# National Elevation Dataset

## Metadata:

- Identification_Information
- Spatial_Data_Organization_Information
- Distribution_Information
- Metadata_Reference_Information

Identification_Information:
  Citation:
    Citation_Information:
      Originator: U.S. Geological Survey (USGS), EROS Data Center
      Publication_Date: 1999
      Title: National Elevation Dataset
      Edition: 1
      Geospatial_Data_Presentation_Form: raster digital data
      Publication_Information:
        Publication_Place: Sioux Falls, SD
        Publisher: U.S. Geological Survey
      Online_Linkage: <http://gisdata.usgs.net/ned/>
  Description:
    Abstract:
      The U.S. Geological Survey has developed a National Elevation Dataset (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. In addition to the availability of complete 7.5-minute data, efficient processing methods were developed to filter production artifacts in the existing data, convert to the NAD83 datum, edge-match, and fill slivers of missing data at quadrangle seams. One of the effects of the NED processing steps is a much-improved base of elevation data for calculating slope and hydrologic derivatives. The specifications for the NED 1 arc second and 1/3 arc second data are: Geographic coordinate system Horizontal datum of NAD83, except for AK which is NAD27 Vertical datum of NAVD88, except for AK which is NAVD29 Z units of meters
    Purpose:
      Geospatial elevation data are utilized by the scientific and resource management communities for global change research, hydrologic modeling, resource monitoring, mapping, and visualization applications.
    Supplemental_Information:
      (Source DEM information)

      QUADNAME | RESOLUTION | ULLAT | ULLON | LRLAT | LRLON | HDATUM | ZMIN | ZMAX | ZMEAN | ZSIGMA | PMETHOD | QUADDATE
      --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
      | park_city_east_UT | 30 | 40.75 | -111.501 | 40.625 | -111.376 | 27 | 1828.29 | 2548.29 | 2081.51 | 115.027 | 5 | 19991013
      park_city_west_UT | 10 | 40.75 | -111.625 | 40.625 | -111.5 | 83 | 1913.2 | 3058 | 2345.03 | 303.266 | 5 | 20010401
      brighton_UT | 10 | 40.625 | -111.625 | 40.5 | -111.5 | 83 | 1802.35 | 3371.45 | 2609.62 | 296.775 | 5 | 20021201
      heber_city_UT | 10 | 40.625 | -111.5 | 40.5 | -111.375 | 83 | 1663.7 | 2856.6 | 1971.41 | 273.022 | 5 | 20030201

  Time_Period_of_Content:
    Time_Period_Information:
      Range_of_Dates/Times:
        Beginning_Date: 19990201
        Ending_Date: Unknown
    Currentness_Reference: publication date
  Status:
    Progress: In work
    Maintenance_and_Update_Frequency: As needed
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate:-111.55173105
      East_Bounding_Coordinate:-111.46013737
      North_Bounding_Coordinate:40.68137193
      South_Bounding_Coordinate:40.60107615
Keywords:
  Theme:
    Theme_Keyword_Thesaurus: GCMD Parameter Keywords
    Theme_Keyword: EARTH SCIENCE
    Theme_Keyword: LAND SURFACE
    Theme_Keyword: TOPOGRAPHY
    Theme_Keyword: LANDFORMS
    Theme_Keyword: TERRAIN ELEVATION
    Theme_Keyword: 1-DEGREE DEM
    Theme_Keyword: 2-ARC-SECOND DEM
    Theme_Keyword: 7.5-MINUTE DEM
    Theme_Keyword: CARTOGRAPHY
    Theme_Keyword: DEM
    Theme_Keyword: DIGITAL ELEVATION MODEL
    Theme_Keyword: DIGITAL MAPPING
    Theme_Keyword: EDC
    Theme_Keyword: EROS
    Theme_Keyword: GEODATA
    Theme_Keyword: GIS
    Theme_Keyword: MAPPING
    Theme_Keyword: RASTER
    Theme_Keyword: USGS
  Place:
    Place_Keyword_Thesaurus: GCMD Location Keywords
    Place_Keyword: NORTH AMERICA
    Place_Keyword: UNITED STATES
    Place_Keyword: UNITED STATES OF AMERICA
Access_Constraints: None
Use_Constraints:
  None. Acknowledgement of the originating agencies would be appreciated in products derived from these data.

Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Raster

Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Customer Services Representative
        Contact_Organization: EROS Data Center
      Contact_Address:
        Address_Type: mailing and physical address
        Address:
          U.S. Geological Survey EROS Data Center
        City: Sioux Falls
        State_or_Province: SD
        Postal_Code: 57198
        Country: USA
      Contact_Voice_Telephone: 605-594-6151
      Contact_Facsimile_Telephone: 605-594-6589
      Contact_Electronic_Mail_Address: custserv@edcmail.cr.usgs.gov
  Resource_Description: National Elevation Dataset (NED)
  Distribution_Liability:
    Although these data have been processed successfully on a computer system at the U.S. Geological Survey, EROS Data Center, no warranty expressed or implied is made by either regarding the utility of the data on any system, nor shall the act of distribution constitute any such warranty. The USGS will warrant the delivery of this product in computer-readable format and will offer appropriate adjustment of credit when the product is determined unreadable by correctly adjusted computer peripherals, or when the physical medium is delivered in damaged condition. Requests for adjustments of credit must be made within 90 days from the date of this shipment from the ordering site.

Metadata_Reference_Information:
  Metadata_Date: 19990211
  Metadata_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Customer Services Representative
        Contact_Organization: EROS Data Center
      Contact_Address:
        Address_Type: mailing and physical address
        Address:
          U.S. Geological Survey EROS Data Center
        City: Sioux Falls
        State_or_Province: SD
        Postal_Code: 57198
        Country: USA
      Contact_Voice_Telephone: 605-594-6151
      Contact_Facsimile_Telephone: 605-594-6589
      Contact_Electronic_Mail_Address: custserv@edcmail.cr.usgs.gov
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998