Identification_Information: Citation: Citation_Information: Originator: Steve Hanser and Matthias Leu, USGS-FRESC, Snake River Field Station Publication_Date: 2008 Title: Topographic Accessability Index Geospatial_Data_Presentation_Form: raster digital data Other_Citation_Details: Leu, M., S.E. Hanser, S.T. Knick. 2008. The human footprint in the west: a large-scale analysis of anthropogenic impacts. Ecological Applications 18(5): 1119-1139. Online_Linkage: http://sagemap.wr.usgs.gov Description: Abstract: The topographic accessibility index is a measure of elevation in relation to valley floor corrected for variation in valley floor elevation across the western United States (i.e., valley floor elevation at California's coast is much lower compared to a valley floor in Wyoming). This index was based on 90-m resolution digital elevation model grids (DEM; National Elevation Dataset, USGS EROS [Earth Resources Observation Systems]),3 and a landform model of the western United States (Manis et al. 2001), which delineates valley flats and near level plateaus or terraces (cell values, 1 or 4). We reclassified the landform model (cell value, 1) and multiplied this layer by the DEM to derive valley floor elevation. Using a moving window analysis (303 x 303 cells; 743.65 km2), we computed mean regional valley floor elevations and subtracted them from the DEM, to derive the difference between the local elevation and regional valley floor elevation. This data set was then resampled to 180 m resolution for analysis. Purpose: Base data Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 200 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -126.251168 East_Bounding_Coordinate: -99.317208 North_Bounding_Coordinate: 49.619578 South_Bounding_Coordinate: 30.506824 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Elevation Theme_Keyword: DEM Theme_Keyword: mean elevation Theme_Keyword: regional elevation Theme_Keyword: local elevation Theme_Keyword: topographic accessability index Theme_Keyword: valley floor Place: Place_Keyword_Thesaurus: None Place_Keyword: Washington Place_Keyword: Oregon Place_Keyword: California Place_Keyword: Idaho Place_Keyword: Nevada Place_Keyword: Utah Place_Keyword: Arizona Place_Keyword: Montana Place_Keyword: Wyoming Place_Keyword: Colorado Place_Keyword: New Mexico Place_Keyword: Western US Access_Constraints: None Use_Constraints: None. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Steven Hanser Contact_Organization: USGS-FRESC, Snake River Field Station Contact_Position: Wildlife Biologist / GIS Specialist Contact_Address: Address_Type: mailing and physical address Address: 970 Lusk St City: Boise State_or_Province: ID Postal_Code: 83706 Contact_Voice_Telephone: 208-426-2892 Contact_Facsimile_Telephone: 208-426-5210 Contact_Electronic_Mail_Address: shanser@usgs.gov Hours_of_Service: 8:00am-5:00pm MST Data_Set_Credit: Steven Hanser and Matthias Leu, USGS-FRESC, Snake River Field Station, Boise, ID Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.4.1420 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Dependent on the accuracy of the data from which this coverage was created. No additional checks for accuracy were completed on this final product. Logical_Consistency_Report: Dependent on the logical consistency of the data from which this coverage was created. No additional checks for consistency or accuracy were completed on this final product. Completeness_Report: Based on the completeness of the data from which this coverage was created. Review metadata for individual source coverages to assess completeness of each. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Steve Hanser, USGS-FRESC, Snake River Field Station Publication_Date: 1999 Title: Elevation in the Western United States (90 meter DEM) Edition: 1 Geospatial_Data_Presentation_Form: raster digital data Publication_Information: Other_Citation_Details: Leu, M., S.E. Hanser, S.T. Knick. 2008. The human footprint in the west: a large-scale analysis of anthropogenic impacts. Ecological Applications 18(5): 1119-1139. Online_Linkage: http://sagemap.wr.usgs.gov Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: dem90_hf Source_Contribution: 90m Digital Elevation Model Process_Step: Process_Description: Ran landform.aml (Manis et al 2001) to create landform classification Source_Used_Citation_Abbreviation: dem90_hf Process_Date: 4/03/2003 Source_Produced_Citation_Abbreviation: landform Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Steven Hanser Contact_Organization: USGS-FRESC, Snake River Field Station Contact_Position: Wildlife Biologist / GIS Specialist Contact_Address: Address_Type: mailing and physical address Address: 970 Lusk St City: Boise State_or_Province: ID Postal_Code: 83706 Contact_Voice_Telephone: 208-426-2892 Contact_Facsimile_Telephone: 208-426-5210 Contact_Electronic_Mail_Address: shanser@usgs.gov Hours_of_Service: 8:00am-5:00pm MST Process_Step: Process_Description: Reclassified using spatial analyst to represent valley floors and plateaus (values 1 and 4) as 1 and all others as zero. Source_Used_Citation_Abbreviation: landform Process_Date: 4/03/2003 Source_Produced_Citation_Abbreviation: valleyfloors Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Steven Hanser Contact_Organization: USGS-FRESC, Snake River Field Station Contact_Position: Wildlife Biologist / GIS Specialist Contact_Address: Address_Type: mailing and physical address Address: 970 Lusk St City: Boise State_or_Province: ID Postal_Code: 83706 Contact_Voice_Telephone: 208-426-2892 Contact_Facsimile_Telephone: 208-426-5210 Contact_Electronic_Mail_Address: shanser@usgs.gov Hours_of_Service: 8:00am-5:00pm MST Process_Step: Process_Description: Multipled the valley floor classification by the 90m DEM. Source_Used_Citation_Abbreviation: vallyfloors Source_Used_Citation_Abbreviation: dem90_hf Process_Date: 4/03/2003 Source_Produced_Citation_Abbreviation: valleyfloor elevation Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Steven Hanser Contact_Organization: USGS-FRESC, Snake River Field Station Contact_Position: Wildlife Biologist / GIS Specialist Contact_Address: Address_Type: mailing and physical address Address: 970 Lusk St City: Boise State_or_Province: ID Postal_Code: 83706 Contact_Voice_Telephone: 208-426-2892 Contact_Facsimile_Telephone: 208-426-5210 Contact_Electronic_Mail_Address: shanser@usgs.gov Hours_of_Service: 8:00am-5:00pm MST Process_Step: Process_Description: Used focal mean in ARC/INFO using a moving window of 303 x 303 cells (743.65km2). Source_Used_Citation_Abbreviation: valleyfloor elevation Process_Date: 4/03/2003 Source_Produced_Citation_Abbreviation: valleyfloor mean elevation Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Steven Hanser Contact_Organization: USGS-FRESC, Snake River Field Station Contact_Position: Wildlife Biologist / GIS Specialist Contact_Address: Address_Type: mailing and physical address Address: 970 Lusk St City: Boise State_or_Province: ID Postal_Code: 83706 Contact_Voice_Telephone: 208-426-2892 Contact_Facsimile_Telephone: 208-426-5210 Contact_Electronic_Mail_Address: shanser@usgs.gov Hours_of_Service: 8:00am-5:00pm MST Process_Step: Process_Description: Subtracted the valleyfloor mean from each grid cell to obtain a residual, the difference between the local and regional elevation. Source_Used_Citation_Abbreviation: valleyfloor mean elevation Source_Used_Citation_Abbreviation: dem90_hf Process_Date: 04/03/2003 Source_Produced_Citation_Abbreviation: topoaccess_hf90 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Steven Hanser Contact_Organization: USGS-FRESC, Snake River Field Station Contact_Position: Wildlife Biologist / GIS Specialist Contact_Address: Address_Type: mailing and physical address Address: 970 Lusk St City: Boise State_or_Province: ID Postal_Code: 83706 Contact_Voice_Telephone: 208-426-2892 Contact_Facsimile_Telephone: 208-426-5210 Contact_Electronic_Mail_Address: shanser@usgs.gov Hours_of_Service: 8:00am-5:00pm MST Process_Step: Process_Description: Resampled from 90m to 180m resolution for use in analysis Source_Used_Citation_Abbreviation: topoaccess_hf90 Source_Produced_Citation_Abbreviation: topoaccess_hf Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Steven Hanser Contact_Organization: USGS-FRESC, Snake River Field Station Contact_Position: Wildlife Biologist / GIS Specialist Contact_Address: Address_Type: mailing and physical address Address: 970 Lusk St City: Boise State_or_Province: ID Postal_Code: 83706 Contact_Voice_Telephone: 208-426-2892 Contact_Facsimile_Telephone: 208-426-5210 Contact_Electronic_Mail_Address: shanser@usgs.gov Hours_of_Service: 8:00am-5:00pm MST Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 11358 Column_Count: 11094 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: 180.000000 Ordinate_Resolution: 180.000000 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: topoaccess_hf.vat Attribute: Attribute_Label: Rowid 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: Deviation from regional valley floor elevation (meters) Attribute: Attribute_Label: COUNT Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS, Snake River Field Station, GIS Laboratory Contact_Position: Geographer Contact_Address: Address_Type: mailing and physical address Address: 970 Lusk St City: Boise State_or_Province: ID Postal_Code: 83706 Country: USA Contact_Voice_Telephone: 208-426-5204 Contact_Facsimile_Telephone: 208-426-5210 Contact_Electronic_Mail_Address: tom_zarriello@usgs.gov Resource_Description: 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. 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