{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Michael E. Wieczorek", "hasEmail": "mailto:mewieczo@usgs.gov"}, "description": "This data set represents the average population density, in number of people per square \nkilometer multiplied by 10 for the year 2000, compiled for every catchment of NHDPlus for \nthe conterminous United States. The source data set is the 2000 Population Density by \nBlock Group for the Conterminous United States (Hitt, 2003).\n\t\t\nThe NHDPlus Version 1.1 is an integrated suite of application-ready geospatial datasets \nthat incorporates many of the best features of the National Hydrography Dataset (NHD) \nand the National Elevation Dataset (NED). The NHDPlus includes a stream network \n(based on the 1:100,00-scale NHD), improved networking, naming, and value-added \nattributes (VAAs). NHDPlus also includes elevation-derived catchments (drainage areas) \nproduced using a drainage enforcement technique first widely used in New England, and \nthus referred to as \"the New England Method.\" This technique involves \"burning in\" the \n1:100,000-scale NHD and when available building \"walls\" using the National Watershed \nBoundary Dataset (WBD). The resulting modified digital elevation model (HydroDEM) is \nused to produce hydrologic derivatives that agree with the NHD and WBD. Over the past \ntwo years, an interdisciplinary team from the U.S. Geological Survey (USGS), and the \nU.S. Environmental Protection Agency (USEPA), and contractors, found that this method \nproduces the best quality NHD catchments using an automated process (USEPA, 2007). \nThe NHDPlus dataset is organized by 18 Production Units that cover the conterminous \nUnited 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, \ncovering the South Atlantic-Gulf and Tennessee River basins, contains NHDPlus \nProduction Units 3 and 6.  MRB3, covering the Great Lakes, Ohio, Upper Mississippi, \nand Souris-Red-Rainy River basins, contains NHDPlus Production Units 4, 5, 7 and 9.  \nMRB4, covering the Missouri River basins, contains NHDPlus Production Units 10-lower \nand 10-upper.  MRB5, covering the Lower Mississippi, Arkansas-White-Red, and \nTexas-Gulf River basins, contains NHDPlus Production Units 8, 11 and 12.  MRB6, \ncovering the Rio Grande, Colorado and Great Basin River basins, contains NHDPlus \nProduction Units 13, 14, 15 and 16.  MRB7, covering the Pacific Northwest River basins, \ncontains NHDPlus Production Unit 17.  MRB8, covering California River basins, contains \nNHDPlus Production Unit 18.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P95P9DCL", "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.d26914e4-b7ee-4c56-9c3a-988a2dadaf5c.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_d26914e4-b7ee-4c56-9c3a-988a2dadaf5c", "keyword": ["CALI", "COGB", "California", "Catchment", "Conterminous United States", "GLMR", "Great Lakes, Ohio, Upper Mississippi, and Souris-Red-Rainy", "Inlandwaters", "LMTG", "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", "Population Density", "Rio Grande, Colorado, and Great Basin", "SAGT", "SPARROW", "South Atlantic-Gulf and Tennessee", "USGS:d26914e4-b7ee-4c56-9c3a-988a2dadaf5c", "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: Population Density, 2000"}