@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix gsp: <http://www.opengis.net/ont/geosparql#> .
@prefix locn: <http://www.w3.org/ns/locn#> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://data.amerigeoss.org/dataset/51558be2-d06e-4593-a196-e0ea3ac1cc22> a dcat:Dataset ;
    dct:description """This is a tiled collection of the 3D Elevation Program (3DEP) and is 1/3 arc-second
        (approximately 10 m) resolution.The 3DEP data holdings serve as the elevation layer of The
        National Map, and provide foundational elevation information for earth science studies and
        mapping applications in the United States. Scientists and resource managers use 3DEP data
        for hydrologic modeling, resource monitoring, mapping and visualization, and many other
        applications. The elevations in this DEM represent the topographic bare-earth surface. The
        seamless 1/3 arc-second DEM layers are derived from diverse source data that are processed
        to a common coordinate system and unit of vertical measure. These data are distributed in
        geographic coordinates in units of decimal degrees, and in conformance with the North
        American Datum of 1983 (NAD 83). All elevation values are in meters and, over the
        continental United States, are referenced to the North American Vertical Datum of 1988
        (NAVD88). The seamless 1/3 arc-second DEM layer provides coverage of the conterminous United
        States, Hawaii, Puerto Rico, other territorial islands, and in limited areas of Alaska. The
        seamless 1/3 arc-second DEM is available as pre-staged products tiled in 1 degree blocks in
        Erdas .img, ESRI arc-grid, and grid float formats. The seamless 1/3 arc-second DEM layer is
        updated continually as new data become available. Other 3DEP products are nationally
        seamless DEMs in resolutions of 1, and 2 arc seconds. 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. """ ;
    dct:identifier "USGS:3a81321b-c153-416f-98b7-cc8e5f0e17c3" ;
    dct:issued "2025-11-21T16:24:51.866309"^^xsd:dateTime ;
    dct:modified "20201113"^^xsd:gYear ;
    dct:publisher <https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> ;
    dct:spatial [ a dct:Location ;
            locn:geometry "POLYGON ((-170.8500 -14.3833, -170.8500 72.0000, 163.0666 72.0000, 163.0666 -14.3833, -170.8500 -14.3833))"^^gsp:wktLiteral ] ;
    dct:title """1/3rd arc-second Digital Elevation Models (DEMs) - USGS National Map 3DEP
          Downloadable Data Collection""" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "U.S. Geological Survey" ;
            vcard:hasEmail <mailto:tnm_help@usgs.gov> ] ;
    dcat:distribution <https://data.amerigeoss.org/dataset/51558be2-d06e-4593-a196-e0ea3ac1cc22/resource/cf913b47-2986-4e21-ba61-ffb98379168e> ;
    dcat:keyword "1-3-arc-second-dem",
        "1-degree-dem",
        "3dep",
        "amerigeo",
        "amerigeoss",
        "bare-earth",
        "cartography",
        "ckan",
        "dem",
        "digital-elevation-model",
        "digital-mapping",
        "digital-terrain-model",
        "elevation",
        "elevation-theme",
        "geo",
        "geodata",
        "geoss",
        "gis",
        "grid",
        "high-resolution",
        "hydro-flattened",
        "ifsar",
        "interferometric-synthetic-aperture-radar",
        "lidar",
        "light-detection-and-ranging",
        "mapping",
        "national",
        "national-elevation-dataset",
        "national-geospatial-data-asset",
        "ned",
        "ngda",
        "north-america",
        "raster",
        "terrain-elevation",
        "topographic-surface",
        "topography",
        "u-s-geological-survey",
        "united-states",
        "us",
        "usgs",
        "usgs-3a81321b-c153-416f-98b7-cc8e5f0e17c3" ;
    dcat:theme <%7Bgeospatial%7D> .

<https://data.amerigeoss.org/dataset/51558be2-d06e-4593-a196-e0ea3ac1cc22/resource/cf913b47-2986-4e21-ba61-ffb98379168e> a dcat:Distribution ;
    dct:description "The metadata original format" ;
    dct:format "XML" ;
    dct:issued "2022-08-07T10:08:28.849683"^^xsd:dateTime ;
    dct:modified "2025-11-21T16:24:51.846091"^^xsd:dateTime ;
    dct:title "Original Metadata" ;
    dcat:accessURL <https://data.usgs.gov/datacatalog/metadata/USGS.3a81321b-c153-416f-98b7-cc8e5f0e17c3.xml> ;
    dcat:mediaType "text/xml" .

<https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> a foaf:Agent ;
    foaf:name "US Migrating" .