Open-File Report 97-745 F

SAN FRANCISCO BAY REGION LANDSLIDE FOLIO PART F -

PRELIMINARY MAPS SHOWING RAINFALL THRESHOLDS FOR DEBRIS-FLOW ACTIVITY, SAN FRANCISCO BAY REGION, CALIFORNIA

By: R.C. Wilson and A.S. Jayko

DATA

Digital databases are available for GIS users in ARC/INFO vector COVERAGE format or raster GRID format. The database type is listed below. Those who download digital data should also download the descriptive pamphlet.

The data have been archived as UNIX tar files (for GRIDS) or uncompressed Arc/Info export files (for COVERAGES), then compressed with gzip. Details of tar, gzip and GIS formats as well as links to public-domain software utilities are available on the formats page. File sizes (in parentheses) are for the gzip-compressed download file, followed by the size of the file when uncompressed.

Rainfall threshold map databases are GRIDS. To download the map data, select one of the following:

• 6-hour rainfall threshold (10.8 MB, 29.8 MB) sfbr-rt6.tar.gz
• 24-hour rainfall threshold (10.7 MB, 28.3 MB) sfbr-rt24.tar.gz

Rain-gage and Alert-station locations and rainfall threshold contour maps are COVERAGES. To download the map data, select one of the following:

• Rain-gage locations (2 kB, 9 kB) sfbr-rtg.e00.gz
• Alert-station locations (7 kB, 79 kB) sfbr-rta.e00.gz
• 6-hour rainfall threshold contours (81 kB, 283 kB) sfbr-rt6c.e00.gz
• 24-hour rainfall threshold contours (173 kB, 440 kB) sfbr-rt24c.e00.gz

Rain-gage and Alert-station locations are also included as text files. To download the text data, select one of the following:

• Rain-gage locations (0.8 kB, 1.4 kB) sfbr-rtg.txt.gz
• Alert-station locations (1 kB, 2.3 kB) sfbr-rta.txt.gz

PLOTFILES

Plotfiles are available for those who wish to produce paper copies of maps prepared from the digital data. These maps have been edited to conform as much as possible to standard U.S. Geological Survey format for geologic maps. The plotfiles are in PostScript format. Note that these plotfiles are formatted to plot on 34 by 34 inch or larger sheets, so a large format color plotter is required to produce a paper map. Alternatively, some software can import PostScript files, allowing the user to manipulate the map image as desired. Those who download plotfiles should also download the descriptive pamphlet.

The data have been compressed with gzip. Details of gzip and GIS formats as well as links to public-domain software utilities are available on the formats page. File sizes (in parentheses) are for the gzip-compressed download file, followed by the size of the file when uncompressed.

To download the plotfile, select one of the following:

• Map of 6-hour rainfall thresholds (1.1 MB pdf file) sfbr-rt6.pdf
• Map of 6-hour rainfall thresholds (2.7 MB, 41.1 MB) sfbr-rt6.ps.gz
• Map of 24-hour rainfall thresholds (2.9 MB, 41.1 MB) sfbr-rt24.ps.gz
• Map of 24-hour rainfall thresholds (PDF file) (21 MB) sfbr-rt24.pdf

PAMPHLET

A descriptive pamphlet is provided, available either as a PDF, a formated PostScript file, formatted for printing on standard 8.5 by 11 inch paper, and as an unformatted text only file. The pamphlet describes the content and character of the database, including details of database structure, and the map, including how the map was produced. This pamphlet contains information important for all those using this report.

To view the pamphlet, select one of the following:

• Descriptive pamphlet text only (41 kB) sfbr-rt-dbdesc.txt
• Descriptive pamphlet PostScript (1.1 MB) sfbr-rt-dbdesc.ps
• Descriptive pamphlet PDF file (128 kB) sfbr-rt-dbdesc.pdf

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