Identification_Information: Citation: Citation_Information: Originator: Jonathan Godt Originator: Jeffrey Coe Publication_Date: 2003 Title: fr-ip Edition: 1.0 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 03-050 Publication_Information: Publication_Place: Denver, Colorado Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/2003/ofr-03-050/ Larger_Work_Citation: Citation_Information: Originator: Jonathan W. Godt Originator: Jeffrey A. Coe Publication_Date: 2003 Title: Map showing alpine debris flows triggered by a July 28, 1999 thunderstorm in the central Front Range of Colorado Edition: 1.0 Geospatial_Data_Presentation_Form: map Online_Linkage: http://pubs.usgs.gov/of/2003/ofr-03-050/ Description: Abstract: On July 28, 1999, about 480 debris flows were triggered by an afternoon thunderstorm along the Continental Divide in Clear Creek and Summit counties in the central Front Range of Colorado. This cover shows the initiation locations of the debris flows. Jonathan Godt and Jeffrey Coe mapped the debris flows from 1:12,000 scale color aerial photography using a Kern PG-2 photogrammetric plotter. The photographs were scaled and oriented to the topographic base map using prominent topographic landmarks and plotted on a transparent polyester overlay registered to the topographic base maps at 1:12,000 scale. The mapped landslides were digitized manually in ArcInfo. The final scale of the data are 1:24,000. For soil slips, the initiation point was easily identified as the center of the headscarp of the landslide failure. However, for the non-soil slip category, the initiation locations in the database may represent multiple small rills. The initiation locations of the fire-hose flows are the highest point in the bedrock channel that appeared freshly scoured in the aerial photographs. See Open-File Report 03-050 for description of debris-flow initiation processes. Purpose: The purpose of these data is provide an inventory the debris flows that were triggered over a 2-square kilometer area in the central Front Range of Colorado by a July 28, 1999 thunderstorm. These data do not consitute a debris-flow hazard map of the area. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 9/11/2000 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -105.890558 East_Bounding_Coordinate: -105.761486 North_Bounding_Coordinate: 39.765877 South_Bounding_Coordinate: 39.591239 Keywords: Theme: Theme_Keyword_Thesaurus: http://edcnts11.cr.usgs.gov/theo/ Theme_Keyword: debris flow Theme_Keyword: alpine Access_Constraints: none Use_Constraints: This map is an inventory map, not hazard map, and should not be enlarged to a scale larger than 1:24,000. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jonathan Godt Contact_Organization: U.S. Geological Survey Contact_Position: Physical Scientist Contact_Address: Address_Type: mailing address Address: Box 25046, MS 966 City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303-273-8626 Contact_Facsimile_Telephone: 303-273-8600 Contact_Electronic_Mail_Address: jgodt@usgs.gov Hours_of_Service: 8am - 4pm MST Contact_Instructions: e-mail preferred contact Security_Information: Security_Classification: Unclassified Native_Data_Set_Environment: Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 2; ESRI ArcCatalog 8.2.0.700 Data_Quality_Information: Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The scale of the aerial photography allowed us to accurately identify debris-flow features as small as about 0.5 m. At 1:24,000 scale, debris-flow features less than about 5 m wide (~ 0.2 mm at 1:24,000) are not visible. Lineage: Process_Step: Process_Description: The debris-flow source areas, travel paths, and deposits were mapped using 1:12,000-scale color aerial photographs and a Kern PG-2 photogrammetric plotter. The photographs were scaled and oriented to the topographic base map using prominent topographic landmarks and plotted on a transparent polyester overlay registered to the topographic base maps at a scale of 1:12,000. The mapped debris flows were digitized manually in ArcInfo. Debris-flow initiation locations were defined as the points farthest upslope for each mapped debris-flow. In many cases, single mapped debris flows have multiple initiation locations, some of which are not visible at 1:24,000 scale. For soil slips, the initiation point was easily identified as the center of the headscarp of the landslide failure. However, for the non-soil slip category, the initiation locations in the database may represent multiple small rills. The initiation locations of the fire-hose flows are the highest point in the bedrock channel that appeared freshly scoured in the aerial photographs. See Open-File Report 03-050 for description of debris-flow initiation processes. Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point Point_and_Vector_Object_Count: 481 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 546 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: 0.999600 Longitude_of_Central_Meridian: -105.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000032 Ordinate_Resolution: 0.000032 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: fr-ip.pat Attribute: Attribute_Label: FID 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: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Coordinates defining the features. Attribute: Attribute_Label: AREA Attribute_Definition: Area of feature in internal units squared. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Area is always zero for point coverages. Values are automatically generated. Attribute: Attribute_Label: PERIMETER Attribute_Definition: Perimeter of feature in internal units. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Perimeter is always zero for point coverages. Values are automatically generated. Attribute: Attribute_Label: FR-IP# 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: FR-IP-ID Attribute_Definition: User-defined feature number. Attribute_Definition_Source: ESRI Attribute: Attribute_Label: STYLE Attribute_Definition: debris-flow initiation style Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: ss Enumerated_Domain_Value_Definition: soil slip Enumerated_Domain: Enumerated_Domain_Value: non-ss Enumerated_Domain_Value_Definition: not soil slip Distribution_Information: Resource_Description: Downloadable Data Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Transfer_Size: 0.080 Metadata_Reference_Information: Metadata_Date: 20030314 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jonathan Godt Contact_Organization: U.S. Geological Survey Contact_Position: Physical Scientist Contact_Address: Address_Type: mailing address Address: Box 25046 City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303-273-8626 Contact_Facsimile_Telephone: 303-273-8600 Contact_Electronic_Mail_Address: jgodt@usgs.gov Hours_of_Service: 8am - 4pm MST Contact_Instructions: e-mail contact preferred 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: Unclassified Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile