percentiles.
- Fine features and confidence in their interpretability are brought out by examining multiple probability percentiles.

Further details are provided in the accompanying technical note.

Conductivity products from the following surveys are available:

- AusAEM 02 Tranche 1
- AusAEM 02 Tranche 2
- AusAEM20-WA Earaheedy Desert Strip
- AusAEM20-WA Yilgarn
- AusAEM20-WA Eastern Goldfields
- AusAEM20-WA SW Albany
- AusAEM20-WA Murchison
- Capricorn (legacy)
The 10th, 50th and 90th and mean percentiles of log10 conductivity are provided in a variety of formats:

- VTK structured grids
- ASCII point clouds
- ASEG-GDF2 files
- GOCAD S-grids

Shape files associated with the inverted lines have also been provided.

All products have been provided in the coordinate reference system (CRS) the original AEM data were provided in. The VTK unstructured grids are also provided in GDA94 geodetic longitude, latitude coordinates for ease of display in the same CRS.

Lineage

Maintenance and Update Frequency: asNeeded
Statement: Follows from eCat 149375 (Phase 1 probabilistic inversions) Summary document was updated 4 November 2025

Notes

Purpose
Pre-competititve data analysis

Created: 31 03 2025

Issued: 17 04 2025

This dataset is part of a larger collection

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154,-9 154,-44 112,-44 112,-9 154,-9

133,-26.5

text: westlimit=112.00; southlimit=-44.00; eastlimit=154.00; northlimit=-9.00

Subjects
AEM | EFTF – Exploring for the Future | Electrical and Electromagnetic Methods in Geophysics | Resourcing Australia's Prosperity | electrical conductivity | geophysical inversion | geoscientificInformation | uncertainty analysis |

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Other Information
Download summary document describing package contents (pdf) [10.9 MB]

url : https://d28rz98at9flks.cloudfront.net/150339/150339_00_1.pdf

Download conductivity percentiles in ASEG-GDF format [161.7 MB]

url : https://d28rz98at9flks.cloudfront.net/150339/150339_01_0.zip

Download conductivity percentiles as summary PNG images [6.8 GB]

url : https://d28rz98at9flks.cloudfront.net/150339/150339_02_0.zip

Download 3D GOCAD SGrids [446 MB]

url : https://d28rz98at9flks.cloudfront.net/150339/150339_03_0.zip

Download line locations as shapefiles (shp gpkg) [5.5 MB]

url : https://d28rz98at9flks.cloudfront.net/150339/150339_04_0.zip

Download conductivity percentiles as 3D VTK structured in MGA survey projections (vts) [303 MB]

url : https://d28rz98at9flks.cloudfront.net/150339/150339_05_0.zip

Download conductivity percentiles as 3D VTK structured grids in GDA94 longitude latitude (vts) [304.6 MB]

url : https://d28rz98at9flks.cloudfront.net/150339/150339_06_0.zip

Download conductivity percentiles as ASCII plain text files in MGA survey projections (txt) [714.6 MB]

url : https://d28rz98at9flks.cloudfront.net/150339/150339_07_0.zip

Identifiers
ACN 633 798 857