sim3160_readme.txt

DESCRIPTION OF THE DIGITAL DATABASE FOR LIDAR-REVISED 
GEOLOGIC MAP OF THE UNCAS 7.5' QUADRANGLE, CLALLAM AND 
JEFFERSON COUNTIES, WASHINGTON

USGS SCIENTIFIC INVESTIGATIONS MAP 3160


INTRODUCTION

This digital database for the Lidar-Revised Geologic Map of 
the Uncas 7.5' Quadrangle (USGS SIM 3160) includes several 
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 
NAD_1983_StatePlane_Washington_North_FIPS_4601_Feet; 
Lambert_Conformal_Conic 
 
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 two methods of obtaining the 
database, are described below. 


GEOLOGIC CONTENT

This database contains 3 ArcInfo coverages as arc export 
files (.e00) with geologic content: 

uncasgeol                Geologic coverage with arcs, 
                         polygons, and polygon label 
                         points. 

uncastruct               Point coverage of structural data.

uncasfa-xs               Coverage with arcs showing 
                         location of major fold traces and 
                         accompanying points locating map 
                         symbols denoting anticlines and 
                         synclines. Location of 
                         cross-section line A-A'-A''.


BASE MAP CONTENT

Because the lidar DEM does not match the topographic map of 
the Uncas Quadrangle exactly, Tabor and Haugerud digitized 
base elements, streams, water boundaries, and roads from 
the lidar DEM.

The database contains 2 Arcinfo vector coverages  arc as 
export files (.e00)  and one raster (tif) for the base:

uncasdrain               Vector coverage of streams.

uncasroads               Vector coverage of roads with some 
names in the pat.

uncaspolybase.tif        Hillshade relief model of lidar 
                         topography with geologic map  unit 
                         colors.

uncaspolybase.tfw        World file that locates 
                         uncasrelief.tif in State Plane 
                         projection, units meters, datum 
                         NAD83


DIGITAL DATABASE AND METADATA PACKAGE 

(sim3160_database.zip)

The ARC export files as well as the additional 
digital material included in the database package, are 
described below:

File                     Description 
-----------------------------------------------------------

sim3160_readme.txt       This readme file

uncasmetadata-main.txt   Introductory metadata for all 
                         the coverages in this package. 
                         Individual metadata xml files are 
                         in the coverage directories; They 
                         are:

                           uncasstructmd
                           uncasfa-xsmd
                           uncasdrainmd
                           uncasroadsmd
                           uncasgeolmd

geology subdirectory
--------------------
uncasgeol.e00            ArcInfo export file of geology 
                         coverage with arcs, polygons, and 
                         polygon label points. 

uncastruct.e00           ArcInfo export file of structural 
                         data: bedding attiltudes.

uncasfa-xs.e00           ArcInfo export file of major fold 
                         traces and points locating map 
                         symbols denoting anticlines and 
                         synclines and location of cross-
                         section line A-A'-A''.


base subdirectory
-----------------
uncasroads.e00           ArcInfo export file of roads

uncasdrain.e00           ArcInfo export file of drainage

uncaspolybase.tif        Uncompressed TIFF-format hill 
                         shade lidar image with geologic 
                         map unit colors

uncaspolybase.tfw        World file that locates 
                         uncaspolybase.tif in State Plane 
                         projection, units feet, datum 
                         NAD83

Users of the database package may wish to download the 
pamphlet for the contained Description of Map Units. 

The material described above is available on the World-Wide 
Web at http://pubs.usgs.gov/sim/3166/. 


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 were converted to uncompressed ARC export files 
(.e00 extension, ArcInfo version 9.3.1 for Windows XP). 
These export files can be converted into back into 
coverages in ArcInfo with the IMPORT command, for example, 

     Arc: import cover xxx.e00 xxx 

and can 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/3160/

to access the database package and the remainder of this 
publication.


HARD COPY OF SIM3160 is not available


ACKNOWLEDGEMENTS

We thank Karen Wheeler for review of this readme, the 
database package, and associated metadata.