{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Erick Burns", "hasEmail": "mailto:eburns@usgs.gov"}, "description": "The smtop_f grid represents the modeled elevation of the top of the Saddle Mountains Basalt \ngeomodlel unit at a 500 foot resolution. It is one grid of a geomodel that consists of eleven grids \nand a spatial extent polygon shapefile.  As part of a U.S. Geological Survey Groundwater \nResources Program study, a three-dimensional geomodel was constructed for approximately \n53,000 mi2 of the Columbia Plateau in Washington, Oregon, and Idaho. This geomodel was \nconstructed to define the general aquifer system geometry for use in a regional numerical \ngroundwater flow model. Simplifications and assumptions consistent with this ultimate goal \nand 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 \nduring the past three decades. These data include stratigraphic interpretations made on more \nthan 13,000 wells and a contiguous compilation of surficial geology and structural features \nspanning the study area. These data were simplified and used to construct piecewise-smooth \ntrend surfaces that represent upper and lower subsurface geomodel unit boundaries in this \ncomplex 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 \nthe data and for which error estimates may be made. The modeling process yielded improved \nestimates of unit volumes, refinement of location of large structural features, and identification \nof features that may be important for ongoing groundwater studies.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9UEQ2KM", "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.a3a55e70-df03-4006-985e-3a146a1dc141.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_a3a55e70-df03-4006-985e-3a146a1dc141", "keyword": ["CPRAS", "Columbia Plateau", "Columbia Plateau Regional Aquifer System", "Columbia River Basalt", "Columbia River Basin", "Idaho", "Oregon", "Pacific Northwest", "Saddle Mountains Basalt", "USGS:a3a55e70-df03-4006-985e-3a146a1dc141", "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 Saddle Mountains Basalt Geomodel Unit (smtop_f)"}