{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Chris Hobza", "hasEmail": "mailto:cmhobza@usgs.gov"}, "description": "The U.S. Geological Survey and its partners have collaborated to complete airborne \ngeophysical surveys for areas of the North and South Platte River valleys and \nLodgepole Creek in western Nebraska. The objective of the surveys was to map \nthe aquifers and bedrock topography of selected areas to help improve the \nunderstanding of groundwater-surface-water relationships to be used in water \nmanagement decisions. Frequency-domain (2008 and 2009) and time-domain \n(2010) helicopter electromagnetic surveys were completed, using a unique survey \nflight line design, to collect resistivity data that can be related to lithologic information \nfor refinement of groundwater model inputs.  To make the geophysical data useful for \nmultidimensional groundwater models, numerical inversion is necessary to convert \nthe measured data into a depth-dependent subsurface resistivity model.  This inversion \nmodel, in conjunction with sensitivity analysis, geological ground truth (boreholes), and \ngeological interpretation, is used to characterize hydrogeologic features.  The two- and \nthree- dimensional interpretation provides the groundwater modeler with a high-resolution \nhydrogeologic framework and a quantitative estimate of framework uncertainty.  This \nmethod of creating hydrogeologic frameworks improved the understanding of the actual \nflow path orientation by redefining the location of the paleochannels and associated \nbedrock highs. The improved models represent the hydrogeology at a level of accuracy \nnot achievable using previous data sets.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9CVP0XJ", "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.ca3bce4a-b767-44bc-81a8-826b0c2876aa.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_ca3bce4a-b767-44bc-81a8-826b0c2876aa", "keyword": ["Nebraska", "Ogallala", "Scottsbluff", "Sidney", "USGS:ca3bce4a-b767-44bc-81a8-826b0c2876aa", "environment", "geoscientificInformation", "imageryBaseMapsEarthCover", "inlandWaters"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-102.24, 41.0, -101.25, 41.4", "theme": ["geospatial"], "title": "Area of aquifer contours enhanced with airborne electromagnetic (AEM) surveys of the principal aquifer for portions of the North Platte, South Platte, and Twin Platte Natural Resources Districts, western Nebraska"}