{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "U.S. Geological Survey", "hasEmail": "mailto:whsc_data_contact@usgs.gov"}, "description": "This is a tiled collection of the 3D Elevation Program (3DEP) and is 1 arc-second\n(approximately 30 m) resolution. The elevations in this Digital Elevation Model (DEM)\nrepresent the topographic bare-earth surface. The 3DEP data holdings serve as the\nelevation layer of The National Map, and provide foundational elevation information for\nearth science studies and mapping applications in the United States. Scientists and\nresource managers use 3DEP data for hydrologic modeling, resource monitoring, mapping\nand visualization, and many other applications. The seamless 1 arc-second DEM layers\nare derived from diverse source data that are processed to a common coordinate system\nand unit of vertical measure. These data are distributed in geographic coordinates in\nunits of decimal degrees, and in conformance with the North American Datum of 1983 (NAD\n83). All elevation values are in meters and, over the continental United States, are\nreferenced to the North American Vertical Datum of 1988 (NAVD88). The seamless 1\narc-second DEM layer provides coverage of the conterminous United States, Hawaii, Puerto\nRico, other territorial islands, and much of Alaska and Canada. The seamless 1\narc-second DEM is available as pre-staged current and historical products tiled in GeoTIFF format. The seamless 1 arc-second DEM layer is updated continually as new data become available in the current folder. Previously created 1 degree blocks are retained in the historical folder with an appended date suffix (YYYYMMDD) when they were produced. \nOther 3DEP products are nationally seamless DEMs in resolutions of 1 and 1/3 arc-second. These seamless DEMs were referred to as the National Elevation Dataset (NED) from about 2000 through 2015 at which time they became the seamless DEM layers under the 3DEP program and the NED name and system were retired. Other 3DEP products include one-meter DEMs produced exclusively from high resolution light detection and ranging (lidar) source data and five-meter DEMs in Alaska as well as various source datasets including the lidar point cloud and interferometric synthetic aperture radar (Ifsar) digital surface models and intensity images. All 3DEP products are public domain.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://www.usgs.gov/3d-elevation-program", "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.35f9c4d4-b113-4c8d-8691-47c428c29a5b.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_35f9c4d4-b113-4c8d-8691-47c428c29a5b", "keyword": ["1-Degree DEM", "3D Elevation Program", "3DEP", "Bare Earth", "Cartography", "DEM", "Digital Elevation Model", "Digital Mapping", "Digital Terrain Model", "Elevation", "GIS", "Geodata", "Geographic Information System", "Grid", "High Resolution", "Hydro-Flattened", "IFSAR", "Interferometric Synthetic Aperture Radar", "LIDAR", "Light Detection And Ranging", "Mapping", "NED", "National Elevation Dataset", "Raster", "Terrain Elevation", "Topographic Surface", "Topography", "U.S. Geological Survey", "US", "USGS", "USGS:35f9c4d4-b113-4c8d-8691-47c428c29a5b", "United States", "elevation"], "modified": "2025-02-14T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-170.850136, -14.383195, 163.066531, 84.000000", "theme": ["geospatial"], "title": "1 Arc-second Digital Elevation Models (DEMs) - USGS National Map 3DEP Downloadable Data Collection"}