Landslide Hazards along River Corridors - Rock avalanche deposit

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Frequently anticipated questions:

What does this data set describe?

Landslide Hazards along River Corridors - Rock avalanche deposit
Rock avalanche is a style of landslide characterized by the simultaneous failure of an entire bedrock hillslope and with the dislodged mass cascading to the valley below. Rock avalanches move at extremely high speeds and are potentially massive in size. They can extend farther from the base of slope and cover a much larger area compared with individual rock fall.
Rock avalanche deposits were identified within the study limits using USGS geologic maps, review of LiDAR imagery, interpretation of orthophotography, field investigation, and geotechnical reports. The figure below is an example of a rock avalanche deposit mapped in the South Fork Skykomish River valley. Due to the lack of detailed information on significant variables including rock strength, zones of weakness and joint patterns, predictions of future sites of rock avalanches were not feasible.
  1. How should this data set be cited?

    County, King, 20160816, Landslide Hazards along River Corridors - Rock avalanche deposit: King County, King County, WA.

    Online Links:

    Other_Citation_Details: None

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -121.757133
    East_Bounding_Coordinate: -121.278054
    North_Bounding_Coordinate: 47.763787
    South_Bounding_Coordinate: 47.525641

  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: 20-Jun-2016
    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):

      • GT-polygon composed of chains (3)

    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?

    Rock avalanche deposit
    area data table (Source: King County)

    Internal feature number. (Source: Esri)

    Sequential unique whole numbers that are automatically generated.

    Author of mapped shapes (Source: King County)


    (Source: King County)

    Beckler Peak 
    Index Creek 
    Moon Valley Rd-Mt Si 

    Date Author completed mapping (Source: King County)


    Method to map deposits (Source: King County)

    USGS Maps 

    Source LiDAR imagery and date imagery data sent to Author (Source: King County)

    KC GIS 2016-06 

    Feature geometry. (Source: Esri)

    Coordinates defining the features.



    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
    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 rock avalanche deposits along the river corridor within the 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 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)

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


  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?

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 04:32:46 2019