Landslide Hazards along River Corridors - Rock fall potential

Metadata also available as - [Outline]

Frequently anticipated questions:

What does this data set describe?

Title: Landslide Hazards along River Corridors - Rock fall potential
Rock fall is a type of landslide that occurs in bedrock where single or multiple rocks are dislodged and fall from steep cliff faces. In a typical alpine setting, cliffs are located on the upper slopes of a mountain with a talus below, extending to the base of the mountain. The talus is composed of rocks that have fallen from the cliff face and accumulate below the cliff. The talus marks the limit of most rock fall from the cliff, but a few boulders that fall from the cliff travel beyond the toe of the talus. It is these outliers that can pose a hazard to adjacent development (see figure "b" below). Rock fall can be triggered by earthquakes, freeze-thaw cycles, or severe weather. Tumbling boulders falling from a cliff face are fast moving and can level virtually anything in their path.
The CONEFALL software program was used to implements this approach in a GIS environment to map areas where rock fall could propagate downslope from a source. As a starting point for the CONEFALL program, cliff-faces were identified to delineate the line representing the base-of-cliff/top-of-talus. Within the study limits, these lines were mapped based on professional judgement using a variety of tools in a GIS environment including vertical orthophotography, oblique photography, and slope mapping. Slopes inclined at more than 200 percent were especially identified.
  1. How should this data set be cited?

    County, King, 20160816, Landslide Hazards along River Corridors - Rock fall potential: King County, King County, WA.

    Online Links:

    Other_Citation_Details: None

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -122.013182
    East_Bounding_Coordinate: -121.293973
    North_Bounding_Coordinate: 47.778567
    South_Bounding_Coordinate: 47.163821

  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):

      • GT-polygon composed of chains (150)

    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 fall potential
    area data table (Source: King County)

    Internal feature number. (Source: Esri)

    Sequential unique whole numbers that are automatically generated.

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

    KC GIS 2015 

    Date Author completed mapping (Source: King County)


    Method to map rock fall potential (Source: King County)

    CONEFALL method 

    Author of mapped shapes (Source: King County)


    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 fall potential 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 04:33:06 2019