National Elevation Dataset (ned_55067900)

Metadata:

• Identification_Information
• Data_Quality_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 (ned_55067900)

Edition: 1

Geospatial_Data_Presentation_Form: raster digital data

Publication_Information:

Publication_Place: Sioux Falls, South Dakota

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 North American Datum 1983, 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 Alaska which is North American Datum 27 Vertical datum of North American Vertical Datum 1988, except for Alaska which is North American Vertical Datum 1929 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:

Metadata about the individual source datasets used to assemble NED is presented in a spatially-referenced form (ned_55067900meta shapefile). The polygonal footprint of each part used from a source dataset is retained during NED assembly to provide the spatial context. The attributes of each source dataset, such as original resolution, production method, and date entered into NED, are linked to this polygonal footprint. All these source polygons together form a seamless National coverage. Through this spatially-referenced metadata, the information is made available to the user regarding the source data used for any area of NED.

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: -97.857194

East_Bounding_Coordinate: -96.321854

North_Bounding_Coordinate: 36.397667

South_Bounding_Coordinate: 35.554333

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.

Data_Quality_Information:

Lineage:

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: South Dakota

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

City: Sioux Falls

State_or_Province: South Dakota

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_Standard_Version: FGDC-STD-001-1998