DOI: 10.26186/149118
title: Yathong, Forbes, Dubbo, and Coonabarabran, Airborne Electromagnetic Survey Blocks. HELITEM airborne electromagnetic data and GALEI conductivity estimates

description: <strong>Yathong, Forbes, Dubbo, and Coonabarabran Airborne Electromagnetic Survey Blocks.</strong><br>Geoscience Australia (GA), in collaboration with the Geological Survey of New South Wales (GNSW), conducted an airborne electromagnetic (AEM) survey between April and June 2023. The area covered, spanned from the north-eastern end of the Yathong-Ivanhoe Trough, and extended across the greater Forbes, Dubbo, to Coonabarabran regions of New South Wales. A total of 15, 090-line kilometres of new AEM and magnetic geophysical data were acquired. This survey was entirely funded by GSNSW and GA managed acquisition, quality control, processing, modelling, and inversion of the AEM data.<br>The survey was flown by Xcalibur Aviation (Australia) Pty Ltd using a 6.25 Hz HELITEM® AEM system. The survey blocks were flown at 2500-metre nominal line spacings, with variations down to 100 metres in the Coonabarabran block. It was flown following East-West line directions. Xcalibur also processed the acquired data. This data package includes the acquisition and processing report, the final processed AEM data, and the results of the contractor's conductivity-depth estimates. The data package also contains the results and derived products from a 1D inversion by Geoscience Australia with its own inversion software.<br>The survey will be incorporated and become part of the national AusAEM airborne electromagnetic acquisition program, which aims to provide geophysical information to support investigations of the regional geology and groundwater.<br><strong>The data release package contains:</strong><br>1. A data release package <strong>summary PDF document</strong>2. The <strong>survey logistics and processing report</strong> and HELITEM® system specification files3. <strong>Final processed point located line data</strong> in ASEG-GDF2 format for the five areas -final processed dB/dt electromagnetic, magnetic and elevation data -final processed B field electromagnetic, magnetic and elevation data<strong> <em>Conductivity estimates generated by Xcalibur’s inversion </em></strong> -point located conductivity-depth line data output from the inversion in ASEG-GDF2 format -graphical (PDF) multiplot conductivity stacks and section profiles for each flight line -graphical (PNG) conductivity sections for each line -grids generated from the Xcalibur’s inversion in ER Mapper® format (layer conductivities slices, DTM, X & Z component for each of the 25 channels, time constants, TMI)4.<strong> ESRI shape and KML</strong> (Google Earth) files for the flight lines and boundary5<strong>. Conductivity estimates generated by Geoscience Australia's inversion </strong> -point located line data output from the inversion in ASEG-GDF2 format -graphical (pdf) multiplot conductivity sections for each line -georeferenced (PNG) conductivity sections (suitable for pseudo-3D display in a 2D GIS) -GoCAD™ S-Grid 3D objects (suitable for various 3D packages) -Curtain image conductivity sections in log & liner colour stretch (suitable 3D display in GA’s EarthSci)<br><strong>Directory structure</strong>├── <strong>01_Report</strong>├── <strong>02_XCalibur_delivered</strong>│   ├── * survey_block_Name│ ├── cdi│ │ ├── sections│ │ └── stacks│ ├── grids│ │ ├── cnd│ │ ├── dtm│ │ ├── emxbf│ │ ├── emxdb│ │ ├── emxff│ │ ├── emxzbf│ │ ├── emzdb│ │ ├── time_constant│ │ └── tmi│ ├── located_data│ ├── maps│ └── waveform│   ├── <strong>03_Shape&kml</strong>└── <strong>04_GA_Layer_Earth_inversion</strong> ├── * survey_block_Name ├── GA_georef_sections │ ├── linear-stretch │ └── log-stretch ├── GA_Inverted_conductivity_models ├── GA_multiplots └── GA_sgrids