Probabilistic airborne electromagnetic inversion of 20 km AusAEM data, North East Queensland, 2025

<div>This airborne electromagnetic (AEM) dataset provides regional scale probabilistic inversion products from 35,000 line km of airborne electromagnetic (AEM) data from the Northeast Queensland AusAEM 2024 survey with inter-line spacing of 20 km (Ley-Cooper & Deo 2025). Under the aegis of the Resourcing Australia's Prosperity initiative (RAPi), this continues the release of probabilistic inversion products from AEM data acquired under the Exploring for the Future program (2016-2024). All AEM data were inverted using the open source HiQGA (High Quality Geophysical Analysis) code developed for this purpose (Ray et al. 2023a,b). Previously released Phase 01 and Phase 02 products are available at Ray et al. (2024, eCat 149375) and Ray et al. (2025, eCat 150339).</div><div><br></div><div>While deterministic inversions are the mainstay of reconnaisance surveying with AEM, the main benefits of a probabilistic inversion are:</div><div><br></div><div>- Loss of signal sensitivity at depth does not “fade to blue” by returning to the resistive deterministic reference model.</div><div>- Fine features and confidence in their interpretability are brought out by examining multiple probability percentiles.</div><div>- Survey join artefacts, though inevitable, are largely minimised, leading to seamless interpretability.</div><div>- Quick scanning for conductors using the 10th (low) percentile of log10 conductivity, and resistors using the 90th (high) percentile of log10 conductivity.</div><div><br></div><div>Further details are provided in the accompanying technical note.</div><div><br></div><div>The 10th, 50th and 90th and mean percentiles of log10 conductivity are provided in a variety of formats:</div><div><br></div><div>- VTK structured grids</div><div>- ASCII point clouds</div><div>- ASEG-GDF2 files</div><div>- GOCAD S-grids</div><div><br></div><div>Shape files associated with the inverted lines can also be found in the release package.</div><div><br></div><div>AEMConvertInterp input files (Nicoll et al. 2025) for the geological interpretation workflow detailed in Wong et al. (2022) have also been provided. </div><div><br></div><div>Additionally, georeferenced images can be used from the above input files, but they are not required by the above workflow and are not guaranteed to render with the right orientation at all times.</div><div><br></div><div>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.</div>

Identification info

Date (Creation): 2025-12-03

Date (Publication): 2025-12-04T02:36:08.247Z

Citation identifier: Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/150739

Identifier

Code: 10.26186/150739

Codespace: doi.org

Description: Digital Object Identifier (DOI)

Cited responsible party

Role	Organisation / Individual Name	Details
Publisher	Commonwealth of Australia (Geoscience Australia)	Voice
Author	Scarr, T.	Internal Contact
Author	Ray, A.	Internal Contact
Author	VanDerWielen, S.	Internal Contact
Author	LeyCooper, Y.	Internal Contact
Author	Deo, R.	Internal Contact
Author	Nicoll, M.	Internal Contact
Author	Wong, S.	Internal Contact
Author	Czarnota, K.	Internal Contact

Purpose: For geological interpretation of the near surface down to 400 m.

Status: Completed

Point of contact

Role	Organisation / Individual Name	Details
Resource provider	Minerals, Energy and Groundwater Division	External Contact
Point of contact	Commonwealth of Australia (Geoscience Australia)	Voice
Point of contact	Ray, A.	Internal Contact

Spatial representation type

Topic category

Geoscientific information

Extent

Maintenance and update frequency: As needed

Resource format

Title: Product data repository: Various Formats

Protocol: FILE:DATA-DIRECTORY

Name of the resource: Data Store directory containing the digital product files

Description: Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes

Keywords

airborne electromagnetics

Keywords

probability

Keywords

uncertainty

Project

Resourcing Australia's Prosperity

theme.ANZRC Fields of Research.rdf

Electrical and Electromagnetic Methods in Geophysics

Keywords

Published_External

Resource constraints

Title: Creative Commons Attribution 4.0 International Licence

Alternate title: CC-BY

Edition: 4.0

Website

https://creativecommons.org/licenses/by/4.0/

Addressee

Role	Organisation / Individual Name	Details
User	Any

Use constraints: License

Use constraints: Other restrictions

Other constraints: © Commonwealth of Australia (Geoscience Australia) 2025

Resource constraints

Title: Australian Government Security Classification System

Edition date: 2018-11-01T00:00:00

Website

https://www.protectivesecurity.gov.au/pspf-annual-release

Classification: Unclassified

Classification system: Australian Government Security Classification System

Associated resource

Association Type: Series

Title: Probabilistic airborne electromagnetic inversion of 20 km AusAEM data, Phase 1

Citation identifier: 149375

Citation identifier: f1b141b7-8c2d-497e-9823-fa584820ba05

Website

http://pid.geoscience.gov.au/dataset/ga/149375

Link to eCat metadata record landing page

Associated resource

Association Type: Series

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

Citation identifier: 150339

Citation identifier: d840622a-85b9-4548-91d4-11fe5c6180b0

Website

http://pid.geoscience.gov.au/dataset/ga/150339

Link to eCat metadata record landing page

Language: English

Character encoding: UTF8

Distribution Information

OnLine resource: Download summary document describing package contents (pdf) [2.1 MB]

Download summary document describing package contents (pdf) [2.1 MB]

OnLine resource: Download conductivity percentiles in ASEG-GDF format [101.2 MB]

Download conductivity percentiles in ASEG-GDF format [101.2 MB]

OnLine resource: Download conductivity percentiles as summary PNG images [6.8 GB]

Download conductivity percentiles as summary PNG images [6.8 GB]

OnLine resource: Download 3D GOCAD SGrids [333.5 MB]

Download 3D GOCAD SGrids [333.5 MB]

OnLine resource: Download line locations as shapefiles (shp gpkg) [3.2 MB]

Download line locations as shapefiles (shp gpkg) [3.2 MB]

OnLine resource: Download conductivity percentiles as 3D VTK structured in MGA survey projections (vts) [208.2 MB]

Download conductivity percentiles as 3D VTK structured in MGA survey projections (vts) [208.2 MB]

OnLine resource: Download conductivity percentiles as 3D VTK structured grids in GDA94 longitude latitude (vts) [228.8 MB]

Download conductivity percentiles as 3D VTK structured grids in GDA94 longitude latitude (vts) [228.8 MB]

OnLine resource: Download conductivity percentiles as ASCII plain text files in MGA survey projections (txt) [435.3 MB]

Download conductivity percentiles as ASCII plain text files in MGA survey projections (txt) [435.3 MB]

OnLine resource: Download Input files (geometry and JPEG) for the AEMInterpConvert tool [198.1 MB]

Download Input files (geometry and JPEG) for the AEMInterpConvert tool [198.1 MB]

Distribution Information

Distributor contact

Role	Organisation / Individual Name	Details
Distributor	Commonwealth of Australia (Geoscience Australia)	Voice

Resource lineage

Statement: <div>Follows from eCat 149375 (Phase 1 probabilistic inversions) and eCat 150339 (Phase 2 probabilistic inversions).</div>

Metadata constraints

Title: Australian Government Security Classification System

Edition date: 2018-11-01T00:00:00

Website

https://www.protectivesecurity.gov.au/pspf-annual-release

Classification: Unclassified

Metadata

Metadata identifier

urn:uuid/41a7d045-0192-44ba-910e-cd8e095ad986

Title: GeoNetwork UUID

Language: English

Character encoding: UTF8

Contact

Role	Organisation / Individual Name	Details
Point of contact	Commonwealth of Australia (Geoscience Australia)	Voice
Point of contact	Ray, A.	Internal Contact

Type of resource

Resource scope: Dataset

Alternative metadata reference

Title: Geoscience Australia - short identifier for metadata record with uuid

Citation identifier: eCatId/150739

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/api/records/41a7d045-0192-44ba-910e-cd8e095ad986

Date info (Creation): 2025-12-04T02:36:55.992Z

Date info (Creation): 2025-11-04T03:14:47.522Z

Date info (Revision): 2026-06-21T22:27:37.164Z

Metadata standard

Title: AU/NZS ISO 19115-1:2014

Metadata standard

Title: ISO 19115-1:2014

Metadata standard

Title: ISO 19115-3

Title: Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

Edition: Version 2.0, September 2018

Citation identifier: https://pid.geoscience.gov.au/dataset/ga/122551

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Read here the full details and access to the data.

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