DESCRIPTION OF THE DIGITAL DATABASE FOR Lidar-Revised Geologic Map of the Poverty Bay 7.5' Quadrangle, King and Pierce Counties, Washington by R.W. Tabor, D.B. Booth, and K.G. Troost, USGS SCIENTIFIC INVESTIGATIONS MAP 3317 INTRODUCTION This digital database for the LIDAR-REVISED GEOLOGIC MAP OF THE POVERTY BAY 7.5’ QUADRANGLE (USGS SIM3317) includes nine ArcInfo coverages (individual vector datasets) along with supporting files and metadata. The coverages have been converted to ArcInfo export files. Relative to coverages, ArcInfo export files are easier to transport from one ArcInfo installation to another and are usable by some other Geographic Information Systems. All GIS data are in STATEPLANE projection, zone 5601, units FEET,SPHEROID, GRS1980 horizontal datum NAD83. Together with the geologic pamphlet, the database provides georeferenced information on the geologic structure and stratigraphy of the area covered. The database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U.S. Geological Survey. The spatial resolution (scale) of the database is 1:24,000 or less. The content and character of the database, as well as how to obtain the database, are described below. GEOLOGIC CONTENT This database contains 4 ArcInfo coverages with geologic content: PVBGEOL Network coverage with arcs, polygons, and polygon label points. PVBSTRSAMP Point coverage of bedding plane strikes and dips with orientation data and dated sample localities PVBED_BLOCK Arc coverage with location of specific beds too thin to show at map scale and trace of slip surface of major block slide PVBDBSTAT Arc coverage of field stations of Derek B. Booth and dated samples and 5 arcinfo coverages with base map content: PVBDRAIN Arc coverage showing digitized streams and rivers PVBRDS Arc coverage of roads PVBHS Arc coverage of hard-surface areas PVBSECT_CB Arc coerage of section lines and county boundary PVB40CON Arc coverage of contours derived from lidar data DIGITAL DATABASE AND METADATA PACKAGE (sim3317_database.zip) The ARC export files and associated ArcInfo coverages, as well as the additional digital material included in the database package, are described below: File Description ------------------------------------------------------------------------------------ PovertybayREADME.txt This readme tile pvbrelief.tif Uncompressed TIFF-format shaded relief image with geologic map unit colors pvbrelief.tfw World file that locates pvbrelief.tif in Stateplane projection, units feet, datum NAD83 pvbgeolgenmd.txt Text-format FGDC-style metadata for the database package as a whole Each coverage within the Geology and Base subdirectories contains detailed XML-format FGDC-style metadata specific to the coverage. This metadata is stored as file metadata.xml within the coverage directory, and is easily browsed from within ArcCatalog, or read with a web browsers (e.g., Firefox, Safari, Internet Explorer) Geology subdirectory -------------------- pvbgeol.e00 ArcInfo export file of geologic contacts and faults pvbstrsamp.e00 ArcInfo export file of bedding strike and dip and dated sample localities pvbed_block.e00 Arcinfo export file of pre-Vashon tills and volcanic ash beds and arcs bounding block slides pvbdbstat.e00 Arc info export file of fieldstations and dated sample localities Base subdirectory ----------------- pvbrds.e00 ArcInfo export file of roads pvbdrain.e00 ArcInfo export file of drainage network pvbhs.e00 Arcinfo export file of hard surfaces pvbsect&cb.e00 Arcinfo export file of section lines and county boundaries pvb40con.e00 Arcinfo export file of lidar derived contours Users of the database package may wish to download the pamphlet (sim3317_pamphlet.pdf for the contained Description of Map Units. The material described above is available on the World-Wide Web at http://pubs.usgs.gov/sim/3317/. ZIP FILES The files described above are packaged within a ZIP file. Utilities to uncompress ZIP files are available for most all operating systems and may be found readily with a simple web search. DIGITAL DATABASE FORMAT The databases in this report were compiled in ArcInfo, a commercial Geographic Information System (Environmental Systems Research Institute, Redlands, California. ArcInfo coverages are converted to uncompressed ARC export files (.e00 extention, ArcInfo version 9.3 for Windows XP). These export files can be converted back into coverages in ArcInfo with the IMPORT command, e.g., Arc: import cover xxx.e00 xxx where xxx is the coverage name. The files can also be read by some other Geographic Information Systems. While specifications for the .e00 format has not been published by Environmental Systems Research Institute, the files are plain ASCII, the structure is relatively easy to decode and 3rd-party descriptions are available via Web search for ".e00 format". OBTAINING THE DIGITAL DATABASE Go to http://pubs.usgs.gov/sim/3317/ to access the database package and the remainder of this publication. ACKNOWLEDGEMENTS We thank Karen Wheeler for review of this readme, the database package, and associated metadata.