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    • Source: National Elevation Dataset

      • The National Elevation Dataset (NED) consists of high precision topography or ground surface elevation data (digital elevation model) for the United States. It was maintained by the USGS and all the data is in the public domain. Since the 3D Elevation Program came online, the NED was subsumed into The National Map as one of its layers of information.


      Sources


      The NED dataset is a compilation of data from a variety of existing high-precision datasets such as LiDAR data (see also National LIDAR Dataset - USA), contour maps, USGS DEM collection, SRTM and other sources which were reorganized and combined into a seamless dataset, designed to cover all the United States territory in its continuity.


      Formats


      Data is available in a few popular formats such as ESRI ArcGRID, GeoTIFF, BIL, GridFloat, and a few others.
      A version of the NED called EDNA (Elevation Derivatives for National Applications) has been processed or "conditioned" for hydrologic applications. This is useful for hydrologic modeling, watershed delineation, or finding downstream flowpaths, "facilitating flood analysis investigations, pollution studies, estimations of annual streamflow, and hydroelectric power generation."


      Precision


      Depending on area location, the datasets are provided with 1/9 (about 3 meters), 1/3 (about 10 m) and 1-arcsecond (about 30 m) precision.


      References




      External links


      Elevation data in The National Map
      Shaded Relief Maps of the United States

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    Artikel Terkait "national elevation dataset"

    The National Elevation Dataset | U.S. Geological Survey - USGS.gov

    01 Des 2018 · The NED provides seamless raster elevation data of the conterminous United States (CONUS), Alaska, Hawaii, U.S. island territories, Mexico, and Canada. The NED is derived from diverse source datasets that are processed to a specification with consistent resolutions, coordinate system, elevation units, and horizontal and vertical datums.

    GIS Data Download | U.S. Geological Survey - USGS.gov

    The vector datasets include: The National Hydrography Dataset(s), Watershed Boundary Dataset, Governmental Boundary Units, Transportation, Structures, Elevation Contours and Geographic Names. Raster datasets include: Digital Elevation Models (DEMs), Orthoimagery, and …

    National Elevation Dataset (NED) - USDA

    The U.S. Geological Survey has developed a National Elevation Database (NED).The NED is a seamless mosaic of best-available elevation data. The 7.5-minute elevation data for the conterminous United States are the primary initial source data.

    Datasets - The National Map

    The National Elevation Dataset (NED) is the primary elevation data product produced and distributed by the USGS. The NED provides seamless raster elevation data of the conterminous United States, Alaska, Hawaii, and the island territories.

    National Elevation Dataset | U.S. Geological Survey - USGS.gov

    01 Nov 1999 · The National Elevation Dataset (NED) is a new raster product assembled by the U.S. Geological Survey (USGS). The NED is designed to provide national elevation data in a seamless form with a consistent datum, elevation unit, and projection.

    National Elevation Dataset - USGS Publications Warehouse

    The National Elevation Dataset (NED) is a new raster product assembled by the U.S. Geological Survey (USGS). The NED is designed to provide national elevation data in a seamless form with a consistent datum, elevation unit, and projection.

    Digital Elevation Dataset (30-meter NED) - West Virginia University

    The National Elevation Dataset (NED) is a new raster product assembled by the U.S. Geological Survey. The NED is a seamless mosaic of best-available elevation data with a consistent datum, elevation unit, and projection.

    The national elevation data set - USGS Publications Warehouse

    The NED is a seamless raster dataset from the USGS that fulfills many of the concepts of framework geospatial data as envisioned for the NSDI, allowing users to focus on analysis rather than data preparation.

    National Elevation Dataset - Wikipedia

    The National Elevation Dataset (NED) consists of high precision topography or ground surface elevation data (digital elevation model) for the United States. It was maintained by the USGS and all the data is in the public domain .

    ArcGIS Web Application - The National Map

    USGS The National Map: National Boundaries Dataset, 3DEP Elevation Program, Geographic Names Information System, National Hydrography Dataset, National Land Cover Database, National Structures Dataset, and National Transportation Dataset; USGS Global Ecosystems; U.S. Census Bureau TIGER/Line data; USFS Road data; Natural Earth Data; U.S. Department …