@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/25dc6edd-4c43-4692-b474-90921bc33b45> a dcat:Dataset ;
    dct:description """This is a tiled collection of the 3D Elevation Program (3DEP) and is 1/9 arc-second
        (approximately 3 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 1/9 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 1/9 arc-second DEM layer project-based coverage for portions of the
        conterminous United States, limited areas of Alaska, and Guam. The seamless 1/9 arc-second
        NED layer is available as pre-staged products tiled in 15 minute blocks in Erdas .img
        format. Since 2015, the seamless 1/9 arc-second DEM layer is no longer being updated. Other
        3DEP products are nationally seamless DEMs in resolutions of 1/3, 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:40e52270-5c4b-497d-987f-827e374becff" ;
    dct:issued "2025-11-20T13:03:40.029693"^^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 ((-155.8338 13.2320, -155.8338 69.6953, 144.9578 69.6953, 144.9578 13.2320, -155.8338 13.2320))"^^gsp:wktLiteral ] ;
    dct:title """1/9th 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/25dc6edd-4c43-4692-b474-90921bc33b45/resource/816de6b1-6b9e-4ac8-97b9-d2945e7d024d> ;
    dcat:keyword "1-9-arc-second-dem",
        "15-minute-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-40e52270-5c4b-497d-987f-827e374becff" ;
    dcat:theme <%7Bgeospatial%7D> .

<https://data.amerigeoss.org/dataset/25dc6edd-4c43-4692-b474-90921bc33b45/resource/816de6b1-6b9e-4ac8-97b9-d2945e7d024d> a dcat:Distribution ;
    dct:description "The metadata original format" ;
    dct:format "XML" ;
    dct:issued "2022-08-07T10:00:13.178793"^^xsd:dateTime ;
    dct:modified "2025-11-20T13:03:40.009582"^^xsd:dateTime ;
    dct:title "Original Metadata" ;
    dcat:accessURL <https://data.usgs.gov/datacatalog/metadata/USGS.40e52270-5c4b-497d-987f-827e374becff.xml> ;
    dcat:mediaType "text/xml" .

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