{
  "@type": "dcat:Dataset",
  "accessLevel": "public",
  "contactPoint": {
    "@type": "vcard:Contact",
    "fn": "DCGISgroup",
    "hasEmail": "mailto:gisgroup@dc.gov"
  },
  "description": "<div style='text-align:Left;'><div><div><p><span>The hydro-flattened bare earth DEM was generated using the 2018 DC lidar bare earth points and 3D hydro breaklines to a resolution of 1 m. The bare earth points that fell within 1NPS along the hydro breaklines were excluded from the DEM generation process and put into class 20 – ignored ground. This is analogous to the removal of mass points for the same reason in a traditional photogrammetrically compiled DTM. This process was done in batch using proprietary software. The technicians then used proprietary software for the production of the lidar-derived hydro-flattened bare earth DEM surface in initial grid format at 1 m GSD. Water bodies (inland ponds and lakes), inland streams and rivers, and island holes were hydro-flattened within the DEM. Once the initial, hydro-flattened bare earth DEM was generated, the tiles were checked to ensure that the grid spacing met specifications. The surface was also checked to ensure proper hydro-flattening.This dataset provided as an ArcGIS Image service. Please note, the download feature for this image service in Open Data DC provides a compressed PNG, JPEG or TIFF. The compressed GeoTIFF raster dataset is available under additional options when viewing downloads.</span></p></div></div></div>",
  "distribution": [
    {
      "@type": "dcat:Distribution",
      "accessURL": "https://imagery.dcgis.dc.gov/dcgis/rest/services/Lidar/Hydro_Enforced_DTM_2018/ImageServer",
      "format": "ArcGIS GeoServices REST API",
      "mediaType": "application/json",
      "title": "ArcGIS GeoService"
    },
    {
      "@type": "dcat:Distribution",
      "accessURL": "https://opendata.dc.gov/datasets/DCGIS::2018-lidar-hydro-enforced-digital-terrain-model",
      "format": "Web Page",
      "mediaType": "text/html",
      "title": "ArcGIS Hub Dataset"
    }
  ],
  "identifier": "https://www.arcgis.com/home/item.html?id=288c927005c84e768a57b0212c2700a6",
  "issued": "2019-11-06T14:58:06.000Z",
  "keyword": [
    "DC",
    "District of Columbia",
    "Washington DC",
    "bare earth",
    "dem",
    "digital elevation model",
    "dtm",
    "elevation",
    "hydro-enforced",
    "hydro-flattened",
    "lidar",
    "lidar2018"
  ],
  "landingPage": "https://opendata.dc.gov/datasets/DCGIS::2018-lidar-hydro-enforced-digital-terrain-model",
  "license": "https://creativecommons.org/licenses/by/4.0",
  "modified": "2022-11-28T19:11:59.000Z",
  "publisher": {
    "name": "D.C. Office of the Chief Technology Officer"
  },
  "spatial": "-77.1220,38.7855,-76.9007,39.0017",
  "theme": [
    "geospatial"
  ],
  "title": "2018 LiDAR - Hydro Enforced Digital Terrain Model"
}