{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Benjamin J. Drenth", "hasEmail": "mailto:bdrenth@usgs.gov"}, "description": "This data release provides digital flight line data for a high-resolution airborne magnetic survey over the western Spirit Lake tectonic zone region, covering parts of northwestern Iowa, northeastern Nebraska, southeastern South Dakota, and southwestern Minnesota. The airborne survey was funded by the Earth Mapping Resources Initiative. The survey was designed to meet complementary needs related to geologic mapping and characterization of mineral resource potential. A total of 274,148 line km of magnetic data were acquired over an irregularly shaped area of approximately 99,500 km2. Data were collected from fixed-wing aircraft flown at a nominal terrain clearance of 100 meters (m) above topography along N-S flight lines spaced at 400-m intervals. Tie lines were flown in an E-W direction every 4,000 m. Data were collected by Sander Geophysics Limited and Dewberry under contract to the USGS using airplanes with a magnetometer mounted in a stinger. The survey operated out of airports in O\u2019Neill and Omaha, Nebraska, and Carroll, Iowa, from May of 2023 to August of 2024. Files that are available in this publication include flight line data for the magnetic survey and a report describing the survey parameters, field operations, quality control and data reduction procedures. A zip file is provided that contains the contractor's deliverable products that includes Geosoft databases and grids for the magnetic survey and the report describing the survey and data reduction.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P13KQ2CS", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.68ae715dd4be025fdd4b3384.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_68ae715dd4be025fdd4b3384", "keyword": ["AASG", "Aeromagnetic survey", "Airborne geophysical survey", "Antelope County", "Association of American State Geologists", "Audubon County", "Blaine County", "Blue Earth County", "Bon Homme County", "Boone County", "Boyd County", "Brown County", "Buena Vista County", "Burt County", "Butler County", "Calhoun County", "Carroll County", "Cedar County", "Charles Mix County", "Cherokee County", "Cherry County", "Clay County", "Colfax County", "Cottonwood County", "Crawford County", "Cuming County", "Dakota County", "Dallas County", "Dickinson County", "Dixon County", "Dodge County", "Douglas County", "Earth Mapping Resources Initiative", "EarthMRI", "Emmet County", "Faribault County", "Freeborn County", "GEMSC", "GGGSC", "Garfield County", "Geology, Energy & Minerals Science Center", "Geology, Geophysics, and Geochemistry Science Center", "Greeley County", "Greene County", "Gregory County", "Guthrie County", "Hancock County", "Harrison County", "Holt County", "Humboldt County", "Hutchinson County", "Ida County", "Iowa", "Jackson County", "Keya Paha County", "Knox County", "Kossuth County", "Le Sueur County", "Lincoln County", "Loup County", "Lyon County", "MRP", "Madison County", "Martin County", "Merrick County", "Mineral Resources Program", "Minnehaha County", "Minnesota", "Monona County", "Murray County", "NCGMP", "Nance County", "National Cooperative Geologic Mapping Program", "Nebraska", "Nicollet County", "Nobles County", "OBrien County", "Osceola County", "Palo Alto County", "Pierce County", "Pipestone County", "Platte County", "Plymouth County", "Pocahontas County", "Polk County", "Pottawattamie County", "Rock County", "Sac County", "Saunders County", "Shelby County", "Sioux County", "South Dakota", "Stanton County", "Thurston County", "Todd County", "Tripp County", "Turner County", "U.S. Geological Survey", "USGS", "USGS:68ae715dd4be025fdd4b3384", "Union County", "United States", "Waseca County", "Washington County", "Watonwan County", "Wayne County", "Webster County", "Wheeler County", "Winnebago County", "Woodbury County", "Wright County", "Yankton County", "economic geology", "geophysics", "geoscientificInformation", "geospatial datasets", "magnetic field (earth)", "mineral resources", "sedimentology", "structural geology"], "modified": "2026-03-16T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-100.1923, 41.3289, -93.7158, 44.1328", "theme": ["geospatial"], "title": "Airborne magnetic survey, western Spirit Lake tectonic zone region, Iowa, Nebraska, South Dakota, and Minnesota, 2023-2024"}