Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey (USGS), EROS Data Center Publication_Date: 1999 Title: USGS 30 Meter Resolution, One-Sixtieth Degree National Elevation Dataset for CONUS, Alaska, Hawaii, Puerto Rico, and the U. S. Virgin Islands Edition: 1 Geospatial_Data_Presentation_Form: raster digital data Publication_Information: Publication_Place: Sioux Falls, SD Publisher: U.S. Geological Survey Online_Linkage: 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. The horizonal units (elevation) are in CENTIMETERS. The USEPA used a "clipgrid" program to clip the GRID from each 8 digit HUC code boundary with a one mile buffer for the United States and it's territories. 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. 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: -170.0000 East_Bounding_Coordinate: -65.0000 North_Bounding_Coordinate: 70.0000 South_Bounding_Coordinate: 17.0000 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 Place_Keyword: Conterminous United States of America Place_Keyword: Puerto Rico PR Place_Keyword: U.S. Virgin Islands VI Place_Keyword: Alabama AL Place_Keyword: Alaska AK Place_Keyword: Arizona AZ Place_Keyword: Arkansas AR Place_Keyword: California CA Place_Keyword: Colorado CO Place_Keyword: Connecticut CT Place_Keyword: Delaware DE Place_Keyword: District of Columbia DC Place_Keyword: Florida FL Place_Keyword: Georgia GA Place_Keyword: Hawaii HI Place_Keyword: Idaho ID Place_Keyword: Illinois IL Place_Keyword: Indiana IN Place_Keyword: Iowa IA Place_Keyword: Kansas KS Place_Keyword: Kentucky KY Place_Keyword: Louisiana LA Place_Keyword: Maine ME Place_Keyword: Maryland MD Place_Keyword: Massachusetts MA Place_Keyword: Michigan MI Place_Keyword: Minnesota MN Place_Keyword: Mississippi MS Place_Keyword: Missouri MO Place_Keyword: Montana MT Place_Keyword: Nebraska NE Place_Keyword: Nevada NV Place_Keyword: New Hampshire NH Place_Keyword: New Jersey NJ Place_Keyword: New Mexico NM Place_Keyword: New York NY Place_Keyword: North Carolina NC Place_Keyword: North Dakota ND Place_Keyword: Ohio OH Place_Keyword: Oklahoma OK Place_Keyword: Oregon OR Place_Keyword: Pennsylvania PA Place_Keyword: Rhode Island RI Place_Keyword: South Carolina SC Place_Keyword: South Dakota SD Place_Keyword: Tennessee TN Place_Keyword: Texas TX Place_Keyword: Utah UT Place_Keyword: Vermont VT Place_Keyword: Virginia VA Place_Keyword: Washington WA Place_Keyword: West Virginia WV Place_Keyword: Wisconsin WI Place_Keyword: Wyoming WY 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 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.0001 Longitude_Resolution: 0.0001 Geographic_Coordinate_Units: Decimal Degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6,378,137 Denominator_of_Flattening_Ratio: 298.257 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: National Geodetic Vertical Datum of 1988 except for Alaska National Geodetic Vertical Datum of 1929 Altitude_Resolution: 1 Altitude_Distance_Units: CENTIMETERS Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: USEPA Office of Water/OST Basins Contact_Address: Address_Type: mailing address Address: 1200 Penn. Ave., NW Mail Stop 4305T City: Washington State_or_Province: District of Columbia Postal_Code: 20460 Contact_Voice_Telephone: 202-566-0400 Contact_Facsimile_Telephone: 202-566-0409 Contact_Electronic_Mail_Address: basins@epa.gov Hours_of_Service: 9-3 EST Distribution_Liability: Although these data have been processed successfully on a computer system under contract to the U.S. Environmental Protection Agency (USEPA), no warranty expressed or implied is made by the USEPA regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. The USEPA will warrant the delivery of this product in computer-readable format. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: Environmental Systems Research Institute (ESRI) ArcView GRID Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://www.epa.gov/waterscience/BASINS Offline_Option: Offline_Media: CD-ROM Recording_Format: ISO 9660 Fees: None Ordering_Instructions: When requesting data by phone or mail, please inquire about spatial data sets that work with Better Assessment Science Integrating Point and Nonpoint Sources (BASINS). The BASINS web page has instructions for downloading datasets. Metadata_Reference_Information: Metadata_Date: 20070611 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