{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "David L Blodgett", "hasEmail": "mailto:dblodgett@usgs.gov"}, "description": "This dataset contains the initial 3D Hydrography Program (3DHP) flow network topology, which is based on the final High Resolution National Hydrography Dataset (NHD), and a set of mainstem river identifiers based on the Medium resolution NHDPlus Version 2 (NHDPlusV2). The 3DHP flow network topology and mainstem identifiers contained in this data release add two key pieces of information to the flow table of the National Hydrography Dataset:\n1) at every junction, one and only one main upstream and downstream connection has been identified\n2) every \"in network\" flowline has been assigned a mainstem identifier that places it into a hierarchy of rivers and drainage basins.\nFor description of 1 and 2 and additional background, see supplemental information.\nFiles included:\n- HU6_mainstem_outlets.geojson\nOutlet locations of six-digit hydrologic units along mainstem network.\n- nhd_3dhp_conus_mainstems.zip\nZipped table in Comma Separated Values (csv) format containing NHD permanent identifiers and mainstem Uniform Resource Identifiers (URIs) for the Contiguous United States (CONUS).\n- nhd_3dhp_conus_flownetwork.zip\nZipped csv table containing from / to NHD permanent identifiers (from flowline to flowline) and upmain / downmain attributes for CONUS.\n- nhd_3dhp_conus_vpu_membership.zip\nZipped csv table containing NHD permanent identifiers and which Vector Processing Unit (VPU) they belong in.\n- nhd_3dhp_oconus_mainstems.zip\nZipped csv table containing NHD permanent identifiers and mainstem URIs for areas Outside of the Contiguous United States (OCONUS).\n- nhd_3dhp_oconus_flownetwork.zip\nZipped csv table containing from / to NHD permanent identifiers (from flowline to flowline) and upmain / downmain attributes for OCONUS.\n-3dhp_flownetwork.zip\nZipped csv table containing from / to 3DHP identifiers (from flowline to flowline) and upmain / downmain attributes.\n- nhd_3dhp_nonnetwork_mainstems.zip\nZipped csv table containing mainstem identifiers for features not included in the NHD flow table.\n- nhd_final_registry.zip\nZipped csv table containing all expected flowlines from the final NHD -- excludes geometry.\n- nhd_reachcode_mainstem.zip \nZipped csv table containing a mapping between mainstem identifiers and NHD reachcodes.\n- nhd_3dhp_region_connections.zip\nZipped csv table containing connections between vector processing unit regions defined by four-digit hydrologic unit.\n- nhd_3dhp_mainstem_summary.zip\nZipped csv table containing summary information about mainstems contained in nhd_3dhp_conus_mainstems.zip and nhd_3dhp_oconus_mainstems.zip.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P94H0DAG", "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.650cba99d34e823a0273a790.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_650cba99d34e823a0273a790", "keyword": ["Alaska", "Conterminous U.S.", "USGS:650cba99d34e823a0273a790", "inlandWaters"], "modified": "2025-05-20T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-180.0000, 17.5000, -65.0000, 71.3000", "theme": ["geospatial"], "title": "Network attributes for the High Resolution National Hydrography Dataset (NHD) based initial 3D Hydrography Program Network"}