# National Elevation Dataset 10 Meter 7.5x7.5 minute quadrangles

Metadata also available as

## Metadata:

- Identification_Information
- Data_Quality_Information
- Spatial_Data_Organization_Information
- Spatial_Reference_Information
- Entity_and_Attribute_Information
- Distribution_Information
- Metadata_Reference_Information

Identification_Information:
  Citation:
    Citation_Information:
      Originator:
        U.S. Department of Agriculture (USDA) Natural Resources Conservation Services, National Cartography & Geospatial Center
      Originator:
        U.S. Department of Agriculture, Natural Resources Conservation Service, National Cartography & Geospatial Center
      Publication_Date: Unknown
      Title: National Elevation Dataset 10 Meter 7.5x7.5 minute quadrangles
      Edition: 1
      Geospatial_Data_Presentation_Form: raster digital data
      Publication_Information:
        Publication_Place: Fort Worth, TX
        Publisher: National Cartography & Geospatial Center
      Online_Linkage: <http://datagateway.nrcs.usda.gov>
  Description:
    Abstract:
      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. 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 a consistent datum, edge-match, fill slivers of missing data at quadrangle seams, recast the data to a consistent geographic projection and convert all elevation values to decimal meters as a consistent unit of measure.
      NED has a resolution of one-third arc-second (approximately 10 meters) for much of the conterminous United States, Hawaii and Puerto Rico in a NAD83 datum. There is a resolution of two arc-seconds for Alaska and the datum is NAD27.
      NED at 10 meters is created using the same methods outlined above with the source data being mostly the 10m DEMs. DEMs at 5 meters, 1/3 arc-second, and 1/9 arc-second maps are also used where available. In some cases, the 10m NED is resampled from LIDAR or created using aerial photography.
      One of the effects of the NED processing steps is a much-improved base of elevation data for calculating slope and hydrologic derivatives. Artifact removal greatly improves the quality of the slope, shaded-relief, and synthetic drainage information that can be derived from the elevation data. Geospatial elevation data are used by the scientific and resource management communities for global change research, hydrologic modeling, resource monitoring, mapping, and visualization applications.
      NRCS has elected to ONLY serve NED 10 which is 10 meter or better and not NED 10 which was resampled from 30 meter. NRCS also serves the maps in a UTM projection. These two facts differentiate the maps from those served at http://seamless.usgs.gov/.
    Purpose:
      Geospatial elevation data are utilized by the scientific and resource management communities for global change research, hydrologic modeling, soils mapping, resource monitoring, mapping, and visualization applications.
  Time_Period_of_Content:
    Time_Period_Information:
      Range_of_Dates/Times:
        Beginning_Date: unknown
        Ending_Date: unknown
    Currentness_Reference: publication date
  Status:
    Progress: In work
    Maintenance_and_Update_Frequency: As needed
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -124.7333
      East_Bounding_Coordinate: -067.9500
      North_Bounding_Coordinate: 49.3833
      South_Bounding_Coordinate: 24.5333
  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: 7.5x7.5 minute 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
      Theme_Keyword: NRCS
      Theme_Keyword: NCGC
      Theme_Keyword: Gateway
    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.
  Point_of_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: National Cartography & Geospatial Center
      Contact_Address:
        Address_Type: mailing address
        Address: USDA Natural Resources Conservation Service
        Address: National Cartography & Geospatial Center
        Address: 501 W. Felix St.
        City: Fort Worth
        State_or_Province: Texas
        Postal_Code: 76115
        Country: United States
      Contact_Voice_Telephone: 817-509-3400
      Contact_Facsimile_Telephone: 817-509-3469
  Native_Data_Set_Environment:
    Microsoft Windows NT Version 4.0 (Build 1381) Service Pack 6; ESRI ArcCatalog 8.1.0.642

Data_Quality_Information:
  Logical_Consistency_Report: Not Applicable.
  Completeness_Report:
    Review of shaded relief for completness of data and verifies mosaic and reprojection was run properly.
  Lineage:
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: U.S. Geological Survey (USGS), EROS Data Center
          Publication_Date: Unknown
          Title: National Elevation Dataset
          Online_Linkage: <http://edcnts12.cr.usgs.gov/ned/ned.html>
      Type_of_Source_Media: FTP download
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Range_of_Dates/Times:
            Beginning_Date: unknown
            Ending_Date: unknown
      Source_Citation_Abbreviation: NED
      Source_Contribution:
        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.
    Process_Step:
      Process_Description:
        The data is acquired from USGS as Oracle Transportable Tablespaces. It is loaded to NCGC SDE servers and extracted in a UTM projection by gateway ArcObjects services.
      Process_Date: Refer to metadata information

Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Raster
  Raster_Object_Information:
    Raster_Object_Type: Grid Cell
    Row_Count: varies
    Column_Count: varies

Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Planar:
      Grid_Coordinate_System:
        Grid_Coordinate_System_Name: Universal Transverse Mercator
        Universal_Transverse_Mercator:
          UTM_Zone_Number: 10-19
          Transverse_Mercator:
            Scale_Factor_at_Central_Meridian: 0.999600
            Longitude_of_Central_Meridian: varies
            Latitude_of_Projection_Origin: 0.000000
            False_Easting: 500000.000000
            False_Northing: 0.000000
      Planar_Coordinate_Information:
        Planar_Coordinate_Encoding_Method: coordinate pair
        Coordinate_Representation:
          Abscissa_Resolution: 10.000000
          Ordinate_Resolution: 10.000000
        Planar_Distance_Units: meters
    Geodetic_Model:
      Horizontal_Datum_Name: North American Datum of 1983
      Ellipsoid_Name: Geodetic Reference System 80
      Semi-major_Axis: 6378137.000000
      Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:
  Overview_Description:
    Entity_and_Attribute_Overview:
      ArcInfo Grid - Cell Size: one arc-second Data type: floating point Number of Rows: varies Number of Lines: varies Projection: UTM Datum: NAD83 Horizontal Units: meters Zunits: meters

      ArcView Shapefile - Three File Types: .dbf. shp. shx, prj

      Enhanced Shaded Relief - tif and tfw files as geotiff

      ned30m_metadata.xml ned30m_metadata.html ned30m_readme.txt USGS_NED10m_factsheet.pdf

    Entity_and_Attribute_Detail_Citation:
      U.S. Department of the Interior, U.S. Geological Survey, 1998, Standards for Digital Elevation Models: Reston, VA.

      Softcopy in Adobe Acrobat Portable Document File (PDF) format: <http://rockyweb.cr.usgs.gov/nmpstds/demstds.html>

Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: National Cartography & Geospatial Center
        Contact_Person: Customer Services Representative
      Contact_Address:
        Address_Type: mailing and physical address
        Address: Natural Resources Conservation Service
        Address: National Cartography & Geospatial Center
        Address: 501 Felix St., Bldg 23
        City: Fort Worth
        State_or_Province: Texas
        Postal_Code: 76115
        Country: USA
      Contact_Voice_Telephone: 817-509-3400
      Contact_Facsimile_Telephone: 817-509-3469
  Resource_Description: National Elevation Dataset (NED)
  Distribution_Liability:
    Although these data have been processed successfully on a computer system at the U.S. Department of Agriculture, no warranty expressed or implied is made by the Agency regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. The U.S. Department of Agriculture, nor any of its agencies are liable for misuse of the data, for damage, for transmission of viruses, or for computer contamination through the distribution of these data sets. The U.S. Department of Agriculture prohibits discrimination in its programs on the basis of race, color, national origin, sex, religion, age, disability, political beliefs, and marital or familial status. (Not all prohibited bases apply to all programs.)
  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: GEOTIFF
        Format_Specification: Geotif image format
        File_Decompression_Technique: tar and gzip
        Transfer_Size: between 1-107 MB
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: Geospatial Data Gateway
          Online_Computer_and_Operating_System: <http://datagateway.nrcs.usda.gov>
        Offline_Option:
          Offline_Media: CD-ROM
          Recording_Capacity:
            Recording_Density: 650
            Recording_Density_Units: MB
          Recording_Format: ISO 9660, Level 2, Mode 1
    Fees: $50 per CD-ROM
    Ordering_Instructions:
      Two processes for obtaining data. Free by ftp or charge if by CD-ROM.
  Available_Time_Period:
    Time_Period_Information:
      Single_Date/Time:
        Calendar_Date: unknown

Metadata_Reference_Information:
  Metadata_Date: 20011120
  Metadata_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: National Cartography & Geospatial Center
        Contact_Person: Customer Services Representative
      Contact_Address:
        Address_Type: mailing and physical address
        Address: Natural Resources Conservation Service
        Address: National Cartography & Geospatial Center
        Address: 501 Felix St. Bldg 23
        City: Fort Worth
        State_or_Province: Texas
        Postal_Code: 76115
        Country: USA
      Contact_Voice_Telephone: 817-509-3400
      Contact_Facsimile_Telephone: 817-509-3469
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Time_Convention: local time
  Metadata_Extensions:
    Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
    Profile_Name: ESRI Metadata Profile

Generated by `mp` version 2.7.33 on Wed Apr 07 17:43:35 2004