{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Michael E. Wieczorek", "hasEmail": "mailto:mewieczo@usgs.gov"}, "description": "This data set represents the estimated area of level 3 ecological landscape regions (ecoregions), \nas defined by Omernik (1987), compiled for every catchment of NHDPlus for the conterminous \nUnited States. The source data set is Level III Ecoregions of the Continental United States \n(U.S. Environmental Protection Agency, 2003).\n\t\t\nThe NHDPlus Version 1.1 is an integrated suite of application-ready geospatial datasets that \nincorporates many of the best features of the National Hydrography Dataset (NHD) and the \nNational Elevation Dataset (NED). The NHDPlus includes a stream network (based on the \n1:100,00-scale NHD), improved networking, naming, and value-added attributes (VAAs). \nNHDPlus also includes elevation-derived catchments (drainage areas) produced using a \ndrainage enforcement technique first widely used in New England, and thus referred to \nas \"the New England Method.\" This technique involves \"burning in\" the 1:100,000-scale \nNHD and when available building \"walls\" using the National Watershed Boundary Dataset \n(WBD). The resulting modified digital elevation model (HydroDEM) is used to produce \nhydrologic derivatives that agree with the NHD and WBD. Over the past two years, an \ninterdisciplinary team from the U.S. Geological Survey (USGS), and the U.S. Environmental \nProtection Agency (USEPA), and contractors, found that this method produces the best \nquality NHD catchments using an automated process (USEPA, 2007). The NHDPlus \ndataset is organized by 18 Production Units that cover the conterminous United States.\n\t\t\nThe NHDPlus version 1.1 data are grouped by the U.S. Geologic Survey's  Major River \nBasins (MRBs, Crawford and others, 2006).  MRB1, covering the New England and \nMid-Atlantic River basins, contains NHDPlus Production Units 1 and 2.  MRB2, covering \nthe South Atlantic-Gulf and Tennessee River basins, contains NHDPlus Production Units \n3 and 6.  MRB3, covering the Great Lakes, Ohio, Upper Mississippi, and Souris-Red-Rainy \nRiver basins, contains NHDPlus Production Units 4, 5, 7 and 9.  MRB4, covering the \nMissouri River basins, contains NHDPlus Production Units 10-lower and 10-upper.  MRB5, \ncovering the Lower Mississippi, Arkansas-White-Red, and Texas-Gulf River basins, contains \nNHDPlus Production Units 8, 11 and 12.  MRB6, covering the Rio Grande, Colorado and \nGreat Basin River basins, contains NHDPlus Production Units 13, 14, 15 and 16.  MRB7, \ncovering the Pacific Northwest River basins, contains NHDPlus Production Unit 17.  MRB8, \ncovering California River basins, contains NHDPlus Production Unit 18.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9GX5O7M", "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.5195c150-c6e6-4a3a-b995-9085f827907a.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_5195c150-c6e6-4a3a-b995-9085f827907a", "keyword": ["CALI", "COGB", "California", "Catchment", "Conterminous United States", "GLMR", "Great Lakes, Ohio, Upper Mississippi, and Souris-Red-Rainy", "Inlandwaters", "LMTG", "Level 3 Ecoregions", "Lower Mississippi, Arkansas-White-Red, and Texas-Gulf", "MORI", "MRB", "MRB1", "MRB2", "MRB3", "MRB4", "MRB5", "MRB6", "MRB7", "MRB8", "Major River Basin", "Missouri", "NAWQA", "NEMA", "NHDPlus", "New England and Mid-Atlantic", "PANW", "Pacific Northwest", "Rio Grande, Colorado, and Great Basin", "SAGT", "SPARROW", "South Atlantic-Gulf and Tennessee", "USGS:5195c150-c6e6-4a3a-b995-9085f827907a", "environment", "geoscientificInformation", "inlandWaters"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-127.910792, 23.243486, -65.327751, 51.657387", "theme": ["geospatial"], "title": "Attributes for NHDPlus Catchments (Version 1.1) for the Conterminous United States: Level 3 Ecoregions"}