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Tonsina Geophysical Survey

The Tonsina electromagnetic and magnetic airborne geophysical survey data were acquired with a DIGHEMv Electromagnetic (EM) system and a CGG D1344 cesium magnetometer with a Scintrex CS3 cesium sensor. The EM and magnetic sensors were flown at a height of 30 meters (m). In addition the survey recorded data from radar and laser altimeters, GPS navigation system, 50/60 Hz monitors and video camera. Flights were performed with an AS-350-B3 Squirrel helicopter at a mean terrain clearance of 60 m along NW-SE (345 degrees) survey flight lines with a spacing of 400 m. Tie lines were flown perpendicular to the flight lines at intervals of approximately 4,800 m. These data were produced under contract between the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS), and CGG Land (U.S.) Inc. Airborne geophysical data for the area were acquired and processed by CGG in 2014 and 2015. The project was funded by the Alaska State Legislature as part of the Alaska Airborne Geophysical and Geological Mineral Inventory Program and the Alaska Strategic and Critical Minerals Assessment Capital Improvement Project.

Available Data Metadata Overview
File Name Data File Format File Size Info
Order offline geospatial data Video 25.7 G Read me
Download tonsina_vector_data Vector data 270.7 M Read me
Download tonsina_maps_prn_format Plot files 280.1 M Read me
Download tonsina_databases_geosoft Linedata Geosoft format database 232.3 M Read me
Download tonsina_grids_geosoft Gridded data Geosoft format 61.2 M Read me
Download tonsina_grids_ermapper Gridded data ER Mapper 61.2 M Read me
Download tonsina_kmz Google Earth files 31.2 M Read me
Download tonsina_images_registered Georeferenced raster files 44.1 M Read me
Download tonsina_documents Adobe PDF files 162.1 M Read me
Download tonsina_maps_pdf_format Adobe PDF files 247.5 M Read me
Download tonsina_profiles_stacked Adobe PDF files 81.1 M Read me
Download tonsina_ascii_data ASCII tabular files 911.9 M Read me

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