USGS Geoscience Data Catalog
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Brabb, Earl E., Roberts, Sebastian, Cotton, William R., Kropp, Alan L., Wright, Robert H., Zinn, Erik N., Mills, Suzanne K., Barnes, Jason B., and Marsolek, Joanna E., 2000, Possible Costs Associated with Investigating and Mitigating Some Geologic Hazards in Rural Parts of San Mateo County, California: U.S. Geological Survey Open-File Report 00-127, U.S. Geological Survey, Menlo Park, CA.Online Links:
This is a Vector and Raster data set. It contains the following vector data types (SDTS terminology):
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 1.0
Ordinates (y-coordinates) are specified to the nearest 1.0
Planar coordinates are specified in METERS
The horizontal datum used is NAD27.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.4.
The flattening of the ellipsoid used is 1/294.98.
Value | Definition |
---|---|
D | Definite landslide deposit |
P | Probable landslide deposit |
UA | Unattributed landslide deposit |
? | Questionable landslide deposit |
Value | Definition |
---|---|
contact, certain | landslide boundary |
map boundary | watershed boundary |
topographic escarpment | landslide escarpment |
Value | Definition |
---|---|
Qol | Old Quaternary landslide deposit |
Qol? | Questionable old Quaternary landslide deposit |
Qyl | Young Quaternary landslide deposit |
Qyl? | Questionable young Quaternary landslide deposit |
Value | Definition |
---|---|
15 | having a slope >= 15% |
Range of values | |
---|---|
Minimum: | 0 |
Maximum: | 7 |
The authors are grateful to Russell Graymer, David Howell, William Lettis, Bruce Clark, John O'Rourke, Betsy Mathieson, Reid Fisher, Roberta Smith, Gerald Weber, Earl Hart, and John Wade who kindly provided excellent comments used to revise various drafts. Suzanne Mills kindly made corrections to the text, figures and database, and made plots of all the maps. Scott Graham helped to revise the Web text.
Note: Authorship of the geology of this publication resides in the first six names in the author list in the order given. Sebastian Roberts is also the primary digital database author. The last three names, starting with Suzanne K. Mills, are the other digital database authors in the order given.
These susceptibility maps and the cost assessment data allow landowners in rural western San Mateo County to determine if their property is impacted by deep-seated landslide and debris flow hazards and, if so, how much money might be required to investigate them. The information is also useful for land use planners, local officials and public interest groups. For example, the maps will be useful for purposes such as determining where sediment from landslides might adversely affect fish in the various creeks, or where roads might be closed after heavy rainfall.
U.S. Geological Survey, 1991, Digital Raster Graphic Topographic Base Map: U.S. Geological Survey, Reston, Virginia.Online Links:
U.S. Geological Survey, 1998, 10 meter Digital Elevation Model: U.S. Geological Survey, Reston, Virginia.Online Links:
U.S. Geological Survey, October 30, 1991, Digital Orthophoto Quadrangle: U.S. Geological Survey, Reston, Virginia.Online Links:
Brabb, E.E., Graymer, R.W., and Jones, D.L., 1998, Palo Alto 30' x 60' Quadrangle, California: a digital database: U.S. Geological Survey, Menlo Park, California.Online Links:
Brabb, E.E., Graymer, R.W., and Jones, D.L., 1998, Geology of the onshore part of San Mateo County, California: A digital database: U.S. Geological Survey, Menlo Park, California.Online Links:
Ellen, S.D., Mark, R.K., Wieczorek, G.F., Wentworth, C.M., Ramsey, D.W., and May, T.E., 1997, Map showing principal debris-flow source areas in the San Francisco Bay region, California: San Francisco Bay Region Landslide Folio, U.S. Geological Survey, Menlo Park, California.Online Links:
Brabb, E. E., and Pampeyan, E.H., 1972, Preliminary Map of Landslides in San Mateo County, California: U.S. Geological Survey, Menlo Park, California.
Pampeyan, E. H., 1994, Geologic map of the Montara Mountain and San Mateo 7.5' quadrangles, San Mateo County, California: U.S. Geological Survey, Menlo Park, California.
Brabb, E. E., Pampeyan, E.H., and Bonilla, M.G., 1972, Landslide Susceptibility in San Mateo County, California: U.S. Geological Survey, Menlo Park, California.
The position of each data item is derived from the USGS topographic base map, and therefore additional inaccuracies arising from inaccuracies in the base map may also be encountered.
The report is intended to be a complete analysis of all previous
landslides through 1963 at a 1:24,000 scale.
Polygon and chain-node topology present
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints:
- Uses of this digital geologic map should not violate the spatial resolution of the data. Although the digital form of the data removes the constraint imposed by the scale of a paper map, the detail and accuracy inherent in map scale are also present in the digital data. The fact that this database was edited for a scale of 1:24,000 means that higher resolution information is not present in the dataset. Plotting at scales larger than 1:24,000 will not yield greater real detail, although it may reveal fine-scale irregularities below the intended resolution of the database. Similarly, where this database is used in combination with other data of higher resolution, the resolution of the combined output will be limited by the lower resolution of these data.
USGS Open-File Report OF-00-127 consists of both traditional geologic map products and Arc/Info format geospatial databases. Furthermore, the traditional geologic map products (map sheets and pamphlets) can be obtained either as paper or as digital plot files.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this publication 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.
Data format: | ARCE (version 7) ARC/INFO export files, PostScript and PDF plotfiles |
---|---|
Network links: |
<http://geopubs.wr.usgs.gov/open-file/of00-127/> |
Media you can order: |
8 mm Exabyte tape
(Density 2.3 or 5.0
GB per tape)
(format TAR file compressed with gzip)
|
Digital files (both plotfiles and database files) can be obtained on-line as described above at the publication web-site, or by sending a request with an 8 mm Exabyte tape (described above) to the Database Coordinator at the address shown above. Be sure to include the name of the digital files you are requesting.
Send a request with an Exabyte tape to the Database Coordinator via the contact information given above. Specify the files requested.
(303) 202-4200 (voice)
(303) 202-4695 (FAX)
infoservices@usgs.gov
USGS Open-File Report OF 00-127 consists of both traditional geologic map products and ARC/INFO format geospatial databases. Furthermore, the traditional geologic map products (map sheets and pamphlets) can be obtained either as paper or as digital plot files.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this publication 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.
Paper copies of the map sheets and pamphlet can be obtained by contacting USGS Information Services via the contact information listed above.
Plotting fees are set by USGS Information Services, and may be obtained by contacting them via the contact information given above.
Paper copies of the map sheets and pamphlet can be obtained by contacting USGS Information Services via the contact information listed above.
650-329-4915 (voice)
skmills@usgs.gov