Identification_Information: Citation: Citation_Information: Originator: S.P. Schilling Originator: S. Doelger Originator: W.E. Scott Originator: T.C. Pierson Originator: J.E. Costa Originator: C.A. Gardner Originator: J.W. Vallance Originator: J.J. Major Publication_Date: 2008 Title: Digital Data for Volcano Hazards in the Mount Hood Region, Oregon Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: U.S. Geological Survey Open-File Report Publication_Information: Publication_Place: Vancouver, WA Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/2007/1222/ Description: Abstract: Mt Hood is a potentially active volcano that lies close to growing communities and recreation areas. The greatest hazard from a future eruption would be for lahars (fast moving mudflows) to sweep down river channels surrounding the mountain, causing property damage or destruction. Scientists at the USGS Cascade Volcano Observatory created the GIS data layer mthhaz to delineate proximal and distal hazard zones that could be affected by lahars in the event of an eruption. This data set was generated with a combination of computer modeling and geologic evidence of past events at Mt. Hood as recorded in deposits. An additional data layer, mtharr, shows points along the riverbeds that give the estimated time travel for potential lahars. Purpose: These volcanic hazard zones are intended for use by public and private agencies to view, overlay with other Geographic Information System (GIS) data sets, and make maps of volcanic hazards from potential future eruptions of Mount Hood, Oregon. It is critical to understand the nature of the boundaries of the volcanic hazard zones. Although arcs serve as boundaries of hazard zones, the degree of hazard does not change abruptly at these boundaries. Rather, a volcanic hazard decreases gradually with increased distance from the volcano and above the valley floor. These volcanic hazards also span a range of size and recurrence. The hazard zones delineated in this data set portray volcanic events believed most likely from future activity at Mount Hood, Oregon. Areas outside the hazard zones, especially those having low relief, should not be regarded as hazard-free. Too many uncertainties exist in source, size, and mobility of future events to locate boundaries of zero-hazard zones with confidence. Other_References_Cited: Costa, John E., 1997, Hydraulic modeling for lahar hazards at Cascade volcanoes: Environmental & Engineering Geoscience, V. 3, No. 1, pp. 21-30. Schilling, Steve P. and Iverson, Richard M., 1997, Automated, reproducible delineation of zones at risk from inundation by large volcanic debris flows: in Chen, C. (editor), Hazards mitigation: mechanics, prediction, and assessment, Proceedings of first international conference, American Society of Civil Engineers, pp 176-186. Scott, W.E., Pierson, T.C., Schilling, S.P., Costa, J.E., Gardner, C.A., Vallance, J.W., and Major, J.J., 1997, Volcano hazards in the Mount Hood Region, Oregon: U.S. Geological Survey, Open-file Report 97-89, 14 p. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1997 Currentness_Reference: Coverage was used to create hazard assessment map for Mount Hood (Scott and others, 1997). Status: Progress: Complete Maintenance_and_Update_Frequency: as needed. Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -122.503659 East_Bounding_Coordinate: -120.814807 North_Bounding_Coordinate: 45.757948 South_Bounding_Coordinate: 45.126630 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: hazard Theme_Keyword: volcanic hazard Theme_Keyword: pyroclastic flow Theme_Keyword: surge Theme_Keyword: lava dome Theme_Keyword: debris avalanche Theme_Keyword: debris flow Theme_Keyword: lahar Theme_Keyword: mudflow Theme_Keyword: proximal hazard Theme_Keyword: distal hazard Theme_Keyword: travel time Theme_Keyword: recurrence Theme_Keyword: size Theme_Keyword: laharz Theme_Keyword: GIS data Place_Keyword: computer modeling Theme_Keyword: lava flow Theme_Keyword: ballistic Theme_Keyword: flood modeling Theme_Keyword: DAMBRK Place: Place_Keyword_Thesaurus: None Place_Keyword: Mt. Hood Place_Keyword: Mount Hood Place_Keyword: Cascade Range Place_Keyword: Oregon Place_Keyword: USA Place_Keyword: Pacific Northwest Place_Keyword: Crater Rock Place_Keyword: Sandy River Place_Keyword: white River Place_Keyword: Hood River Place_Keyword: Columbia River Place_Keyword: Troutdale Place_Keyword: White Salmon Access_Constraints: none Use_Constraints: Although digital data is easy to view at nearly any scale or projection, each vector data set has a compilation scale that determines the accuracy and reliable use of the data set. The vectors in this data set were compiled and checked for accuracy at a scale of 1:100,000 and thereby should only be used at 1:100,000 or smaller scales. The data set is inappropriate for use at scales larger than 1:100,000. Doing so will produce inaccurate and unreliable results. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Steve Schilling Contact_Address: Address_Type: mailing and physical address Address: Cascades Volcano Observatory 1300 SE Cardinal Ct. Suite 100 City: Vancouver State_or_Province: WA Postal_Code: 98683 Country: USA Contact_Voice_Telephone: (360) 993-8900 Contact_Facsimile_Telephone: (360) 993-8980 Contact_Electronic_Mail_Address: sschilli@usgs.gov Data_Set_Credit: S.P. Schilling, W.E. Scott, T.C. Pierson, J.E. Costa, C.A. Gardner, and J.J. Major (all from the U.S. Geological Survey, Cascades Volcano Observatory, Vancouver, WA 98661) and J.W. Vallance (from McGill University, Department of Civil Engineering and Applied Mechanics, 817 Sherbrooke St. West, Montreal, QC, H3A 2K6, Canada) contributed scientific knowledge and interpretation of volcanic processes to create this data set. Security_Information: Security_Classification_System: None Security_Classification: Unclassified Security_Handling_Description: None Native_Data_Set_Environment: Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 8.3.0.800 Cross_Reference: Citation_Information: Originator: Scott, W. E. Originator: Pierson, T. C. Originator: Schilling, S. P. Originator: Costa, J. E. Originator: Gardner, C. A. Originator: Vallance, J. W. Originator: Major, J. J. Publication_Date: 1997 Title: Volcano hazards in the Mount Hood region, Oregon Series_Information: Series_Name: U.S. Geological Survey Open-file Report Issue_Identification: 97-89 Publication_Information: Publication_Place: Vancouver, WA Publisher: U.S. Geological Survey Online_Linkage: Cross_Reference: Citation_Information: Originator: Costa, John E. Publication_Date: 1997 Title: Hydraulic Modeling for Lahar Hazards at Cascades Volcanoes Series_Information: Series_Name: Environmental & Engineering Geoscience Issue_Identification: Vol. III, No. 1 Publication_Information: Publication_Place: Boulder, CO Publisher: Geological Society of America and Association of Engineering Geologists Cross_Reference: Citation_Information: Originator: Schilling, Steve P. Originator: Iverson, Richard M. Publication_Date: 1997 Title: Automated, Reproducible Delineation of Zones at risk from inundation by Large Volcanic debris flows Series_Information: Series_Name: Debris-flow Hazards Mitigation: Mechanics, Prediction, and Assessment Issue_Identification: 1 Publication_Information: Publication_Place: New York, NY Publisher: American Society of Civil Engineers Other_Citation_Details: (Editor) Chen, Cheng-lung Proceeding of First International Conference Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: See Entity_Attribute_Information Quantitative_Attribute_Accuracy_Assessment: Attribute_Accuracy_Value: See Explanation Attribute_Accuracy_Explanation: The attribute accuracy is described, where present, with each attribute defined in the Entity and Attribute Section. Logical_Consistency_Report: Polygon and chain-node topology present. Hazard zone polygons are logically consistent throughout coverage. Completeness_Report: This data set includes hazard zones in the Mount Hood area that may be affected by volcanic processes during a future eruption of Mount Hood. This data set does not include zones of hazard that may be affected by future eruptions of numerous other volcanic vents in the Mount Hood region. This data set also includes travel time marker locations along drainages in the Mount Hood area that may be impacted by volcanic processes during a future eruption of Mount Hood. This data set does not include travel times that may be affected by future eruption of numerous other volcanic vents in the Mount Hood region. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Original linework was compiled on Mylar greenlines of U.S. Geological Survey topographic quadrangles created according to National Map Accuracy Standards. Digitized linework were plotted, registered to original linework, and inspected visually for discrepancy of greater than a linewidth (approximately 0.007 inches). For computer modelling, Digital Elevation Models having cell sizes of about 62 ground meters or about 2 millimeters on the map at 1:100,000 scale were derived from Digital Line Graph contour layers that were created according to National Map Accuracy Standards. All linework was plotted with DLG contour layers to check for positional accuracy as are reasonable according to geologic and hydrologic principles. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: 1:100,000 scale Digital Line Graph (DLG) contours have contour intervals of either 50 or 40 meters as well as Digital Elevation Models have vertical accuracies according to the National Map Accuracy Standards. All linework was plotted with DLG contour layers to check for positional accuracy as are reasonable according to geologic and hydrologic principles. Lineage: Process_Step: Process_Description: Linework was captured by hand digitizing and computer modeling, and copyied from Digital Line Graph hydrology coverages. Digitizing procedures: Arcs were digitized in tablet inches from lines inked on 1:24,000 or 1:100,000 scale topographic Mylar greenlines. Each quadrangle was registered to the digitizer and re-registered to ensure that tics could be relocated with an RMS equal to or less than 0.004. Lines were digitized using a NODESNAP CLOSEST .05 and a weed tolerance of 0. A second coverage was CREATEd from the first. In INFO, the tics were changed from inch coordinates to decimal degree coordinates and saved. The decimal degree coordinate coverage was converted to a UTM projection using: INPUT PROJECTION GEOGRAPHIC UNITS DD PARAMETERS OUTPUT PROJECTION UTM UNITS METERS ZONE 10 PARAMETERS END Each coverage in inches was TRANSFORMed to the empty UTM coverage ensuring the transformation RMS was equal or less than 0.004 inches. The individual coverages were edgematched and merged into a single coverage. Coverages were checked for digitizing accuracy both before and after merging by plotting linework at 1:24,000 or 1:100,000 scale as appropriate and overlain on original linework. Process_Date: Unknown Process_Step: Process_Description: Procedures for computer modeling: Major drainages west or north of Mount Hood were modeled for inundation by debris avalanche and lahar of about 500 million cubic meters by a preliminary version of LAHARZ software (Schilling and Iverson, 1997). This method creates inundation zones from cross-sections calculated a Digital Elevation Model in the ArcINFO Grid program. The resulting grid having a cell size of about 2 millimeters or about 62 meters on the ground, was converted to a polygon coverage. In ARCEdit, the polygon coverage and 1:100,000 scale contours were drawn as background coverages. Polygons were drawn (using geologic and hydrologic principles where needed) on-screen in the foreground that enclosed the area defined by the grid. The resulting coverage was plotted with 1:100,000 scale Digital Line Graph contours for review by scientists. Process_Step: Process_Description: Clipping DLG hydrology coverage: Arcs were clipped from 1:100,000 Digital Line Graph hydrology and added to the hazard coverage to close polygons along the Columbia River. Polygons were tagged with a PCODE value and arcs were tagged with an LCODE and SOURCE value. All arcs were inspected by authors from check plots and reviewers studied final plots at 1:100,000 scale Spatial_Data_Organization_Information: Indirect_Spatial_Reference: Mount Hood Volcano and vicinity, Oregon Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Complete chain Point_and_Vector_Object_Count: 196 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Label point Point_and_Vector_Object_Count: 84 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Point_and_Vector_Object_Count: 83 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 16 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 10 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -123.000000 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: 0.000256 Ordinate_Resolution: 0.000256 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: mthhaz.aat Entity_Type_Definition: Arc attribute table for MTHHAZ Entity_Type_Definition_Source: Field mapping, computer modelling, experience, and interpretation 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: Enumerated_Domain: Unrepresentable_Domain: Coordinates that are automatically generated. Attribute: Attribute_Label: FNODE# Attribute_Definition: Internal node number for the beginning of an arc (from-node). Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Whole numbers that are automatically generated. Attribute: Attribute_Label: TNODE# Attribute_Definition: Internal node number for the end of an arc (to-node). Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Whole numbers that are automatically generated. Attribute: Attribute_Label: LPOLY# Attribute_Definition: Internal node number for the left polygon. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Whole numbers that are automatically generated. Attribute: Attribute_Label: RPOLY# Attribute_Definition: Internal node number for the right polygon. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Whole numbers that are automatically generated. Attribute: Attribute_Label: LENGTH Attribute_Definition: Length of arc in meters. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Attribute: Attribute_Label: MTHHAZ# 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: MTHHAZ-ID Attribute_Definition: Internal feature number. Attribute_Definition_Source: ESRI Attribute: Attribute_Label: LCODE Attribute_Definition: Line code for drawing arcs Attribute_Definition_Source: Field mapping, computer modelling, experience, and interpretation Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 1 Enumerated_Domain_Value_Definition: Arc code used for displaying arcs Enumerated_Domain_Value_Definition_Source: Author Enumerated_Domain: Enumerated_Domain_Value: 99 Enumerated_Domain_Value_Definition: Arc code used for displaying arcs Enumerated_Domain_Value_Definition_Source: Author Attribute: Attribute_Label: SOURCE Attribute_Definition: Sources used to create arcs Attribute_Definition_Source: Field mapping, computer modelling, experience, and interpretation Enumerated_Domain: Enumerated_Domain_Value: 1 Enumerated_Domain_Value_Definition: Arcs were digitized from stable Mylar bases containing hazard zone boundaries. Enumerated_Domain_Value_Definition_Source: Author Enumerated_Domain: Enumerated_Domain_Value: 2 Enumerated_Domain_Value_Definition: Arcs were digitized from stable mylar bases containing hazard zonation boundaries guided by output from flood routing computer model (DAMBRK). Enumerated_Domain_Value_Definition_Source: Author Enumerated_Domain: Enumerated_Domain_Value: 3 Enumerated_Domain_Value_Definition: Arcs were derived from lahar inundation computer model (LAHARZ) using GIS software and Digital Elevation Model. Enumerated_Domain_Value_Definition_Source: Author Enumerated_Domain: Enumerated_Domain_Value: 99 Enumerated_Domain_Value_Definition: Arcs were clipped and added from 1:100,000 Digital Line Graphs of hydrology along the Columbia River or straight lines added to close polygons. Enumerated_Domain_Value_Definition_Source: Author Detailed_Description: Entity_Type: Entity_Type_Label: mthhaz.pat Entity_Type_Definition: Polygon attribute table for MTHHAZ Entity_Type_Definition_Source: Field mapping, computer modeling, experience, and interpretation 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 that are automatically generated. Attribute: Attribute_Label: AREA Attribute_Definition: Area of feature in internal units squared. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Attribute: Attribute_Label: PERIMETER Attribute_Definition: Perimeter of feature in internal units. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Attribute: Attribute_Label: MTHHAZ# 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: MTHHAZ-ID 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: PCODE Attribute_Definition: Internal feature number Attribute_Definition_Source: Computed Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 1 Enumerated_Domain_Value_Definition: Proximal Hazard Zone--Vent at or near Crater Rock, which is considered the most likely case during future eruptions. Enumerated_Domain_Value_Definition_Source: Author Enumerated_Domain: Enumerated_Domain_Value: 2 Enumerated_Domain_Value_Definition: Proximal Hazard Zone--Vent on east, north, or west flank, or the summit (a summit vent also would endanger zone coded 1). Enumerated_Domain_Value_Definition_Source: Author Enumerated_Domain: Enumerated_Domain_Value: 3 Enumerated_Domain_Value_Definition: Proximal Hazard Zone--Major valleys that pyroclastic flows and lahars would follow from lava- dome collapses on the upper flanks or summit. As an eruptive episode progresses, one or more of these valleys might become filled with debris, so that pyroclastic flows and lahars could then spill into adjacent valleys and affect a broader sector of a hazard zone. Also includes areas that are affected frequently (several times or more per century) by small lahars and debris avalanches generated by storms and rapid snowmelt. Enumerated_Domain_Value_Definition_Source: Author Enumerated_Domain: Enumerated_Domain_Value: 31 Enumerated_Domain_Value_Definition: Proximal Hazard Zone--Area that may be affected by hazards as described above for PCODE 1 and 3. Enumerated_Domain_Value_Definition_Source: Author Enumerated_Domain: Enumerated_Domain_Value: 32 Enumerated_Domain_Value_Definition: Proximal Hazard Zone--Area that may be affected by hazards as described above for PCODE 2 and 3. Enumerated_Domain_Value_Definition_Source: Author Enumerated_Domain: Enumerated_Domain_Value: 33 Enumerated_Domain_Value_Definition: Proximal Hazard Zone--Area that may be affected by hazards as described above for PCODE 3 and as described below for PCODE 20. Enumerated_Domain_Value_Definition_Source: Author Enumerated_Domain: Enumerated_Domain_Value: 10 Enumerated_Domain_Value_Definition: Distal Hazard Zone--Areas along Sandy River and its tributaries and White River that are subject to lahars generated by eruptions at vent located at or near Crater Rock and to debris avalanches and related lahars generated from steep upper flanks on west and south sides of Mount Hood. Enumerated_Domain_Value_Definition_Source: Author Enumerated_Domain: Enumerated_Domain_Value: 11 Enumerated_Domain_Value_Definition: Distal Hazard Zone--Areas along Hood River that are subject to lahars generated by eruptions at vents located on upper east or north flanks and to debris avalanches and related lahars of about 50 million cubic meters. Enumerated_Domain_Value_Definition_Source: Author Enumerated_Domain: Enumerated_Domain_Value: 20 Enumerated_Domain_Value_Definition: Distal Hazard Zone--Areas along Sandy and Hood Rivers subject to inundation by a debris avalanche and lahar of about 500 million cubic meters, which is considered to be among the largest magnitude events possible at Mount Hood. Enumerated_Domain_Value_Definition_Source: Author Enumerated_Domain: Enumerated_Domain_Value: 50 Enumerated_Domain_Value_Definition: Distal Hazard Zone--Columbia River islands and areas along the Washington shore that could be affected by bank erosion and flooding induced by lahars and sediment-rich floods from Sandy and Hood Rivers during and immediately following eruptions. Enumerated_Domain_Value_Definition_Source: Author Enumerated_Domain: Enumerated_Domain_Value: 99 Enumerated_Domain_Value_Definition: Distal Hazard Zone--Internal polygon (polygon-in-polygon) not included in hazard zone or polygon that represents a lake within an island in the Columbia River. Enumerated_Domain_Value_Definition_Source: Author Overview_Description: Entity_and_Attribute_Overview: MTHHAZ.PAT - Polygon Attribute Table The attributes AREA, PERIMETER, #, -ID are created and maintained automatically for internal use by Arc/INFO software. PCODE is defined as having width of 3, output of 3, and as an integer value. The attribute may have a positve integer value between 0 and 999. Polygon attributes identify the type and nature of different volcanic hazards. Polygons have been separated into proximal (near the volcanic edifice) and distal (more distant from edifice, primarily down major stream drainages) hazard zones. Proximal Hazard Zones Areas subject to rapidly moving, devastating pyroclastic flows and surges, lahars, and debris avalanches that can sweep out to the hazard boundary in less than 30 minutes. Also subject to ballistic projectiles and lava flows. Subdivided into two zones depending on vent location. PCODE VALUE DESCRIPTION 1 Vent at or near Crater Rock, which is considered the most likely case during future eruptions. 2 Vent on east, north, or west flank, or the summit (a summit vent also would endanger zone coded 1). 3 Major valleys that pyroclastic flows and lahars would follow from lava- dome collapses on the upper flanks or summit. As an eruptive episode progresses, one or more of these valleys might become filled with debris, so that pyroclastic flows and lahars could then spill into adjacent valleys and affect a broader sector of a hazard zone. Also includes areas that are affected frequently (several times or more per century) by small lahars and debris avalanches generated by storms and rapid snowmelt. 31 Area that may be affected by hazards as described above for PCODE 1 and 3. 32 Area that may be affected by hazards as described above for PCODE 2 and 3. 33 Area that may be affected by hazards as described above for PCODE 3 and as described below for PCODE 20. Distal Hazard Zones Valleys heading on Mount Hood that are subject to lahars and debris avalanches. Marks along the valley floor show the estimated travel time for lahars of the size used to define zones DA and DB. Subdivided into three zones on the basis of vent location, event magnitude, and probability of inundation. 10 Areas along Sandy River and its tributaries and White River that are subject to lahars generated by eruptions at vent located at or near Crater Rock and to debris avalanches and related lahars generated from steep upper flanks on west and south sides of Mount Hood. 11 Areas along Hood River that are subject to lahars generated by eruptions at vents located on upper east or north flanks and to debris avalanches and related lahars of about 50 million cubic meters. 20 Areas along Sandy and Hood Rivers subject to inundation by a debris avalanche and lahar of about 500 million cubic meters, which is considered to be among the largest magnitude events possible at Mount Hood. 50 Columbia River islands and areas along the Washington shore that could be affected by bank erosion and flooding induced by lahars and sediment-rich floods from Sandy and Hood Rivers during and immediately following eruptions. 99 Internal polygon (polygon-in-polygon) not included in hazard zone or polygon that represents a lake within an island in the Columbia River. MTHHAZ.AAT - Arc Attribute Table FNODE#, TNODE#, LPOLY#, RPOLY#, LENGTH, #, -ID are created and maintained automatically for internal use by Arc/INFO software. Attribute LCODE is defined as having width of 3, output of 3, and as an integer value. The attribute may have a positve integer value between 0 and 999. Arcs were given the attribute LCODE to indicate whether they should be drawn (LCODE = 1) or should not be drawn (LCODE = 99) when plotting the Mount Hood hazard zonation map. Arcs were given an attribute of SOURCE to indicate the original method used to create the given arc as described below: SOURCE VALUE DESCRIPTION 1 Arcs were digitized from stable Mylar bases containing hazard zonation boundaries. 2 Arcs were digitized from stable Mylar bases containing hazard zonation boundaries guided by output from flood routing computer model (DAMBRK). 3 Arcs were derived from lahar inundation computer model (LAHARZ) using GIS software and Digital Elevation Model. 99 Arcs were clipped and added from 1:100,000 Digital Line Graphs of hydrology along the Columbia River or straight lines added to close polygons. Entity_and_Attribute_Detail_Citation: Not Available Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: mtharr.pat Entity_Type_Definition: Point attributes Entity_Type_Definition_Source: Scientific Interpretation 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 that are automatically generated Attribute: Attribute_Label: AREA Attribute_Definition: Area of feature in internal units squared. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 0 Enumerated_Domain_Value_Definition: - Enumerated_Domain_Value_Definition_Source: - 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: Enumerated_Domain: Enumerated_Domain_Value: Sequential unique positive integer Enumerated_Domain_Value_Definition: - Enumerated_Domain_Value_Definition_Source: - Unrepresentable_Domain: Perimeter is always zero for point coverages. Values are automatically generated. Attribute: Attribute_Label: MTHARR# 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: MTHARR-ID Attribute_Definition: Internal feature number. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Attribute: Attribute_Label: TIME Attribute_Definition: estimated travel time for potential lahars Attribute_Definition_Source: Scientific Interpretation Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Integer values Enumerated_Domain_Value_Definition: Value represents travel time in hours and minutes from source to point on map Enumerated_Domain_Value_Definition_Source: Author Attribute: Attribute_Label: ANGLE Attribute_Definition: Rotation angle of the arrow marker Attribute_Definition_Source: Scientific modeling and empirical Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Integer values 0 - 360 Enumerated_Domain_Value_Definition: Angle in degrees Enumerated_Domain_Value_Definition_Source: Author Overview_Description: Entity_and_Attribute_Overview: MTHARR.PAT - Point Attribute Table The attributes AREA, PERIMETER, #, -ID are created and maintained automatically for internal use by Arc/INFO software. TIME is defined as having width of 4, output of 4, and as a character value. The attribute may have integer as character values between 0 and 99, a ':', and integer character values between 0 and 60. ANGLE is defined as having width of 3, output of 3, and is an integer value between 0 and 360 indicating the rotation angle of the arrow marker. Entity_and_Attribute_Detail_Citation: Not Available Distribution_Information: Resource_Description: Downloadable Data Distribution_Liability: The USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Distribution of the database files assumes that all components of the database will be used together. Use of any one ArcInfo coverage outside the context of the other coverages is considered inappropriate or misuse. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Transfer_Size: 0.237 Metadata_Reference_Information: Metadata_Date: 20060815 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Schilling, Steve P. Contact_Organization: USGS Cascade Volcano Observatory Contact_Address: Address_Type: mailing and physical address Address: 1300 Cardinal Ct. Suite 100 City: Vancouver State_or_Province: WA Postal_Code: 98683 Country: USA Contact_Voice_Telephone: (360) 993-8900 Contact_Facsimile_Telephone: (360) 993-8980 Contact_Electronic_Mail_Address: sschilli@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_Security_Information: Metadata_Security_Classification_System: None Metadata_Security_Classification: Unclassified Metadata_Security_Handling_Description: None Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile