{"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 geophysical \nsurveys for areas of the North and South Platte River valleys and Lodgepole Creek in western \nNebraska. The objective of the surveys was to map the aquifers and bedrock topography of \nselected areas to help improve the understanding of groundwater-surface-water relationships \nto be used in water management decisions. Frequency-domain (2008 and 2009) and time-domain \n(2010) helicopter electromagnetic surveys were completed, using a unique survey flight line design,\n to collect resistivity data that can be related to lithologic information for refinement of groundwater \nmodel inputs.  To make the geophysical data useful to multidimensional groundwater models, \nnumerical inversion is necessary to convert the measured data into a depth-dependent subsurface \nresistivity model.  This inversion model, in conjunction with sensitivity analysis, geological ground \ntruth (boreholes), and geological interpretation, is used to characterize hydrogeologic features.  \nThe two- and three- dimensional interpretation provides the groundwater modeler with a high-\nresolution hydrogeologic framework and a quantitative estimate of framework uncertainty.  This \nmethod of creating hydrogeologic frameworks improved the understanding of the actual flow path \norientation by redefining the location of the paleochannels and associated bedrock highs. The \nimproved models represent the hydrogeology at a level of accuracy not achievable using previous \ndata sets.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9F3GEZS", "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.871ff919-bae0-456a-ac5d-71960747d36d.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_871ff919-bae0-456a-ac5d-71960747d36d", "keyword": ["Nebraska", "Ogallala", "Scottsbluff", "Sidney", "USGS:871ff919-bae0-456a-ac5d-71960747d36d", "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": "Elevation Control Points to reinterpret the base of aquifer contours after airborne electromagnetic (AEM) surveys of the principal aquifer for portions of the North Platte, South Platte, and Twin Platte Natural Resources Districts, western Nebraska"}