{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Erick Burns", "hasEmail": "mailto:eburns@usgs.gov"}, "description": "The wnthk_f grid represents the modeled combined thickness of the Wanapum Basalt and the \nVantage/Latah interbed geomodel units at a 500 foot resolution. It is one grid of a geomodel that \nconsists of eleven grids and a spatial extent polygon shapefile.  As part of a U.S. Geological \nSurvey Groundwater Resources Program study, a three-dimensional geomodel was constructed \nfor approximately 53,000 mi2 of the Columbia Plateau in Washington, Oregon, and Idaho. This \ngeomodel was constructed to define the general aquifer system geometry for use in a regional \nnumerical groundwater flow model. Simplifications and assumptions consistent with this ultimate \ngoal and the uncertainty in the available data were made. The geomodel units consist of Miocene \nage Columbia River Basalt Group strata and younger alluvial overburden covering approximately \n44,000 mi2. Data were compiled from numerous databases and detailed studies completed during \nthe past three decades. These data include stratigraphic interpretations made on more than 13,000 \nwells and a contiguous compilation of surficial geology and structural features spanning the study \narea. These data were simplified and used to construct piecewise-smooth trend surfaces that \nrepresent upper and lower subsurface geomodel unit boundaries in this complex folded and faulted \nterrain.  The smoothness of the surfaces implicitly represents uncertainty in prediction of each surface \nresulting from data gaps, errors in borehole interpretations, errors in mapped contact locations, and \nuncertainty in the shape of the paleo-surface upon which flood basalts were emplaced. Using a \nrule-based algorithm, surfaces were then recombined to construct a fully three-dimensional model \nwith a 500-foot grid resolution that is consistent with the data and for which error estimates may be \nmade. The modeling process yielded improved estimates of unit volumes, refinement of location of \nlarge structural features, and identification of features that may be important for ongoing groundwater \nstudies.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9TEIIJG", "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.0644ecb0-89c0-4f90-bc4c-55ac80ccb4e2.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_0644ecb0-89c0-4f90-bc4c-55ac80ccb4e2", "keyword": ["CPRAS", "Columbia Plateau", "Columbia Plateau Regional Aquifer System", "Columbia River Basalt", "Columbia River Basin", "Idaho", "Oregon", "Pacific Northwest", "USGS:0644ecb0-89c0-4f90-bc4c-55ac80ccb4e2", "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": "Combined Thickness of the Modeled Wanapum Basalt and Vantage-Latah Interbed Geomodel Units (wnthk_f)"}