Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey (USGS), EROS Data Center Publication_Date: 1999 Title: National Elevation Dataset for the Western United States Edition: 1 Geospatial_Data_Presentation_Form: raster digital data Publication_Information: Publication_Place: Sioux Falls, SD Publisher: U.S. Geological Survey Online_Linkage: \\Sparrow\Sparrow_s\HABITAT_ASSESS\FINAL_LAYERS\Figure_5.4\dem_sgca Description: Abstract: Digital elevation model used for the conservation assessment of Greater Sage-grouse and sagebrush habitat conducted by the Western Association of Fish and Wildlife Agencies. Digital elevation models were downloaded from the USGS National Elevation Dataset (NED) which was developed by merging the highest-resolution, best quality elevation data available across the United States into a seamless raster format to provide 1:24,000-scale Digital Elevation Model (DEM) data for the conterminous US. Purpose: This coverage defines the range of elevation values for the area of interest in the range-wide conservation assessment of the Greater Sage-grouse and sagebrush habitats. This information permits the comparison of differences relative to abiotic characterisics within the sagebrush region and detection of potential causes of sage-grouse population changes or extirpation. Supplemental_Information: 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. 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: Single_Date/Time: Calendar_Date: 19990201 Currentness_Reference: publication date Status: Progress: In work Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -145.662370 East_Bounding_Coordinate: -80.142691 North_Bounding_Coordinate: 50.626467 South_Bounding_Coordinate: 25.767109 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 Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Cara Meinke Contact_Organization: USGS-FRESC Snake River Field Station Contact_Position: Wildlife Biologist Contact_Voice_Telephone: 208-426-2696 Contact_Facsimile_Telephone: 208-426-5210 Contact_Electronic_Mail_Address: cara_meinke@usgs.gov Native_Data_Set_Environment: Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.3.0.800 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: none Logical_Consistency_Report: none Completeness_Report: none Lineage: Source_Information: Type_of_Source_Media: DIGITAL SPATIAL DATA Source_Citation_Abbreviation: NED Source_Contribution: http://gisdata.usgs.gov/NED/ Process_Step: Process_Description: Obtained NED data for western US from http://seamless.usgs.gov. Resampled each downloaded grid from 30m to 90m resolution. Merged all grids covering the area of interest (western US) for the conservation assessment of Greater Sage-grouse and sagebrush habitat conducted by the Western Association of Fish and Wildlife Agencies. Converted from floating point to integer. Source_Used_Citation_Abbreviation: NED Process_Date: 2004 Source_Produced_Citation_Abbreviation: dem_sgca Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 26383 Column_Count: 55135 Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Albers Conical Equal Area Albers_Conical_Equal_Area: Standard_Parallel: 38.000000 Standard_Parallel: 41.000000 Longitude_of_Central_Meridian: -114.000000 Latitude_of_Projection_Origin: 34.000000 False_Easting: 0.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 90.000000 Ordinate_Resolution: 90.000000 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.400000 Denominator_of_Flattening_Ratio: 294.978698 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: dem_sgca Entity_Type_Definition: Attributes of National Elevation Dataset Entity_Type_Definition_Source: USGS and ESRI Attribute: Attribute_Label: ObjectID Attribute_Definition: Internal feature number. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: Value Attribute_Definition: elevation value in meters Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -83 Range_Domain_Maximum: 4409 Attribute: Attribute_Label: Count Attribute_Definition: the number of cells of a give value Attribute_Definition_Source: ESRI Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 16775791 Overview_Description: Entity_and_Attribute_Overview: Value field represents elevation value Entity_and_Attribute_Detail_Citation: http://gisdata.usgs.gov/NED/ 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: 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) downloadable data Distribution_Liability: We make every effort to provide and maintain accurate, complete, usable, and timely information on our web sites. However, some USGS data and information accessed through these pages may, of necessity, be preliminary in nature and presented prior to final review and approval by the Director of the USGS. These data and information are provided with the understanding that they are not guaranteed to be correct or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Transfer_Size: 639.375 Fees: none Ordering_Instructions: download from http://seamless.usgs.gov/ Metadata_Reference_Information: Metadata_Date: 20041013 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: 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 Metadata_Time_Convention: local time Metadata_Access_Constraints: none Metadata_Use_Constraints: none Metadata_Security_Information: Metadata_Security_Classification_System: none Metadata_Security_Classification: none Metadata_Security_Handling_Description: none Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile