Metadata: Identification_Information: Citation: Citation_Information: Originator: Roger Tankersley, Jr. Publication_Date: 1998 Title: dem_3s Edition: 1 Geospatial_Data_Presentation_Form: Map Publication_Information: Publication_Place: Norris TN Publisher: Tennessee Valley Authority Description: Abstract: This map is an ARC/INFO Grid representing the 3 arc second digital elevation model for the entire region. Elevation is in meters. Purpose: These data were created as part of a regional assessment of landscape conditions in the mid-Atlantic region (SFR 3) (Jones et al., 1997). Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: Ending_Date: Currentness_Reference: Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -84 degrees West East_Bounding_Coordinate: -74 degrees West North_Bounding_Coordinate: 43 degrees North South_Bounding_Coordinate: 36 degrees North Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Elevation Theme_Keyword: Slope Theme_Keyword: Theme_Keyword: Theme_Keyword: Theme_Keyword: Place: Place_Keyword_Thesaurus: None Place_Keyword: United States Place_Keyword: Standard Federal Region III Access_Constraints: None Use_Constraints:None Point_of_Contact: Contact_Information: Contact_Person_Primary: Bruce Jones Contact_Person: Contact_Organization: EPA Landscape Ecology Division Contact_Address: Address_Type: mailing and physical address Address: U.S. Environmental Protection Agency, Box 93478 City: Las Vegas State_or_Province: Nevada Postal_Code: 89193-3478 Contact_Electronic_Mail_Address: jones.bruce@epamail.epa.gov Data_Set_Credit: USGS EROS data center, 3 Arc Second DEM. Native_Data_Set_Environment: These data are presently stored in ARC/INFO format. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: none Logical_Consistency_Report: none Completeness_Report: Complete Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: None Source_Information: Source_Citation: USGS 3 arc second dem. Citation_Information: Other_Citation_Details: Jones, K.B., Riitters, K.H., Wickham, J.D., Tankersley, R.D., O'Neill, R.V., Chaloud, D.J., Smith, E.R., and Neale, A.C. 1997. An Ecological Assessment of the United States Mid-Atlantic Region: A Landscape Atlas. EPA/600/R97/130, U.S. Environmental Protection Agency, Office of Research and Development, Washington, DC. Source_Information: Source_Citation: Citation_Information: Other_Citation_Details: Process_Step: Process_Description: The history of the DEM processing follows: 1. The data set distributed by USGS is described in this section. The 3-second point topography data set was developed through a series of processing procedures conducted by the Defense Mapping Agency, Topographic Center (DMATC) and the National Telecommunications and Information Administration (NTIA). These procedures are briefly outlined in the following paragraphs. The 3-second digital topographic database is called Digital Terrain Data. DMATC developed this 3-second file by digitizing topographic contour lines and geographic features from printing plates that were used to produce the 1:250,000 scale U.S. Geological Survey Topographic maps. The digitized elevation contours were then converted into grids of interpolated elevations, with a single value given for every 3" x 3" coordinate cell. These values corresponded to the elevation given for a point situated in the center of each cell. Elevation data were rounded to the nearest 20 foot interval. 2. According to the USGS Data Users Guide 5 the 1-degree elevation models from which this data set originated the array of elevations is referenced horizontally on the geographic (latitude/longitude) coordinate system of the World Geodetic System 1972 Datum (WGS 72) or the World Geodetic System of 1984 (WGS 84). Appendix H of the same guide states "All DMA DEM's and DTED's lacking datum descriptors are WGS 72." There being no datum descriptor included in this data set it is assumed the datum is WGS 72. 3. The 1 degree by 1 degree DMA 3 arc second DEMs were ftp'ed from the USGS EROS Data Center, reformatted for use on a SUN workstation, and converted to ARC/INFO GRIDs with the DEMLATTICE program. The GRIDs were then merged together with the ARC/INFO LATTICEMERGE program. Source_Used_Citation_Abbreviation: Source_Produced_Citation_Abbreviation: Process_Date: Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: raster Raster_Object_Information: Raster_Object_Type: Row_Count: Column_Count: Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Lambert_Azimuthal Lambert_Azimuthal: Radius of Sphere of Reference: 6370997 Longitude_of_Central_Meridian: -100 0 0 Latitude_of_Projection_Origin: 45 0 0 False_Easting: 0.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: Row and column Coordinate_Representation: Abscissa_Resolution: Ordinate_Resolution: Planar_Distance_Units: meters Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: VALUE Entity_Type_Definition: Elevation in meters Entity_Type_Definition_Source: ARC/INFO Attribute: Attribute_Label: COUNT Attribute_Definition: Number of cells where in each elevation class. Attribute_Definition_Source: ARC/INFO Attribute_Domain_Values: Range_Domain: Range_Domain_Maximum: Range_Domain_Minimum: Attribute_Measurement_Frequency: None planned Attribute: Attribute_Label: Attribute_Definition: Attribute_Definition_Source: ARC/INFO Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: Range_Domain_Maximum: Attribute_Measurement_Frequency: None planned Overview_Description: Entity_and_Attribute_Overview: Entity_and_Attribute_Detail_Citation: Not available Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Bruce Jones Contact_Organization: EPA Landscape Ecology Division Contact_Address: Address_Type: Address: U.S. Environmental Protection Agency, Box 93478 City: Las Vegas State_or_Province: Nevada Postal_Code: 89193-3478 Contact_Electronic_Mail_Address: jones.bruce@epamail.epa.gov Metadata_Reference_Information: Metadata_Date: 19980901 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Roger Tankersley, Jr. Contact_Organization: University of Tennessee, Department of Geography Contact_Address: Address_Type: Address: 428 G&G Building Address: City: Knoxville State_or_Province: TN Postal_Code: 37996 Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: 19940608 Metadata_Security_Information: Metadata_Security_Classification_System: None Metadata_Security_Classification: Unclassified Metadata_Security_Handling_Description: None