Identification_Information: Citation: Citation_Information: Originator: Adam R. Mosbrucker, Kurt R. Spicer, Jon J. Major, Dennis R. Saunders, Tami S. Christianson, and Cole G. Kingsbury Publication_Date: 2015 Title: Digital Database of Channel Cross-Section Surveys, Mount St. Helens, Washington (ver. 1.2, September 2023) Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Data Series Issue_Identification: DS 951 Publication_Information: Publication_Place: Reston, Virginia Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.3133/ds951 Description: Abstract: Stream-channel cross-section survey data are a fundamental component to studies of fluvial geomorphology. Such data provide important parameters required by many open-channel flow models, sediment transport equations, sediment budget computations, and flood hazard assessments. At Mount St. Helens, Washington, the long-term response of channels to the May 18, 1980 eruption, which dramatically altered the hydrogeomorphic regime of several drainages, is documented by an exceptional time-series of repeat stream channel cross-section surveys. More than 300 cross sections, most established shortly following the eruption, represent more than 100 kilometers (km) of surveyed topography. Although selected cross sections have been published previously in print form, we present a comprehensive digital database that includes geospatial and tabular data. Furthermore, survey data are referenced to a common geographic projection and to common datums. Database design, maintenance, and data dissemination are accomplished through a geographic information system (GIS) platform, which integrates survey data acquired with theodolite, total station, and global navigation satellite system (GNSS) instrumentation. Users can interactively perform advanced queries and geospatial time-series analysis. An accuracy assessment provides users the ability to quantify uncertainty within these data. At the time of publication, this project is ongoing. Regular database updates are expected; users are advised to confirm they are using the latest version. Purpose: This database presents more than 30 years of repeated stream-channel cross-section surveys on basins draining Mount St. Helens, Washington. The long-term monitoring effort documents channel development, evolution, and storm-induced fluvial geomorphologic changes of the eruption-altered channels. These data also provide important parameters required by many open-channel flow models, sediment-transport equations, sediment-budget computations, and flood-hazard assessments. Supplemental_Information: This dataset will be updated on a regular basis; version 1.2 is current as of September 2023. Time_Period_of_Content: Time_Period_Information: Multiple_Dates/Times: Single_Date/Time: Beginning_Date: 1980 Single_Date/Time: Ending_Date: ongoing Currentness_Reference: September 2023 Status: Progress: In work Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -122.909483 East_Bounding_Coordinate: -121.995889 North_Bounding_Coordinate: 46.385286 South_Bounding_Coordinate: 46.071702 Keywords: Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: environment Theme_Keyword: geoscientific Theme_Keyword: inland waters Theme_Keyword: river Theme_Keyword: stream channel cross-section survey Theme_Keyword: fluvial geomorphology Theme_Keyword: sediment Place: Place_Keyword_Thesaurus: none Place_Keyword: Loowit Place_Keyword: Step Place_Keyword: Carbonate Place_Keyword: Coldwater Place_Keyword: Castle Place_Keyword: Toutle Place_Keyword: Muddy Place_Keyword: Clear Place_Keyword: Clearwater Place_Keyword: Pine Place_Keyword: Smith Place_Keyword: Mount St. Helens Place_Keyword: Cascade Range Place_Keyword: Washington Place_Keyword: USA Access_Constraints: None Use_Constraints: Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Adam R. Mosbrucker Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing address Address: 1300 SE Cardinal Court, Building 10, Suite 100 City: Vancouver State_or_Province: WA Postal_Code: 98683 Country: USA Contact_Voice_Telephone: 360-993-8975 Contact_Electronic_Mail_Address: amosbrucker@usgs.gov?subject=MSH_cross_section Data_Set_Credit: This database is designed and maintained by the U.S. Geological Survey (USGS) Cascades Volcano Observatory. Security_Information: Security_Classification_System: none Security_Classification: Unclassified Security_Handling_Description: none Native_Data_Set_Environment: Microsoft Windows 7 Enterprise Service Pack 1; ESRI ArcGIS 10.1.1.3143 Data_Quality_Information: Logical_Consistency_Report: This is a vector digital file and does not contain topologic relationships. Attribute table may contain NULL values. Completeness_Report: These data completely describe the topographic surface of the surveyed areas near Mount St. Helens. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Absolute horizontal accuracy is directly related to cross section quality. Absolute and relative accuracy are described in detail within the associated data series report, which can be found at https://doi.org/10.3133/ds951. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Relative vertical accuracy is directly related to Global Navigation Satellite System (GNSS or GPS) position solutions, which are described in detail within the associated data series report, which can be found at https://doi.org/10.3133/ds951. Lineage: Process_Step: Process_Description: Cross-section survey lines were digitized from scanned and georeferenced 7.5-minute USGS topographic maps. Monument locations, sourced from aggregated Global Navigation Satellite System (GNSS or GPS) data, were used to adjust the digitized polylines within a geographic information system (GIS). Attribute data, including relative field-based hyperlinks, were added to each cross section using manual and automated tools within a GIS. Survey data files (.xls and .jpg) were organized into a file folder structure. These files, in addition to a data series report and metadata, comprise the database. Process_Date: 2023 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Adam R. Mosbrucker Contact_Position: Hydrologic Technician Contact_Address: Address_Type: mail Address: 1300 SE Cardinal Court, Building 10, Suite 100 City: Vancouver State_or_Province: WA Postal_Code: 98683 Country: USA Contact_Voice_Telephone: 360-993-8975 Contact_Facsimile_Telephone: 360-993-8980 Contact_Electronic_Mail_Address: amosbrucker@usgs.gov Contact_Instructions: please contact via e-mail Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: NAD 1983 UTM Zone 10N Transverse Mercator: Longitude_of_Central_Meridian: -123.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000.0 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000000002220024164500956 Ordinate_Resolution: 0.000000002220024164500956 Planar_Distance_Units: meter Geodetic_Model: Horizontal_Datum_Name: D North American 1983 Ellipsoid_Name: GRS 1980 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257222101 Vertical_Datum: Survey data were converted to orthometric elevations (NAVD88) in meters by applying a GEOID03, GEOID09, GEOID12A, or GEOID12B correction. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S Geological Survey Contact_Address: Address_Type: mailing address Address: Box 25286 Address: Denver Federal Center City: Denver State_or_Province: Colorado Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-202-4200 Contact_Voice_Telephone: 1-888-ASK-USGS Contact_Facsimile_Telephone: 303-202-4695 Contact_Electronic_Mail_Address: infoservices@usgs.gov Resource_Description: Downloadable Data Distribution_Liability: Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ESRI Shapefile Format_Version_Date: Format_Specification: ESRI Shapefile File_Decompression_Technique: WinZip Transfer_Size: 9.6 MB Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.3133/ds951 Fees: free Entity_and_Attribute_Information Detailed: survey_lines Label: survey_lines Definition: Attribute polyline feature class containing information and relative hyperlinks. Definition_Source: U.S. Geological Survey Attribute: Label: FID Definition: Internal feature identification number. Definition_Source: Esri Unrepresented_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Label: Shape Definition: Feature geometry. Definition_Source: Esri Unrepresented_Domain: Coordinates defining the features. Attribute: Label: Label Definition: Unique cross section identifier. Numbers increase downstream (that is, "NF120" is upstream of "NF130"). Definition_Source: USGS Attribute: Label: Quality Definition: Quality code. Highest quality location is "rectified," medium-quality is "interpreted," and lowest-quality is "unrectified." These are described in detail in associated Data Series report. Definition_Source: USGS Attribute: Label: First_Surv Definition: Year of first survey. NULL values are indicated as "0". Definition_Source: USGS Attribute: Label: Last_Surv Definition: Year of latest survey. NULL values are indicated as "0". Definition_Source: USGS Attribute: Label: Shape_Length Definition: Length of survey line in meters as represented by the database. Definition_Source: USGS Attribute: Label: Surv_JPG_L Definition: Field-based relative hyperlink to PLOT_JPG files containing sample plots of tabular survey data. Definition_Source: USGS Attribute: Label: Surv_XLS_L Definition: Field-based relative hyperlink to XLS files containing tabular survey data in meters. These are described in detail in associated data series report. Definition_Source: USGS Attribute: Label: Included Definition: Indicates if tabular survey data and sample plots are included in the current version of the database. If "yes", then hyperlinks will function properly. If "no", hyperlinks will not function. Definition_Source: USGS Metadata_Reference_Information: Metadata_Date: 2023 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Adam R. Mosbrucker Contact_Position: Hydrologic Technician Contact_Address: Address_Type: mail Address: 1300 SE Cardinal Court, Building 10, Suite 100 City: Vancouver State_or_Province: WA Postal_Code: 98683 Country: US Contact_Voice_Telephone: 360-993-8975 Contact_Facsimile_Telephone: 360-993-8980 Contact_Electronic_Mail_Address: amosbrucker@usgs.gov Contact_Instructions: please contact via e-mail Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998