Tok Geophysical Survey

The Tok 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, a GPS navigation system, 50/60 Hz monitors and a video camera. Flights were performed with an AS-350-B3 Squirrel helicopter at a mean terrain clearance of 60 m along NE-SW (12 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/Geological Mineral Inventory Program and the Alaska Strategic and Critical Minerals Assessment Capital Improvement Project.

Available Data Metadata Overview
File Name Data File Format Download File Size
tok_video_flightpath Video Order 77.0 G
tok_vector_data Vector data Download 1.5 G
tok_maps_prn_format Plot files Download 1.1 G
tok_databases_geosoft Line data Geosoft format database Download 862.2 M
tok_grids_geosoft Gridded data Geosoft format Download 81.6 M
tok_grids_ermapper Grid ERS files Download 173.0 M
tok_kmz Google Earth files Download 214.8 M
tok_images_registered Georeferenced raster files Download 308.7 M
tok_documents Adobe PDF files Download 34.9 M
tok_maps_pdf_format Adobe PDF files Download 252.0 M
tok_profiles_stacked Adobe PDF files Download 304.1 M
tok_ascii_data ASCII tabular files Download 3.0 G


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  • GPR 2015-2. Tok electromagnetic and magnetic airborne geophysical survey data compilation.