Geomorphic Surface Boundaries for the Lower 7.5 Kilometers of the Taiya River Valley, Alaska, 2018

Identification_Information:

Citation:

Citation_Information:

Originator: Janet H. Curran
Publication_Date: 20200811
Title:

Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polygon)
Publication_Information:

Publication_Place: Anchorage, AK
Publisher: U.S. Geological Survey, Alaska Science Center

Other_Citation_Details:

Curran, J.H., 2020, Geomorphic surface and channel boundaries for the lower 7.5 kilometers of the Taiya River Valley, southeast Alaska, 2018: U.S. Geological Survey data release, https://doi.org/10.5066/P9XP1SE7

Online_Linkage: https://doi.org/10.5066/P9XP1SE7
Larger_Work_Citation:

Citation_Information:

Originator: Curran, Janet H.
Publication_Date: 2018
Title:

Hydrology of the lower Taiya River and the influence of the West Creek tributary, Klondike Gold Rush National Historic Park, Alaska

Geospatial_Data_Presentation_Form: Website
Series_Information:

Series_Name: ASC Science Portal
Issue_Identification: 414

Publication_Information:

Publication_Place: Anchorage, AK
Publisher: USGS, Alaska Science Center

Other_Citation_Details:

This is a link to the broader USGS Alaska Science Center research project supported by these data. Users will find a description of the research project and links to associated reports, publications, and data products.

Online_Linkage: https://alaska.usgs.gov/portal/project.php?project_id=414

Description:

Abstract:

The USGS mapped geomorphic features in the lower 7.5 kilometers of the Taiya River valley bottom in and near Klondike Gold Rush National Historical Park near Skagway, Alaska. This dataset presents delineations of geomorphic surfaces. Geomorphic surface boundaries were prepared from 2003 lidar elevation data and updated using 2017 and 2018 aerial orthophotographs at eroding riverbanks, such that the dataset generally represents 2018 conditions. Interpretations of surface age primarily used 2003 lidar data and aerial imagery from 1948 and 2003. Mapped surfaces consist of the 2003 active main stem (Taiya River and West Creek wetted channel, bars, islands, and major sloughs), additional areas recruited to the main stem by 2018, main stem surfaces abandoned between the 1940s and 2003, main stem surfaces abandoned prior to the 1940s, alluvial fans, and emergent tidal flats.

Purpose:

The Taiya River near Skagway, Alaska, along with much of its river valley, is situated in the Chilkoot Trail Unit of Klondike Gold Rush National Historic Park, an area rich in history and recreational resources that also forms an important ecological corridor. As part of the Natural Resources Preservation Program, a science partnership between the U.S. Geological Survey (USGS) and National Park Service, the USGS conducted a reconnaissance of hydrologic and geomorphic processes in the lower 7.5 kilometers of the Taiya River valley bottom, which includes the confluence with major tributary West Creek. The project used historical streamflow and sediment data, aerial imagery, and high-resolution topographic data, supplemented with collection of suspended sediment data and ground observations of landforms and processes, to document hydrologic conditions and the geomorphic history, forms, and processes of Taiya River valley bottom surfaces and channels. Information from the study is intended to help land managers conduct planning, management, and resource conservation activities, request additional studies, or develop monitoring plans.

Supplemental_Information:

A companion dataset, Off-Main-Stem Channels in the Lower 7.5 Kilometers of the Taiya River Valley, Alaska, 2018, contains delineations of off-main-stem channels.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 2003
Ending_Date: 2018

Currentness_Reference: ground condition

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -135.365
East_Bounding_Coordinate: -135.330
North_Bounding_Coordinate: 59.554
South_Bounding_Coordinate: 59.489

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ASC290

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: stream discharge
Theme_Keyword: river systems
Theme_Keyword: geomorphology

Theme:

Theme_Keyword_Thesaurus: Coastal and Marine Ecological Classification Standard
Theme_Keyword: Riverine Estuary
Theme_Keyword: Slough
Theme_Keyword: Tidal Flat

Theme:

Theme_Keyword_Thesaurus: Alexandria Digital Library Feature Type Thesaurus
Theme_Keyword: rivers
Theme_Keyword: alluvial fans

Theme:

Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: river
Theme_Keyword: river bank
Theme_Keyword: river channel
Theme_Keyword: river discharge

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: inlandWaters
Theme_Keyword: geoscientificInformation

Place:

Place_Keyword_Thesaurus: Geographic Names Information System
Place_Keyword: Alaska
Place_Keyword: Taiya River
Place_Keyword: Dyea
Place_Keyword: Taiya Inlet
Place_Keyword: Chilkoot Trail
Place_Keyword: Skagway
Place_Keyword: Klondike Gold Rush National Historical Park

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: West Creek

Access_Constraints: None
Use_Constraints:

If you use these data in a publication, presentation, or other product, it is requested that you credit USGS and the authors of this data for their contribution to your work. See Primary Citation, Other Citation Details for a suggested citation.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Janet H. Curran
Contact_Organization: U.S. Geological Survey, Alaska Science Center

Contact_Address:

Address_Type: Mailing
Address: 4210 University Drive
City: Anchorage
State_or_Province: AK
Postal_Code: 99508

Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov

Data_Set_Credit:

This study was prepared in cooperation with the National Park Service.

Native_Data_Set_Environment:

Environment as of Metadata Creation: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.6.1 (Build 9270) Service Pack N/A (Build N/A)

Cross_Reference:

Citation_Information:

Originator: Curran, Janet H.
Publication_Date: 2020
Title:

Hydrology and Geomorphology of the Taiya River Near the West Creek Tributary, Southeast Alaska

Geospatial_Data_Presentation_Form: document
Series_Information:

Series_Name: Scientific Investigations Report
Issue_Identification: 2020-5059, 57 pp.

Publication_Information:

Publication_Place: Online
Publisher: U.S. Geological Survey

Online_Linkage: https://doi.org/10.3133/sir20205059

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Basis for interpretation of geomorphic surfaces is discussed in the cross-referenced USGS report. Data were peer reviewed prior to dissemination.

Logical_Consistency_Report:

Snapping and editing procedures were used to ensure polygons were completely enclosed and did not overlap. Only categories within the mapping framework hierarchy were used in attribute assignment.

Completeness_Report:

Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. This study focused on fluvial surfaces and omitted small features that might be related to other processes. See cross-referenced USGS report for discussion.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. The accuracy of the delineations is closely linked to the accuracy of the underlying datasets, primarily the 2003 Chilkoot Trail unit lidar data, which has a 1.4-1.7 m post spacing and is presented as 1 m pixels, and also the 1:12,000-scale 2017 Digital Globe Orthophoto and 1:12,000 2018 Digital Globe Satellite Orthophoto (for the lower 2 kilometers of the valley) for a few locations.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Quantum Spatial
Publication_Date: 2017
Title: Chilkoot Trail and White Pass Lidar
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:

Publication_Place: Anchorage, Alaska
Publisher: National Park Service

Type_of_Source_Media: Digital and/or Hardcopy Resources
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20030519
Ending_Date: 20030520

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: 2003 Chilkoot Trail lidar
Source_Contribution: Base map for geomorphic mapping

Source_Information:

Source_Citation:

Citation_Information:

Originator: Aeromap U.S.
Publication_Date: 2003
Title: Chilkoot Trail Orthophoto
Geospatial_Data_Presentation_Form: remote-sensing image

Source_Scale_Denominator: 40000
Type_of_Source_Media: digital database file
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20030701

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: 1948 USGS aerial photograph
Source_Contribution:

Reference for identification of relative age of geomorphic surfaces

Source_Information:

Source_Citation:

Citation_Information:

Originator: Aeromap U.S.
Publication_Date: 2003
Title: Chilkoot Trail Orthophoto
Geospatial_Data_Presentation_Form: remote-sensing image

Source_Scale_Denominator: 12000
Type_of_Source_Media: digital database file
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20030701

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: 2003 Chilkoot Trail Orthophoto
Source_Contribution: Reference for feature identification

Source_Information:

Source_Citation:

Citation_Information:

Originator: DigitalGlobe
Publication_Date: Unknown
Title: 2017 DigitalGlobe Satellite Orthophoto
Geospatial_Data_Presentation_Form: remote-sensing image
Other_Citation_Details: DigitalGlobe item no. 057739118010

Source_Scale_Denominator: 12000
Type_of_Source_Media: online
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20170309

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: 2017 DigitalGlobe Orthophoto
Source_Contribution: Reference for identification of changes since 2003.

Source_Information:

Source_Citation:

Citation_Information:

Originator: DigitalGlobe
Publication_Date: Unknown
Title: 2018 DigitalGlobe Satellite Orthophoto
Geospatial_Data_Presentation_Form: remote-sensing image
Publication_Information:

Publication_Place: online
Publisher: DigitalGlobe

Other_Citation_Details: DigitalGlobe item no. 057748163010

Source_Scale_Denominator: 12000
Type_of_Source_Media: online
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20180325

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: 2018 Orthophoto
Source_Contribution:

Reference for identification of changes since 2003 in lower 2 kilometers of valley bottom.

Process_Step:

Process_Description:

A percent slope map was derived from the 2003 Chilkoot Trail lidar and used to generate 15-percent slope contours using ArcGIS tools. In a polyline shapefile, geomorphic surfaces and off-main-stem channels were outlined using the editing Trace tool to trace 15-percent slope contours and digitizing at 1:2,000 as needed to connect contours or draw surface boundaries lacking a distinct break in slope. Locations of active and historically active geomorphic surfaces and off-main-stem channels were mapped for 2003 conditions, except for small areas eroded by the main stem by 2018, for which boundaries were digitized at about 1:2,000 from aerial orthophotographs. Fluvial surfaces were assigned a relative age from interpretation of the 2003 lidar and 1948, 2003, 2017, and 2018 imagery. Lines were converted to polygons using ArcGIS tools and polygons were dissolved by a designated attribute to create a separate surfaces file. Non-off-main-stem polygons in the original polygon file were deleted to produce the off-main-stem channels file.

Process_Date: 2018

Process_Step:

Process_Description:

Geomorphic surface area in square kilometers was computed for each feature using ArcGIS tools.

Process_Date: 2018

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 6

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:

UTM_Zone_Number: 8
Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -135.0
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000.0
False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:

Abscissa_Resolution: 0.6096
Ordinate_Resolution: 0.6096

Planar_Distance_Units: Meter

Geodetic_Model:

Horizontal_Datum_Name: D_North_American_1983
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: Taiya_valley_surfaces
Entity_Type_Definition:

Mapped geomorphic surfaces along the lower 7.5 kilometers of the Taiya River valley bottom, Alaska.

Entity_Type_Definition_Source: Producer defined

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: surf_type
Attribute_Definition: Type of geomorphic surface
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: alluvial fan
Enumerated_Domain_Value_Definition:

Alluvial fans formed by tributaries to the Taiya River, includes active channel for smaller fans

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: emergent tidal flat
Enumerated_Domain_Value_Definition: Uplifted former tidal surfaces not fluvially reworked
Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: main stem abandoned between 1940s and 2003
Enumerated_Domain_Value_Definition:

Former channels and bars of the main stem Taiya River and West Creek that were abandoned between 1940s-2003

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: main stem abandoned prior to 1940s
Enumerated_Domain_Value_Definition:

Former channels and bars of the Taiya River and West Creek that were abandoned prior to the 1940s

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: main stem activated between 2003 and 2018
Enumerated_Domain_Value_Definition:

Wetted channels and unvegetated bars of the Taiya River and West Creek incorporated into the main stem since 2003

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: main stem active in 2003
Enumerated_Domain_Value_Definition:

Wetted channel and unvegetated to lightly vegetated bars of the Taiya River and West Creek

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute:

Attribute_Label: area_sqkm
Attribute_Definition: Area of geomorphic surface, in square kilometers
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.066483
Range_Domain_Maximum: 2.536817
Attribute_Units_of_Measure: square kilometers

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey, Alaska Science Center

Contact_Address:

Address_Type: mailing address
Address: 4210 University Drive
City: Anchorage
State_or_Province: AK
Postal_Code: 99508
Country: United States

Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov

Resource_Description:

The distributor is the authoritative source for this data. The dataset is available in ESRI shapefile format for display in a Geographic Information System (GIS) and in Keyhole Markup Language (KML) format for display in a virtual globe.

Distribution_Liability:

Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by 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.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: KML
Format_Information_Content:

Data are distributed in a Zip package containing data in KML format and Shapefile formats, FGDC metadata in XML and HTML formats.

File_Decompression_Technique:

Compression applied by the 7-Zip utility using default compression (5). The file can be decompressed and unpacked by open source or commercially available unzip tools.

Transfer_Size: 6.00

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: https://doi.org/10.5066/P9XP1SE7

Fees: None

Geomorphic Surface Boundaries for the Lower 7.5 Kilometers of the Taiya River Valley, Alaska, 2018

Metadata: