Landslide Hazards along River Corridors - Watercourses (paths where water can travel downslope)

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What does this data set describe?

Landslide Hazards along River Corridors - Watercourses (paths where water can travel downslope)
Where fluvial or coastal erosion has created steep, high slopes in glacial sediments, these slopes sometimes fail in large, deep-seated landslides. The segregation of landslides into deep and shallow is somewhat arbitrary and different investigators have used different criteria to differentiate these landslides. For this project, the differentiation follows the criteria proposed by Burns and Madin (2009) that deep-seated slides extend to a depth of more than 15 ft. (4.6 m.). In general this corresponds to individual landslides which are large enough to be distinct on hillshade images generated from LiDAR data. For this mapping, deep-seated landslides may include features where the failure plane is more than 15 ft. deep or where landslide debris accumulates to a depth of more than 15 ft. In King County, a variety of landslide types occur at a scale that may create deep-seated landslides.
King County retained Shannon & Wilson to map deep-seated landslides within the study limits using the procedure in the Oregon State Department of Geology and Mineral Industries (OR DOGAMI) Special Paper 42 (Burns and Madin 2009). Shannon and Wilson mapped 930 deep-seated landslides in the study area during this work. A report prepared by Shannon & Wilson to accompany their mapping is included as Appendix A of the report. Many features of deep-seated landslides share similar topographic characteristics including steep, often arcuate head scarps defining the upslope limit of the slide and a distinct deposit of displaced debris downslope. The debris was often identifiable by its lobate form and hummocky upper surface. These features varied in their topographic distinctness from features that appeared sharp and unambiguous to features that were muted and subtle. It is likely that some features mapped as slides based on their topographic character may have formed in other ways and it is also likely that some prehistoric deep-seated landslides present in the study limits were not identified because they were not distinguishable with the available imaging. A numerical confidence rating method set by the DOGAMI method (e.g., headscarp and slide morphology) was used to assign ratings to each mapped landslide. Twenty attributes, i.e. relative age of landslide, LiDAR source and date, and whether the slide appeared natural or human modified, of each landslide, were documented.
  1. How should this data set be cited?

    County, King, 20160816, Landslide Hazards along River Corridors - Watercourses (paths where water can travel downslope): King County, King County, WA.

    Online Links:

    Other_Citation_Details: None

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -122.280093
    East_Bounding_Coordinate: -121.253459
    North_Bounding_Coordinate: 47.778386
    South_Bounding_Coordinate: 47.138861

  3. What does it look like?

    <> (JPG)
    JPG File of layer overlain on base of WA counties or local cities

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 30-Dec-2015
    Currentness_Reference: publication date

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • String (802)

    2. What coordinate system is used to represent geographic features?

      The map projection used is NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet.

      Projection parameters:
      Standard_Parallel: 47.5
      Standard_Parallel: 48.73333333333333
      Longitude_of_Central_Meridian: -120.8333333333333
      Latitude_of_Projection_Origin: 47.0
      False_Easting: 1640416.666666667
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.00032808333333333333
      Ordinates (y-coordinates) are specified to the nearest 0.00032808333333333333
      Planar coordinates are specified in foot_us

      The horizontal datum used is D North American 1983 HARN.
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?

    Watercourses (paths where water can travel downslope)
    line data table (Source: King County)

    Internal feature number. (Source: Esri)

    Sequential unique whole numbers that are automatically generated.

    Name of feature of deep-seated landslide (Source: King County)


    Identification number of parent (Source: King County)

    Range of values

    Feature setting (Source: King County)


    Author of mapped shapes (Source: King County)


    Source LiDAR imagery (Source: King County)


    Date imagery data sent to Author (Source: King County)


    (Source: King County)

    Range of values

    (Source: King County)

    Range of values

    (Source: King County)

    Range of values

    Feature geometry. (Source: Esri)

    Coordinates defining the features.


    Entity_and_Attribute_Detail_Citation: King County

Who produced the data set?

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  3. To whom should users address questions about the data?

    King County King County Dept of Natural Resources and Parks, Water and Lands Resource Division
    Attn: Ken Rauscher
    GIS Analyst
    201 S Jackson St, Suite 706
    Seattle, WA 98104

    206-477-4414 (voice)

Why was the data set created?

Suitable for general reference and analyses. Identifies only watercourses (paths where water can travel downslope) identified on deep seated landslides mapped within the river corridor study limits in King County.

How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

  3. What similar or related data should the user be aware of?

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Are there legal restrictions on access or use of the data?

Access Constraint: Data is not available on GIS Data Portal, it may be available via a custom data request
Use Constraint: King County data are made available with the understanding that they shall be used exclusively by the obtainer or his/her authorized agents. Digital products may not be reproduced or redistributed in any form or by any means without the express written authorization of King County.

  1. Who distributes the data set? (Distributor 1 of 1)

    KCGIS Center
    Attn: Cheryl Wilder
    Data Sales Coordinator
    201 S Jackson St, Suite 706
    Seattle, WA 98104

    206-477-4421 (voice)

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  3. What legal disclaimers am I supposed to read?

    Distribution Liability: King County disclaims any warranty of use of any digital product or data beyond that for which it was designed.

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Who wrote the metadata?

Last modified: 13-Oct-2016
Metadata author:
King County King County Dept of Natural Resources and Parks, Water and Lands Resource Division
Attn: Ken Rauscher
GIS Analyst
201 S Jackson St, Suite 706
Seattle, WA 98104

206-477-4414 (voice)

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Generated by mp version 2.9.12 on Sat Apr 06 04:30:47 2019