Landslide Hazards along River Corridors - Top of main landslide (steep slopes on top of a slide)

Metadata also available as - [Outline]

Frequently-anticipated questions:

What does this data set describe?

Title:
Landslide Hazards along River Corridors - Top of main landslide (steep slopes on top of a slide)
Abstract:
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.
Supplemental_Information:
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 - Top of main landslide (steep slopes on top of a slide): King County, King County, WA.

    Online Links:

    Other_Citation_Details: None

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -122.301036
    East_Bounding_Coordinate: -121.231455
    North_Bounding_Coordinate: 47.780214
    South_Bounding_Coordinate: 47.137566

  3. What does it look like?

    <http://www5.kingcounty.gov/sdc/DataImages/lsr_ds_topofmainscarp.jpg> (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 (832)

    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?

    Top of main landslide (steep slopes on top of a slide)
    line data table (Source: King County)

    OBJECTID
    Internal feature number. (Source: Esri)

    Sequential unique whole numbers that are automatically generated.

    lsID
    Identification number (Source: King County)

    Range of values
    Minimum:2.0
    Maximum:1061.0

    isParent
    Answers if this is a parent landslide (Source: King County)

    ValueDefinition
    N 

    parentID
    Identification number of parent landslide (Source: King County)

    Range of values
    Minimum:2.0
    Maximum:1061.0

    slopeSetti
    Slope setting (Source: King County)

    ValueDefinition
     
    Modified 
    Natural 

    relativeAg
    Relative age (Source: King County)

    ValueDefinition
     
    Historic 
    Pre-historic 
    Unknown 

    Mapby
    Author of mapped shapes (Source: King County)

    ValueDefinition
    KC DNRP DPER 
    SDN 

    LidarDate
    Date Author completed mapping (Source: King County)

    UNREPRESENTED DOMAIN

    headscarp
    Confidence score of feature (Source: King County)

    otherFeatu
    Confidence score of feature (Source: King County)

    morphology
    Confidence score of feature (Source: King County)

    toeDeposit
    Confidence score of feature (Source: King County)

    midpointX
    (Source: King County)

    Range of values
    Minimum:1279457.80339
    Maximum:1541233.03111

    midpointY
    (Source: King County)

    Range of values
    Minimum:53987.9581538
    Maximum:284697.722761

    totalConfi
    Total confidence score for landslide (Source: King County)

    Range of values
    Minimum:0.0
    Maximum:40.0

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

    ValueDefinition
    Modified 
    Top of Headscarp 

    lengthFt
    (Source: King County)

    Range of values
    Minimum:96.63822149
    Maximum:12817.1969079

    confidence
    Rating associated with total confidence score (Source: King County)

    ValueDefinition
     
    High 
    Low 
    Moderate 

    MapDate
    Date Author completed mapping (Source: King County)

    ValueDefinition
    12/30/2015 
    6/20/2016 

    MapMethod
    Method used to map deep-seated slides (Source: King County)

    ValueDefinition
    OR DOGAMI Spec Paper 42 

    LiDARSourc
    Source LiDAR imagery (Source: King County)

    ValueDefinition
    KC GIS 
    KCWLRD 

    Shape
    Feature geometry. (Source: Esri)

    Coordinates defining the features.

    Shape.len

    Entity_and_Attribute_Detail_Citation: King County

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  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
    c/o Ken Rauscher
    GIS Analyst
    201 S Jackson St, Suite 706
    Seattle, WA 98104
    US

    206-477-4414 (voice)

Why was the data set created?

Suitable for general reference and analyses. Identifies only the top of the main landslide (steep slopes on top of a slide) 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?

How reliable are the data; what problems remain in the data set?

How can someone get a copy of the data set?

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

Access_Constraints:
Access Constraint: Data is not available on GIS Data Portal, it may be available via a custom data request
Use_Constraints:
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
    c/o Cheryl Wilder
    Data Sales Coordinator
    201 S Jackson St, Suite 706
    Seattle, WA 98104
    US

    206-477-4421 (voice)

  2. What's the catalog number I need to order this data set?

    /plibrary2/enviro/shapes/arc/lsr_ds_topofmainscarp.shp

  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.

  4. How can I download or order the data?

Who wrote the metadata?

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

206-477-4414 (voice)
firstname.lastname@kingcounty.gov

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

Generated by mp version 2.8.24 on Mon Sep 18 19:49:12 2023