Identification_Information: Citation: Citation_Information: Originator: Computer Terrain Mapping, Inc. Publication_Date: 2005 Title: Alpine Loop Visual Resources Geospatial_Data_Presentation_Form: map Description: Abstract: The Alpine Loop Visual Resources data set shows the distribution of important viewsheds and visually significant skyline regions from a number of roadways in the study area. This data set is used to determine the Conservation Resource Value. The visual resource mapping combined two separate analyses: important viewsheds and visually significant skyline regions. This data set shows the combined visual resource map. The viewshed algorithm assesses the visibility of a structure on the landscape disregarding trees, intervening buildings and other non-topographic obstructions. The skyline utility checks for visibility of a structure above the physical skyline. Purpose: The Alpine Loop Spatial Analysis and Mapping Project inventoried natural and cultural resources and identified important areas where overlapping resources occur. The results from this project will provide an opportunity for area stakeholders - landowners, outdoor enthusiasts, surrounding communities, federal government agencies and local and national preservation groups - to come together to find solutions that maintain the Alpine Loop experience for future visitors and residents, while working within the framework of landowner objectives as well as local and federal government goals. The Alpine Loop Spatial Analysis and Mapping Project analyzed the Alpine Loop landscape, considering important natural and cultural resources along with the likelihood of development based upon building constraints. The Project aims to provide a planning tool for area stakeholders as they consider the variety of land management options and the future of this magnificent region. The next logical step will be to craft solutions that work within the framework of landowner desires, local and federal government land management goals, and available financial and technical resources to manage the area in a way that preserves the Alpine Loop experience for future generations. While the Alpine Loop lies within three counties - San Juan, Hinsdale and Ouray - the analytical work extended into a portion of San Miguel County. The resulting mapping and analyses will: 1. Create a spatial foundation to aid future projects in the Alpine Loop corridor; 2. Serve as a prioritization tool for evaluating the conservation potential of individual private parcels; 3. Provide the necessary framework for pursuing future funding opportunities. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2003 Ending_Date: 2005 Currentness_Reference: Data were retrieved from various sources and analyzed between 2003 and 2005. See Data Quality Information for time information for source data. Status: Progress: Complete Maintenance_and_Update_Frequency: None Planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -107.8725478 East_Bounding_Coordinate: -107.2256611 North_Bounding_Coordinate: 38.08819806 South_Bounding_Coordinate: 37.73515861 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Conservation Theme_Keyword: Resources Theme_Keyword: Visual Place: Place_Keyword_Thesaurus: None Place_Keyword: United States Place_Keyword: North America Place_Keyword: Colorado Place_Keyword: San Juan Mountains Place_Keyword: Ouray County Place_Keyword: San Juan County Place_Keyword: Hinsdale County Place_Keyword: San Miguel County Place_Keyword: Ouray Place_Keyword: Silverton Place_Keyword: Lake City Access_Constraints: None Use_Constraints: None. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Computer Terrain Mapping, Inc. Contact_Person: Ed Russell Contact_Position: President Contact_Address: Address_Type: mailing Address: PO Box 4982 City: Boulder State_or_Province: CO Postal_Code: 80306 Country: USA Contact_Voice_Telephone: 303.444.1670 Contact_Facsimile_Telephone: 303.443.4856 Contact_Electronic_Mail_Address: ctm@ctmap.com Hours_of_Service: 8:00-5:00 MT Data_Set_Credit: This data set is the product of a collaborative process between numerous agencies, organizations and interested individuals from the beautiful Alpine Loop region. Native_Data_Set_Environment: GRASS version 5 on Red-Hat Linux version 8.0 exported to an ASCII Grid Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Visual resources were calculated directly from NED. See http://gisdata.usgs.net/NED/default.asp for accuracy information for NED. Viewshed and skyline analyses were based on topographic features only. Obstruction from vegetation (trees), buildings, etc. was not taken into account. Logical_Consistency_Report: Data are calculated from a single reliable source. Only basic spot checking based on knowledge of terrain was performed. Completeness_Report: Visual resources were calculated for the entire study area. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey (USGS), EROS Data Center Publication_Date: 1999 Title: National Elevation Dataset Publication_Information: Publication_Place: Sioux Falls, SD Publisher: USGS Online_Linkage: Type_of_Source_Media: digital Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1999 Ending_Date: Unknown Source_Currentness_Reference: Publication date Source_Citation_Abbreviation: NED Source_Contribution: Elevation data. Process_Step: Process_Description: Computed viewshed, i.e., land area visible, from points sampled at 100m spacing along a number of roads and trails in the area, including the Alpine Loop; San Juan Skyway between Alpine Loop intersections (Uncompahgre River to Silverton); Silverton to Gladstone (Cement Creek); Corkscrew; Hurricane; California; Treasure Mountain (Placer and Picayune); Stoney Pass; Cottonwood Creek Road; North Henson Creek Road; Nellie Creek Road; Silver Creek Trail; Grizzly Gulch Trail; American Basin Trail. BLM American Basin ACEC was also included. Source_Used_Citation_Abbreviation: NED Source_Used_Citation_Abbreviation: viewshed model Process_Date: 2005 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 1256 Column_Count: 1863 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 13 Transverse_Mercator: Scale_Factor_at_Central_Meridian: .9996 Longitude_of_Central_Meridian: -105 00 00 Latitude_of_Projection_Origin: 00 00 00 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 30.0 Ordinate_Resolution: 30.0 Planar_Distance_Units: METERS Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 (NAD83) Ellipsoid_Name: GRS 1980 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257222101 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Visual resource grid cell Entity_Type_Definition: Any of the data elements in the visual resource map Entity_Type_Definition_Source: author Attribute: Attribute_Label: Visual grid cell value Attribute_Definition: The value represents the visibility of a structure combined with the potential visibility of a structure above the skyline. The viewshed and skyline results were added and categorized as low, medium or high based on 33-percentiles. The lowest third of the visual resource spectrum was assigned a 1; the middle third a 2 and the highest third a 3. The BLM American Basin ACEC was also assigned a 3 value for its high visual quality. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 3 Attribute_Definition_Source: author Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Computer Terrain Mapping, Inc. Contact_Person: Ed Russell Contact_Position: President Contact_Address: Address_Type: mailing Address: PO Box 4982 City: Boulder State_or_Province: CO Postal_Code: 80306 Country: USA Contact_Voice_Telephone: 303.444.1670 Contact_Facsimile_Telephone: 303.443.4856 Contact_Electronic_Mail_Address: ctm@ctmap.com Resource_Description: Alpine Loop Spatial Analysis and Mapping Project Distribution_Liability: Computer Terrain Mapping, Inc. (CTM) provides this data set as is. CTM makes no guarantee or warranty concerning the accuracy of information contained in the data. CTM further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although this data has been processed successfully on computers at CTM, no warranty, expressed or implied, is made by the CTM regarding the use of this data on any other system, nor does the fact of distribution constitute or imply any such warranty. Custom_Order_Process: Contact distributor to receive additional copies. Metadata_Reference_Information: Metadata_Date: 200504 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Computer Terrain Mapping, Inc. Contact_Person: Ed Russell Contact_Position: President Contact_Address: Address_Type: mailing Address: PO Box 4982 City: Boulder State_or_Province: CO Postal_Code: 80306 Country: USA Contact_Voice_Telephone: 303.444.1670 Contact_Facsimile_Telephone: 303.443.4856 Contact_Electronic_Mail_Address: ctm@ctmap.com Hours_of_Service: 8:00-5:00 MT Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998