{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Michael D.M. Pace", "hasEmail": "mailto:mpace@usgs.gov"}, "description": "Shallow soil characteristics were mapped near Shellmound, Mississippi, using the DualEM 421 electromagnetic sensor in October 2018. Data were acquired by towing the DualEM sensor on a wheeled cart behind an all-terrain vehicle (ATV), with the sensor at a height of 0.432 meters (m) above the ground surface. Approximately 175 line-kilometers of data were acquired over an area of nearly four square-kilometers, with 25 m separation between survey lines. Data were manually edited for noise sources such as powerlines or other buried structures and averaged to regular output soundings every 5 m along survey lines. The processed data were inverted to recover models of electrical resistivity structure as a function of depth at each sounding location using a spatially constrained inversion. This data release contains the raw and processed data, as well as inverted resistivity models. Model results show typical depth of investigation from about 4 \u2013 6 m, with spatial variability in mapped electrical resistivity characteristic of fluvial deposition of sediments in channels and scroll bar features adjacent to the Tallahatchie River and nearby abandoned meander channels.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9YRT884", "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.5ada594fe4b0e2c2dd297b0a.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_5ada594fe4b0e2c2dd297b0a", "keyword": ["groundwater", "electromagnetic surveying", "environment", "geophysics", "Mississippi", "geospatial datasets", "Tallahatchie River", "water resources", "Leflore County", "electromagnetics", "MRVA", "USGS:5ada594fe4b0e2c2dd297b0a", "hydrogeology", "GGGSC", "dualEM", "geoscientificInformation", "Shellmound", "Mississippi Alluvial Plain", "resistivity", "Mississippi River Valley Alluvial aquifer", "engineering sciences", "Geology, Geophysics, and Geochemistry Science Center"], "modified": "2020-08-20T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-90.31430, 33.57960, -90.26980, 33.61270", "theme": ["geospatial"], "title": "Ground-based electromagnetic survey, Shellmound, Mississippi, October 2018"}