DESCRIPTION OF DIGITAL FILES FOR GEOLOGIC MAP OF THE DES MOINES 7.5' QUADRANGLE, KING COUNTY, WASHINGTON, U.S. GEOLOGICAL SURVEY SCIENTIFIC INVESTIGATIONS MAP 2855 Digital database and cartography by Ralph A. Haugerud, Elizabeth A. Barnett, and Matt D. Anders INTRODUCTION This readme document serves to introduce and describe the digital files that are included in this publication. They are available for downloading at http://pubs.usgs.gov/sim/2004/2855/ and include both Geographic Information System (GIS) software files (both raster and vector data) that are viewable with an Environmental Systems Research Institute (ESRI) compatible commercial GIS (or with ESRI's ArcReader utility; a free map viewer with no editing capabilities) as well as Portable Document Format (PDF) files that are viewable with a reader or web browser plug-in available for free on the internet. Two download packages are available (see the section entitled "Scientific Investigations Map 2855 Digital Contents" below for details) depending on the resources available to the user. For those interested only in a paper plot of the Scientific Investigations Map, please see the section entitled "Obtaining Paper Plots" below. This digital map publication, generated from new and previous mapping by the authors, shows the general distribution of bedrock and surficial deposits in the Des Moines 7.5' quadrangle. It presents current knowledge of the geologic structure and stratigraphy of the area covered. The database identifies map units that are classified by general age and lithology following the stratigraphic nomenclature used by the U.S. Geological Survey. The scale of the source map limits the spatial resolution (scale) of the database to 1:24,000 or smaller. The content and character of the digital publication, as well as methods of obtaining the digital files, are described below. SCIENTIFIC INVESTIGATIONS MAP 2855 DIGITAL CONTENTS The digital data for this Scientific Investigations Map consists of: 1) A Geodatabase package that contains geologic vector and table data stored as data objects within an ESRI ArcGIS 9.0 personal geodatabase, raster data stored as ESRI format DRG-TIFF, an ESRI map document for use with ArcGIS 9.0 which allows full control of editing and rendering of the data sources, an ESRI published map document for use with ArcReader which allows viewing and querying of the source data along with metadata, and an ArcGIS style for symbolizing the map. 2) A Shapefile package that contains shapefiles exported from the personal geodatabase, and the same ESRI DRG-TIFF as in the Geodatabase package along with supporting files including metadata. 3) PDF files of the map sheet. Each package has been compressed into a single file (.zip extension) using WinZip, a freely downloadable compression software utility (download from http://www.winzip.com. Each compressed file will uncompress into a folder containing the associated files. If you: * Have access to ArcGIS 9.0, download the Geodatabase package and open the map document (.mxd extension) from ArcGIS (version 9.0). * Have access to ArcView 3.x, ArcGIS 8.3, or a GIS that can read shapefiles, download the Shapefile package. * Do not have access to a GIS but wish to view and query the data, download the Geodatabase package and open the published map document (.pmf extension) from ArcReader (free download from http://www.esri.com). * Do not have access to a GIS and only wish to print the map sheet or parts of it, download the PDF package and open them from Adobe Reader 5.0 or later (free download from http://www.adobe.com). Note that the map sheet is approximately 35 x 48 inches and will require a large- format plotter. * Only wish to have a paper copy of the Scientific Investigations Map, see the section entitled "Obtaining Paper Plots" below. 1) GEODATABASE PACKAGE: SIM2588_DB.ZIP (12.9 MB compressed, 63.1 MB uncompressed) Geodatabase: des_moines.mdb An ESRI personal geodatabase containing the following: 'geology' Feature Dataset Anno_81_86 The feature-linked annotation file linking dmn_geo_poly_Anno to dmn_geo_poly arc_poly_Topology Topology that includes dmn_geo_poly and dmn_geo_arc. dmn_geo_arc A line feature class representing the contacts and faults of the geology dmn_geo_poly A polygon feature class representing geologic units dmn_geo_poly_Anno An annotation feature class representing feature-linked annotation (labels) for geologic unit polygons (dmn_geo_poly). dmn_geo_traces_arc A line feature class representing bedding traces of geologic units dmn_ocean_poly A polygon feature class used to mask the ocean portion of the Des Moines DRG 'locations' Feature Dataset Anno_81_86 The feature-linked annotation file linking dmn_sam_pt_Anno to dmn_sam_pt dmn_sam_pt A point feature class representing locations of geologic samples dmn_sam_pt_anno An annotation feature class representing feature-linked annotation (labels) for sample locations (dmn_sam_pt) 'structure' Feature Dataset Anno_4_9 The feature-linked annotation file linking dmn_stx_pt_Anno to dmn_stx_pt. dmn_stx_pt A point feature class representing geologic structure point features (bedding attitude) dmn_stx_pt_anno An annotation feature class representing feature-linked annotation (labels) for sample locations (dmn_sam_pt) Map documents and data: des_moines.mxd ArcMap document created in ArcGIS 9.0 containing the data rendering and symbolization information that was used in the production of the Scientific Investigations Map sheet. des_moines.pmf Published map document created from des_moines.mxd for use with ArcReader. It contains all of the same rendering and symbolization information that is in the original .mxd. Features may be queried with the identify tool in the same way they could in the .mxd, but there are no editing capabilities with this utility SGMP15.style Custom style file used to symbolize lines, polygons, and points. For ArcGIS 9.0 put this into "\Program Files\ArcGIS\Bin\Styles"; for ArcGIS 8.3 put this into "\ArcGIS\Bin\Styles" dmn_drg.tif DRG base of USGS topographic map. dmn_drg.tfw World file containing projection information for dmn_drg.tif hs_az45_alt50 A hillshade created from the Des Moines Digital Elevation Model (DEM) with a sun azimuth of 45 degrees, a sun height angle of 50 degrees, and vertical exaggeration of 2 dmn_ocean A raster of the ocean clipped from the DRG and symbolized to make the bathymetry data distinct DesMoinesMetadata.html Metadata for geodatabase created in ArcCatalog for this map DesMoinesMetadata.txt Metadata for geodatabase created in ArcCatalog for this map 2) SHAPEFILE PACKAGE: SIM2588_SHP.ZIP (6.12 MB compressed, 19.5 MB uncompressed) The following shapefiles were created by exporting the feature classes from the geodatabase described above. Note: The annotation feature classes in the geodatabase are not included in the shapefile package due to limitations of ArcGIS 9.0. dmn_geo_arc.shp A line shapefile representing the contacts and faults of the geology dmn_geo_poly.shp A polygon shapefile representing geologic units dmn_geo_traces_arc.shp A line shapefile representing bedding traces of geologic units dmn_ocean_poly.shp A polygon shapefile used to mask the ocean portion of the Des Moines DRG dmn_sam_pt.shp A point shapefile representing locations of geologic samples dmn_stx_pt.shp A point feature class representing geologic structure point features (bedding attitude) Map documents and data: SGMP15.style Custom style file used to symbolize lines, polygons, and points. For ArcGIS 9.0 put this into "\Program Files\ArcGIS\Bin\Styles"; for ArcGIS 8.3 put this into "\ArcGIS\Bin\Styles" dmn_drg.tif DRG base of USGS topographic map. dmn_drg.tfw World file containing projection information for dmn_drg.tif hs_az45_alt50 A hillshade created from the Des Moines Digital Elevation Model (DEM) with a sun azimuth of 45 degrees, a sun height angle of 50 degrees, and vertical exaggeration of 2 dmn_ocean A raster of the ocean clipped from the DRG and symbolized to make the bathymetry data distinct des_moines.pmf Published map document created from des_moines.mxd for use with ArcReader. It contains all of the same rendering and symbolization information that is in the original .mxd. Features may be queried with the identify tool in the same way they could in the .mxd, but there are no editing capabilities with this utility DesMoinesMetadata.html Metadata for geodatabase created in ArcCatalog for this map DesMoinesMetadata.txt Metadata for geodatabase created in ArcCatalog for this map 3) PORTABLE DOCUMENT FORMAT (ADOBE ACROBAT 5.0) FILE (54.1 MB) des_moines_map.pdf A PDF file containing an image of the entire map sheet, exported from Adobe Illustrator 10 OBTAINING THE DIGITAL DATA The digital data for this map can be obtained in two ways: 1) Download from the U.S. Geological Survey Web Site 2) Request a compact disc (CD) of the files. 1) TO OBTAIN THE FILES FROM THE U.S. GEOLOGICAL SURVEY WEB PAGES: The U.S. Geological Survey supports a set of graphical pages on the World Wide Web. Digital publications (including this one) can be accessed via these pages. The location of the main Web page for the entire U.S. Geological Survey is http://www.usgs.gov. The Web server for digital publications is http://pubs.usgs.gov. To access files for this Scientific Investigations Map report, go to http://pubs.usgs.gov/sim/2004/2855/. 2) TO OBTAIN A CD OF THE FILES: A CD of any or all of the digital files described here can be obtained by sending a request and return address to: Karen Wheeler (or Ray Wells) U.S. Geological Survey 345 Middlefield Road, M/S 973 Menlo Park, CA 94025 or by email: kwheeler@usgs.gov or rwells@usgs.gov OBTAINING PAPER PLOTS TO OBTAIN PLOTS FROM A COMMERCIAL VENDOR: First obtain the PDF package via a download or by requesting a CD of the PDF package as described above. Take that package to a commercial vendor with a large- format plotter. Make sure the vendor is capable of reading CDs and PDF files and provide the vendor with a copy of this document. TO OBTAIN PAPER PLOTS FROM THE U.S. GEOLOGICAL SURVEY: The U.S. Geological Survey provides a print on demand service for digital maps such as this report. To obtain plots, contact the U.S. Geological Survey: USGS Information Services Box 25286 Denver Federal Center Denver, CO 80225-0046 (303) 202-4200 1-888-ASK-USGS FAX: (303) 202-USGS e-mail: infoservices@usgs.gov Be sure to include with your request the Scientific Investigations Map number 2855. DIGITAL COMPILATION The Des Moines 7.5' quadrangle geologic map was created in ArcMap 8.3 and upgraded to ArcMap 9.0 prior to publication. A custom script was used to create the subscripts in the geologic unit name, but the rest of the map can be recreated with standard ArcGIS 8.3 or 9.0 tools. The datasets were symbolized by matching them to SGMP15.style. The map projection is UTM, NAD27, zone 10, meters, and the scale is 1:24,000. The order of the datasets in the ArcMap table of contents was as follows: 1) arc_poly_Topology 2) dmn_geo_poly_Anno 3) dmn_sam_pt_Anno 4) dmn_stx_pt_Anno 5) dmn_stx_pt 6) dmn_sam_pt 7) dmn_geo_arc 8) dmn_geo_traces_arc 9) dmn_geo_poly (matched to style with UNIT_PRNT field) 10) dmn_ocean (all indexed colors except 0 and 1 turned null) 11) dmn_ocean_poly (masks the ocean portion of the Des Moines DRG) 12) dmn_drg.tif (40% transparency; indexed colors 1, 5, 8, 10, 11, and 12 turned null) 13) hs_az45_alt50 (80% transparency) 14) dmn_geo_poly The map was exported from the layout view in ArcMap as an Adobe Illustrator file. A digital layout (or map collar) consisting of a description of map units, correlation of map units, a data table, and geologic summary was created in Adobe Illustrator. Differences between the map as it appears in the Illustrator layout versus in the .mxd or .pmf files represent changes in symbology only and do not reflect any changes in the actual source data. BASE MAP The base map for the digital compilation is a Digital Raster Graphic (DRG) of the U.S. Geological Survey, 1:24,000-scale topographic map of the Des Moines 7.5' quadrangle (1949, revised 1995), which has a 25-foot contour interval on land and a 2-meter bathymetric contour interval. The image inside the map neatline is georeferenced to the NAD 27 Universal Transverse Mercator projection. The horizontal positional accuracy and datum of the DRG matches the accuracy and datum of the source map. The base map layer is a digital image, but no information other than location is attached to the lines. This base map is provided for reference only. The hillshade for the digital compilation was created from a U.S. Geological Survey 10-meter Digital Elevation Model (DEM) of the Des Moines 7.5' quadrangle (1995). The DEM and resulting hillshade are georeferenced to the NAD 27 Universal Transverse Mercator projection. The vertical accuracy of DEM data depends on the source and resolution of the data samples, and is probably is 7 meters, but may be as much as 15 meters. The hillshade was created with a sun azimuth of 45 degrees, a sun height angle of 50 degrees, and vertical exaggeration of 2. SPATIAL RESOLUTION 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 at 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. ACKNOWLEDGMENTS We thank Karen Wheeler for a digital review of this database.