DESCRIPTION OF DIGITAL FILES FOR SUSCEPTIBILITY TO DEEP-SEATED LANDSLIDING MODELED FOR THE OAKLAND-BERKELEY AREA, NORTHERN CALIFORNIA Edited by R.J. Pike and R.W. Graymer INTRODUCTION The relative hazard for each of several landslide scenarios is presented as a geospatial database. This document describes the types and contents of files comprising the databases. Information on how to extract and plot the report also is provided. This publication includes ARC/INFO (Environmental Systems Research Institute, http://www.esri.com) version 8.1.2 grids and associated tables and four text files of FGDC-compliant metadata for each grid. GEOSPATIAL DATABASE FILES AND ASSOCIATED FILES All files listed in this section are in a compressed tar file named sir2007-5196.tgz; see section below titled, SOFTWARE UTILITIES. When uncompressed and extracted from the tar file, the resulting directory (folder) will contain the following: GRID Contains lgls-grid Arc/Info Grid showing the modeled susceptibility to deep-seated landslides for the Oakland-Berkeley area dfob-grid Arc/Info Grid showing the modeled susceptibility to shallow landsliding for the Oakland-Berkeley area (larger region, less detail) dfop-grid Arc/Info Grid showing the modeled susceptibility to shallow landsliding for the Oakland-Piedmont area (smaller region, more detail) eqls-grid Arc/Info Grid showing the modeled susceptibility to seismic landslides for Oakland, Piedmont, and Berkeley The resulting directory will also include an additional directory: info The info directory is produced in the process of importing interchange files to ARC coverages in ARC/INFO. The info directory contains the following for each grid in the database package: grid.bnd An Info table containing the boundary coordinates for the grid grid.sta An Info table containing statistics, such as mean value, related to each grid grid.vat An Info table containing the susceptibility value for each grid cell (except for dfob-grid and dfop-grid) NOTE: In the table above, the italicized grid represents the name of each grid. Also note, Arc/Info uses arbitrary system names such as "arc0001.nit" for files in Info tables. The actual names can only be seen from within the Info module or another compatible GIS system. Other files: sir2007-5196_readme.txt This document (ASCII text file) FILES FOR VIEWING AND PLOTTING sir2007-5196_plate1.pdf A Portable Document Format (PDF) file for viewing and plotting plate 1 (susceptibility to deep-seated landslides, mapped at regional scale, 1:50,000) at full scale. The plate is approximately 30 x 38 inches in size. sir2007-5196_plate2.pdf A Portable Document Format (PDF) file for viewing and plotting plate 2 (susceptibility to shallow landslides, mapped at regional scale, 1:50,000) at full scale. The plate is approximately 30 x 38 inches in size. sir2007-5196_plate3.pdf A Portable Document Format (PDF) file for viewing and plotting plate 3 (susceptibility to shallow landslides, mapped at detailed scale, 1:24,000) at full scale. The plate is approximately 37 x 44 inches in size. sir2007-5196_plate4.pdf A Portable Document Format (PDF) file for viewing and plotting plate 4 (seismic landslide hazard, mapped at detailed scale, 1:24,000) at full scale. The plate is approximately 38 x 47 inches in size. sir2007-5196.pdf A Portable Document Format (PDF) file for viewing and printing the six-chaptered report that accompanies the plates. METADATA sir2007-5196_plate1_metadata.txt Federal Geographic Data Committee (FGDC) compliant metadata file derived from the digital database for the regional-deep seated landslides grid. sir2007-5196_plate2_metadata.txt Federal Geographic Data Committee (FGDC) compliant metadata file derived from the digital database for the regional shallow landslides grid. sir2007-5196_plate3_metadata.txt Federal Geographic Data Committee (FGDC) compliant metadata file derived from the digital database for the detailed shallow landslides grid. sir2007-5196_plate4_metadata.txt Federal Geographic Data Committee (FGDC) compliant metadata file derived from the digital database for the seismic landslides grid. SOFTWARE UTILITIES Files that have the .gz file extension were compressed using gzip. Gzip utilities are available free of charge via the Internet at the gzip home page, http://www.gzip.org. The data package is additionally bundled into a single tar (tape archive) file. The individual files must be extracted using a tar utility, available free of charge via the Internet through links on the Common Internet File Formats page, http://www.matisse.net/files/formats.html. One such utility is WinZip, available at http://www.winzip.com (WinZip can also decompress files). Another commonly used free utility is Stuffit Expander, available at http://www.stuffit.com. HOW TO OBTAIN THE DIGITAL FILES The digital files constituting the geologic map database of this report may be obtained via the Internet from the U.S. Geological Survey publications website. Go to the web page at http://pubs.usgs.gov/sir/2007/5196/ and follow the directions to download the files. EXTRACTING THE GEOLOGIC MAP DATABASE FROM THE TAR FILE After downloading the files, they must be uncompressed using a gzip utility such as gzip itself or WinZip. The data files must then be extracted using the appropriate tar utility. This process will create a directory, sir5196, that contains the ARC/INFO grid files and supporting files. ARC grid files also can be read by some other Geographic Information Systems. Please consult your GIS documentation to see if you can use ARC interchange files and to determine the procedure for importing them. PORTABLE DOCUMENT FORMAT (PDF) FILES The PDF files are accessed using Adobe Reader software, available at no cost from the Adobe website http://www.adobe.com. Follow instructions at the website to download and install the software. Adobe Reader contains an on-line manual and tutorial.