@prefix dcat: . @prefix dct: . @prefix foaf: . @prefix gsp: . @prefix locn: . @prefix vcard: . @prefix xsd: . a dcat:Dataset ; dct:description """Airborne electromagnetic (AEM), magnetic, and radiometric data were acquired November 2019 to March 2020 along 24,030 line-kilometers (line-km) over the Mississippi Alluvial Plain (MAP). Data were acquired by CGG Canada Services, Ltd. with three different airborne sensors: the CGG Canada Services, Ltd. TEMPEST time-domain AEM instrument that is used to map subsurface geologic structure at depths up to 300 meters (m), depending on the subsurface resistivity; a Scintrex CS-3 cesium vapor magnetometer that detects changes in deep (hundreds of meters to kilometers) geologic structure based on variations in the magnetic properties of different formations; and a Radiation Solutions RS-500 spectrometer that detects the abundance of natural radioelements potassium, uranium, and thorium in the upper 20-30 centimeters that is used to determine differences in soil constituents. The survey was flown at a nominal sensor flight height of 120 m above terrain with 6-kilometer spaced east-west flight lines. The main survey block covers 22,250 line-km. The Mississippi River and the Arkansas River were surveyed along their center axes, covering 1,225 line-km (flight line numbers 500101 and 700201-700206 nonsuccessive), and three separate inset grids were flown: (1) Ozark basement reconnaissance lines with variable line spacing for a total of 234 line-km (flight line numbers 400801-401401 nonsuccessive), (2) Shellmound focus area in Mississippi with 250 m line spacing for a total of 485 line-km (flight line numbers 604501-608101 nonsuccessive), and (3) New Madrid Seismic Zone focus area in Missouri and Tennessee with variable line spacing for a total of 161 line-km (flight line numbers 710101-710401 nonsuccessive). 91-series lines are repeat test-lines flown periodically throughout the survey, with one repeat line established for each base station. 902- and 905-series lines are ~60 second high-altitude datasets collected pre- and post- flight, respectively, to evaluate the system out of ground-response. This data release includes inverted depth sections along all flight lines from the AEM data (https://www.sciencebase.gov/catalog/item/5f4e954682ce4c3d1233cb84). Digital data from production flights are provided in ASEG-GDF2 format, an ASCII format geophysical data standard that uses a self-describing collection of files to allow data to be automatically identified and read by a computer application. Data fields in the data file (.DAT) are defined in the associated definition file (.DFN). Please see the ReadME included in this data release for a description of how to interpret the .DFN files or visit https://www.aseg.org.au/sites/default/files/pdf/ASEG-GDF2-REV4.pdf for more information on the ASEG-GDF2 standard.""" ; dct:identifier "USGS:5f4e954682ce4c3d1233cb84" ; dct:issued "2025-11-23T00:00:17.053213"^^xsd:dateTime ; dct:modified "20210204"^^xsd:gYear ; dct:publisher ; dct:spatial [ a dct:Location ; locn:geometry "POLYGON ((-92.9233 30.7884, -92.9233 37.8048, -88.5358 37.8048, -88.5358 30.7884, -92.9233 30.7884))"^^gsp:wktLiteral ] ; dct:title "Airborne electromagnetic, magnetic, and radiometric survey of the Mississippi Alluvial Plain, November 2019 - March 2020: AEM inverted resistivity models" ; dcat:contactPoint [ a vcard:Organization ; vcard:fn "Burke J Minsley" ; vcard:hasEmail ] ; dcat:distribution , ; dcat:keyword "aeromagnetic-surveying", "aeroradiometric-surveying", "amerigeo", "amerigeoss", "arkansas", "arkansas-river", "ckan", "electromagnetic-surveying", "electromagnetics", "engineering-sciences", "environment", "geo", "geologic-structure", "geology-geophysics-and-geochemistry-science-center", "geophysics", "geoscientificinformation", "geospatial-datasets", "geoss", "gggsc", "groundwater", "hydrogeology", "hydrology", "illinois", "louisiana", "magnetic-field", "magnetics", "mississippi", "mississippi-alluvial-plain", "mississippi-river", "mississippi-river-valley-alluvial-aquifer", "missouri", "mrva", "national", "new-madrid-seismic-zone", "north-america", "potassium", "radiometrics", "resistivity", "shellmound", "tennessee", "thorium", "u-s-geological-survey", "united-states", "uranium", "usgs", "usgs-5f4e954682ce4c3d1233cb84", "water-availability-and-use-science-program", "water-resources", "wausp" ; dcat:theme <%7Bgeospatial%7D> . a dcat:Distribution ; dct:description "Landing page for access to the data" ; dct:format "XML" ; dct:issued "2022-07-28T20:51:04.690588"^^xsd:dateTime ; dct:modified "2025-11-23T00:00:17.027470"^^xsd:dateTime ; dct:title "Digital Data" ; dcat:accessURL ; dcat:mediaType "application/http" . a dcat:Distribution ; dct:description "The metadata original format" ; dct:format "XML" ; dct:issued "2022-07-28T20:51:04.690576"^^xsd:dateTime ; dct:modified "2025-11-23T00:00:17.026999"^^xsd:dateTime ; dct:title "Original Metadata" ; dcat:accessURL ; dcat:mediaType "text/xml" . a foaf:Agent ; foaf:name "US Migrating" .