San Francisco Bay region landslide folio part D - Index to detailed maps of landslides in the San Francisco Bay region, California

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Frequently anticipated questions:

What does this data set describe?

San Francisco Bay region landslide folio part D - Index to detailed maps of landslides in the San Francisco Bay region, California
A table keyed to 171 topographic quadrangles on a new 1:275,000-scale shaded-relief map speeds access to information on landslide locations in the ten-county San Francisco Bay region. Detailed maps showing individual landslides in nearly any area of interest can be found quickly by knowing only the name of the appropriate 7.5' quadrangle. The some-80 technical reports that contain these maps may be consulted in the U.S. Geological Survey's Menlo Park library collection.
  1. How might this data set be cited?
    Pike, R.J., 1997, San Francisco Bay region landslide folio part D - Index to detailed maps of landslides in the San Francisco Bay region, California: U.S. Geological Survey Open-File Report 97-0745-D.

    Online Links:

    ARC/INFO vector COVERAGE format (<1MB for entire region). Plotfiles in PostScript also available.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -123.678
    East_Bounding_Coordinate: -120.975
    North_Bounding_Coordinate: 38.888
    South_Bounding_Coordinate: 36.85
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1997
    publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: map
  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):
      • Entity point
      • Complete Chain
      • GT-polygon composed of chains
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      UTM_Zone_Number: 10
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -123
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      False_Northing: 0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest unknown
      Ordinates (y-coordinates) are specified to the nearest unknown
      Planar coordinates are specified in meters
      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.
      The flattening of the ellipsoid used is 1/294.98.
  7. How does the data set describe geographic features?
    Quadrangle index map (Source: OFR-97-745-D)
    Name of every 7.5' quadrangle in mapped area (Source: OFR-97-745-D)
    Edges of 7.5' quadrangles (Source: OFR-97-745-D)
    Type of quadrangle boundary (Source: OFR-97-745-E)
    7.57.5' boundary
    1515' boundary
    santa cruzSanta Cruz boundary

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • R.J. Pike
  2. Who also contributed to the data set?
    Earl Brabb and Melanie Moreno contributed to this report. Scott Graham, Carl Wentworth and Gregg Beukelman created the index map.
  3. To whom should users address questions about the data?
    Pike, Richard JJr.
    Mail Stop 975, USGS
    345 Middlefield Road
    Menlo Park, CA

    650-329-4947 (voice)

Why was the data set created?

It is often necessary to find out whether a landslide exists at a particular Bay Area locale. Homeowners, landscape architects, real estate developers, city planners, building officials, emergency-response personnel, civil engineers, utilities workers, and others all have occasion to know where the landslides are. Because existing old and ancient landslides may be reactivated by severe winter storms (Nilsen and others, 1976), timely availability of information on landslide location can reduce losses of life and property to the region's expanding population (San Francisco Bay Landslide Mapping Team, 1997). This report enables visitors to the USGS Menlo Park library to quickly find the detailed landslide map they need. Access to the proper documents is achieved through a table keyed to standard USGS 7.5' quadrangles‹a proxy for a true index map, plus the library location of each document.

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: none
Use_Constraints: none
  1. Who distributes the data set? (Distributor 1 of 1)
    USGS Information Services
    Box 25286, Denver Federal Center
    Denver, Colorado

    1-888-ASK-USGS (voice)
    1-303-202-4695 (FAX)
  2. What's the catalog number I need to order this data set? US Geological Survey Open-File Report 97-0745-D
  3. What legal disclaimers am I supposed to read?
    This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
    This database, identified as "Index to Detailed Maps of Landslides in the San Francisco Bay Region, California," has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 13-Jun-2016
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Collection manager, USGS Geoscience Data Clearinghouse,
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA

703-648-6533 (voice)
703-648-6252 (FAX)
Metadata standard:
Content for Digital Geospatial Metadata (FGDC-STD-001-1998)

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