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Eagle Airborne Magnetic and Radiometric Geophysical Survey
Eagle airborne magnetic and radiometric geophysical survey, Geophysical Report 2021-2 v. 2, covers parts of the Nulato Quadrangle west of Fairbanks, Alaska. Magnetic and radiometric data were collected with a helicopter between June 4 and 17, 2024, by EON Geosciences Inc. The survey contains a single block covering 1,975 km², which includes an infill block with tighter line spacing located in the northcentral portion of the block. A total of 6,459 line-kilometers were collected. The magnetometer was installed inside the stinger attached to the helicopter nose, and the airborne gamma-ray spectrometer was mounted on the interior floor of the helicopter cabin. The block was flown with a line spacing of 400 m, and the northcentral infill block was flown with 200 m spacing. Tie-lines for magnetic leveling were flown at 1,600 m spacing. We updated this dataset in 2025 to refine processing, removing artifacts and excess noise present in the final products provided by the original contractor. The raw data were reprocessed by Baigent Geosciences. The International Geomagnetic Reference Field correction was recalculated accounting for aircraft height, and the data were relevelled using Baigent Geosciences software. A complete and detailed report on the reprocessing steps undertaken is included in the publication documents. The result of the reprocessing is that leveling artifacts have been removed and the data now display finer features, including well-defined lineaments and other anomalies which were not present in the original contractor grids. The data, as well as additional metadata, are available from the DGGS website: http://doi.org/10.14509/31694.
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Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| bureauCode |
[ "010:12" ] |
| contactPoint |
{ "fn": "Alaska Division of Geological & Geophysical Surveys", "@type": "vcard:Contact", "hasEmail": "mailto:dggspubs@alaska.gov" } |
| description | Eagle airborne magnetic and radiometric geophysical survey, Geophysical Report 2021-2 v. 2, covers parts of the Nulato Quadrangle west of Fairbanks, Alaska. Magnetic and radiometric data were collected with a helicopter between June 4 and 17, 2024, by EON Geosciences Inc. The survey contains a single block covering 1,975 km², which includes an infill block with tighter line spacing located in the northcentral portion of the block. A total of 6,459 line-kilometers were collected. The magnetometer was installed inside the stinger attached to the helicopter nose, and the airborne gamma-ray spectrometer was mounted on the interior floor of the helicopter cabin. The block was flown with a line spacing of 400 m, and the northcentral infill block was flown with 200 m spacing. Tie-lines for magnetic leveling were flown at 1,600 m spacing. We updated this dataset in 2025 to refine processing, removing artifacts and excess noise present in the final products provided by the original contractor. The raw data were reprocessed by Baigent Geosciences. The International Geomagnetic Reference Field correction was recalculated accounting for aircraft height, and the data were relevelled using Baigent Geosciences software. A complete and detailed report on the reprocessing steps undertaken is included in the publication documents. The result of the reprocessing is that leveling artifacts have been removed and the data now display finer features, including well-defined lineaments and other anomalies which were not present in the original contractor grids. The data, as well as additional metadata, are available from the DGGS website: http://doi.org/10.14509/31694. |
| distribution |
[ { "@type": "dcat:Distribution", "title": "Digital Data", "format": "XML", "accessURL": "https://doi.org/10.14509/31694", "mediaType": "application/http", "description": "Landing page for access to the data" }, { "@type": "dcat:Distribution", "title": "Original Metadata", "format": "XML", "mediaType": "text/xml", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.6997a6bdb66b0100cceee6d1.xml" } ] |
| identifier | http://datainventory.doi.gov/id/dataset/USGS_6997a6bdb66b0100cceee6d1 |
| keyword |
[ "Aeromagnetic", "Aeromagnetic Data", "Aeromagnetic Map", "Aeromagnetic Survey", "Airborne Geophysical Survey", "Analytic Signal", "Arctic Dome", "Bear Creek", "Bedrock", "Bedrock Geology", "Black Mining District", "Bonanza Creek", "Boulder Creek", "Caribou Creek", "Champion Creek", "Chicago Boy Creek", "Circle Mining District", "Cripple Creek", "Crooked Creek", "DGGS", "Deadman Island", "Dome Creek", "Eagle", "Eagle Mining District", "Eagle Village", "Earth MRI", "Economic Geology", "Excelsior Creek", "Exploration", "Faults", "First Vertical Derivative", "Fish Creek", "Fixed Wing Survey", "Flat Creek", "Ford Lake", "Fortymile Dome", "Fortymile Mining District", "Fortymile River", "Fox Creek", "Geologic", "Geology", "Geophysical Map", "Geophysical Survey", "Geophysics", "Geophysics Search Tag", "Gold Bottom Creek", "Gold Creek", "Granite Creek", "Green Creek", "Happy New Year Creek", "Independence Creek", "Iron Creek", "King Solomon Creek", "Line Data", "Magnetic Data", "Magnetic Survey", "Magnetics", "Magnetometer Survey", "Mineral Exploration", "Mineral Resources", "Moose Creek", "Mount Eldridge", "Mount Harper", "Mount Veta", "Mount Warbelow", "North Peak", "Quartz Creek", "Radiometric Survey", "Radiometrics", "Raster Image", "Remote Sensing", "Rock Creek", "Seventymile", "Seventymile River", "Sheba Mountain", "Silver Bow Creek", "Slate Creek", "Strategic Minerals", "Strawberry Dome", "Trout Creek", "USGS:6997a6bdb66b0100cceee6d1", "Washington Creek", "Wilson Creek", "Yukon River", "Yukon-Tanana Upland", "geoscientificInformation" ] |
| modified | 2026-02-19T00:00:00Z |
| publisher |
{ "name": "U.S. Geological Survey", "@type": "org:Organization" } |
| spatial | -143.582148, 63.978089, -140.944196, 65.221429 |
| theme |
[ "geospatial" ] |
| title | Eagle Airborne Magnetic and Radiometric Geophysical Survey |
