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Landslide Incidence and Susceptibility in the Conterminous United States

Landslide Incidence and Susceptibility in the Conterminous United States

Metadata also available as - [Outline] - [Parseable text] - [XML] - [DIF]

Frequently-anticipated questions:


What does this data set describe?

Title:
Landslide Incidence and Susceptibility in the Conterminous United States
Abstract:
These data are a digital version of U.S. Geological Survey Professional Paper 1183, Landslide Overview Map of the Conterminous United States. The map and digital data delineate areas in the conterminous United States where large numbers of landslides have occurred and areas which are susceptible to landsliding. Because the data are highly generalized, owing to the small scale and the scarcity of precise landslide information for much of the country, they are unsuitable for local planning or actual site selection. This National Atlas map layer was previously distributed as Digital Representation of the Landslide Overview Map of the Conterminous United States.
Supplemental_Information:
The purpose of this map layer is to give the user a general indication of areas that may be susceptible to landsliding. It is not suitable for local planning or site selection.

More information on the USGS National Landslides Hazards Program is available at <http://landslides.usgs.gov/>.

  1. How should this data set be cited?

    Godt, Jonathan W. , 200102, Landslide Incidence and Susceptibility in the Conterminous United States: U.S. Geological Survey Open-File Report 97-289, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    These data were originally published as: Godt, J.W., 1997, Digital Representation of Landslide Overview Map of the Conterminous United States: U.S. Geological Survey Open-File Report 97-289, scale 1:4,000,000. Available online at <http://landslides.usgs.gov/learningeducation/nationalmap/index.php>.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -125
    East_Bounding_Coordinate: -66
    North_Bounding_Coordinate: 50
    South_Bounding_Coordinate: 24

  3. What does it look like?

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

    Calendar_Date: 2001
    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 (2813)

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

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000278. Longitudes are given to the nearest 0.000278. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is GRS1980.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

  7. How does the data set describe geographic features?

    Landslide susceptibility and incidence polygons (described by lsoverp020.dbf)
    Landslide incidence and susceptibility (Source: U.S. Geological Survey Professional Paper 1183)

    Shape
    The representation of the entity in the data. (Source: U.S. Geological Survey)

    ValueDefinition
    polygon2-dimensional element

    Area
    The size of the shape in coverage units. In the distributed file, coverage units represent square decimal degrees. (Source: National Atlas of the United States)

    Range of values
    Minimum:0.000
    Maximum:618.453

    Perimeter
    The perimeter of the shape in coverage units. In the distributed file, coverage units represent decimal degrees. (Source: National Atlas of the United States)

    Range of values
    Minimum:0.008
    Maximum:1515.642

    Lsoverp020
    Internal feature number. (Source: National Atlas of the United States)

    Range of values
    Minimum:2
    Maximum:2814

    Inc_sus
    A descriptor of landslide incidence and susceptibility. (Source: U.S. Geological Survey)

    ValueDefinition
    combo-hiHigh susceptibility to landsliding and moderate incidence.
    highHigh landslide incidence (more than 15% of the area is involved in landsliding).
    lowLow landslide incidence (less than 1.5 % of the area is involved in landsliding).
    modModerate landslide incidence (1.5 - 15% of the area is involved in landsliding).
    no-dataNo data exist for these areas.
    sus-highHigh susceptibility to landsliding and low incidence.
    sus-modModerate susceptibility to landsliding and low incidence.


Who produced the data set?

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

    • Jonathan W. Godt

  2. Who also contributed to the data set?

    Damon Sather and Jonathan Godt performed the laborious task of integrating the thematic data with the National Atlas coastline data.

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

    Lynn Highland
    U.S. Geological Survey, National Landslide Information Center
    Director
    MS 966 Denver Federal Center Box 25046
    Denver, CO 80225
    USA

    800-654-4966 (voice)
    303-273-8600 (FAX)
    highland@usgs.gov

    Contact_Instructions: e-mail is the preferred method of contact


Why was the data set created?

These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:4,000,000-scale data. No responsibility is assumed by the U.S. Geological Survey in the use of these data.


How was the data set created?

  1. From what previous works were the data drawn?

    LSOVER (source 1 of 2)
    Radbruch-Hall, D.H., Colton, R.B., Davies, W.E., Lucchitta, Ivo, Skipp, B.A., and Varnes, D.J., 1982, Landslide Overview Map of the Conterminous United States: U.S. Geological Survey Professional Paper 1183, U.S. Geological Survey, Washington, DC.

    Type_of_Source_Media: Stable-base material
    Source_Scale_Denominator: 3,750,000
    Source_Contribution: Spatial and attribute information

    Coastlines (source 2 of 2)
    U.S. Geological Survey, 1999, State Boundaries of the United States: U.S. Geological Survey, Reston, VA.

    Type_of_Source_Media: Online
    Source_Scale_Denominator: 2,000,000
    Source_Contribution: Spatial and attribute information

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

    Date: 1997 (process 1 of 4)
    Landslide incidence and susceptibility polygons were digitized from the original stable-base manuscripts at 1:3,750,000 from U.S. Geological Survey Professional Paper 1183.

    Person who carried out this activity:

    Jonathan W. Godt
    U.S. Geological Survey
    MS 966 Denver Federal Center Box 25046
    Denver, CO 80225
    USA

    303-273-8626 (voice)
    303-273-8600 (FAX)
    jgodt@usgs.gov

    Contact_Instructions: e-mail is the preferred method of contact
    Data sources used in this process:
    • LSOVER

    Date: 2000 (process 2 of 4)
    Polygons were closed along the coastline using the National Atlas coastline file. Minor revisions were made to spatial and attribute information in consultation with one of the original authors (D.J. Varnes).

    Data sources used in this process:

    • Coastlines

    Date: 2000 (process 3 of 4)
    Sliver polygons along State lines were eliminated by merging the polygons with the appropriate larger polygon to which they belonged. Adjacent polygons with the same descriptor of landslide incidence and susceptibility (inc_sus) were merged. Interior State lines were deleted and the attribution was checked. A value of 'no-data' was applied to water areas such as Puget Sound and the Great Lakes.

    Date: 2001 (process 4 of 4)
    Alaska, Hawaii, Puerto Rico, and the U.S. Virgin Islands were removed from the file.

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


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

  1. How well have the observations been checked?

    The data are accurate, within visible tolerances, to the original manuscripts.

  2. How accurate are the geographic locations?

    No tests for horizontal accuracy have been performed on this map layer.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    This map layer is an overview of landsliding in the conterminous United States. The data are thematic and general in nature. There is no intention to fully describe the extent of landsliding in the conterminous United States.

  5. How consistent are the relationships among the observations, including topology?

    Digital data were visually inspected and agree with the original manuscripts.


How can someone get a copy of the data set?

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

Access_Constraints: None
Use_Constraints:
None. Acknowledgment of the National Atlas of the United States of America and (or) the U.S. Geological Survey would be appreciated in products derived from these data.

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

    Earth Science Information Center, U.S. Geological Survey
    507 National Center
    Reston, VA 20192

    1-888-ASK-USGS (1-888-275-8747) (voice)

    Contact_Instructions:
    In addition to the address above there are other ESIC offices throughout the country. A full list of these offices is at <http://ask.usgs.gov/esic_index.html>.
  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the U.S. Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the U.S. Geological Survey in the use of these data.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 21-Jun-2006
Metadata author:
Peg Rawson
National Atlas of the United States
12201 Sunrise Valley Dr
Reston, VA 20192

703-648-4183 (voice)
atlasmail@usgs.gov

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



 


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