{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Erick Burns", "hasEmail": "mailto:eburns@usgs.gov"}, "description": "The wntop_f grid represents the modeled elevation of the top of the Wanapum Basalt geomodel unit \nat a 500 foot resolution. It is one grid of a geomodel that consists of eleven grids and a spatial extent \npolygon shapefile.  As part of a U.S. Geological Survey Groundwater Resources Program study, a \nthree-dimensional geomodel was constructed for approximately 53,000 mi2 of the Columbia Plateau \nin Washington, Oregon, and Idaho. This geomodel was constructed to define the general aquifer \nsystem geometry for use in a regional numerical groundwater flow model. Simplifications and \nassumptions consistent with this ultimate goal and the uncertainty in the available data were made. \nThe geomodel units consist of Miocene age Columbia River Basalt Group strata and younger alluvial \noverburden covering approximately 44,000 mi2. Data were compiled from numerous databases and \ndetailed studies completed during the past three decades. These data include stratigraphic \ninterpretations made on more than 13,000 wells and a contiguous compilation of surficial geology \nand structural features spanning the study area. These data were simplified and used to construct \npiecewise-smooth trend surfaces that represent upper and lower subsurface geomodel unit boundaries \nin this complex folded and faulted terrain.  The smoothness of the surfaces implicitly represents \nuncertainty in prediction of each surface resulting from data gaps, errors in borehole interpretations, \nerrors in mapped contact locations, and uncertainty in the shape of the paleo-surface upon which \nflood basalts were emplaced. Using a rule-based algorithm, surfaces were then recombined to \nconstruct a fully three-dimensional model with a 500-foot grid resolution that is consistent with the \ndata and for which error estimates may be made. The modeling process yielded improved estimates \nof unit volumes, refinement of location of large structural features, and identification of features that \nmay be important for ongoing groundwater studies.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P927LTPO", "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.5c2e8f88-cc6d-45d8-b360-1eafea8901fc.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_5c2e8f88-cc6d-45d8-b360-1eafea8901fc", "keyword": ["CPRAS", "Columbia Plateau", "Columbia Plateau Regional Aquifer System", "Columbia River Basalt", "Columbia River Basin", "Idaho", "Oregon", "Pacific Northwest", "USGS:5c2e8f88-cc6d-45d8-b360-1eafea8901fc", "Wanapum Basalt", "Washington", "geomodel", "inlandWaters"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-121.844957854, 44.261075488, -115.367389272, 48.419366654", "theme": ["geospatial"], "title": "Modeled Top of the Wanapum Basalt Geomodel Unit (wntop_f)"}