FILE: readme.txt U.S. GEOLOGICAL SURVEY Open-File Report 99-396 BATHYMETRY, SIDESCAN SONAR IMAGE, SURFACE SEDIMENTS, AND SURFICIAL GEOLOGICAL MAP OF THE INNER SHELF OFF SARASOTA, FLORIDA; Preliminary discussion and GIS database release By David C. Twichell US Geological Survey Woods Hole, MA 02543 Valerie Paskevich US Geological Survey Woods Hole, MA 02543 INTRODUCTION This CD-ROM (Compact Disc-Read Only Memory) has been produced in accordance with the ISO 9660 CD-ROM Standard and is therefore capable of being read on any computing platform that has appropriate CD-ROM driver software installed. Access to the data and information contained on this CD-ROM was developed using the HyperText Markup Language (HTML) utilized by the World Wide Web (WWW) project. Development of the CD-ROM documentation and user interface in HTML allows a user to access the information using WWW information browsers (e.g., Microsoft Internet Explorer, Netscape). To access the information contained on this disk with a WWW client browser, open the file 'index.htm' at the top level directory of this CD-ROM with your browser. The HTML documentation is written utilizing some HTML 3.0 enhancements. The disk should be viewable by all WWW browsers but may not properly format on some older browsers. Also, there are some links to USGS collaborators and USGS websites on this CD-ROM. These links are only accessible if access to the Internet is available during browsing of the CD-ROM, and if those linked sites are operating. ********************************************** BACKGROUND A sidescan sonar, bathymetric, and high-resolution seismic-reflection survey was conducted off Sarasota, Florida to describe the relationship between the sediments and morphology of the inner shelf and adjacent shoreface. This CD-ROM contains copies of the completed sidescan sonar mosaic, bathymetric image, collected samples and interpretive geologic overlays. There are two main directories on this CD-ROM. These directories include: 1. Directory htmldocs This directory contains the HTML files and supporting graphics to allow the user access to the CD-ROM via any World Wide Web browser. 2. Directory data This directory contains 10 additional sub-directories with the various data layers. The major data layers are organized in separate directories and are described as: arcview/ - various GIS vector overlays stored in ESRI ArcView shapefiles format ascii/ - contour lines and sample information stored in simple ASCII format for those who cannot access the various ESRI data formats contours/ - this directory contains 2 additional sub-directories that contain the derived bathymetric contours. The directories are named according to the contour interval, and the data are stored as ARC/INFO arc (aat) files. halfm/ - half meter contours onemeter/ - one meter contours geolmap/ - this directory contains 7 additional sub-directories which contain the geologic interpretive overlays. The directories are named (within ISO 9660 contraints) according to the geologic interpretive overlay, and the data are stored as ARC/INFO polygon (pat) files. lowback/ - lowback scatter derived from the sidescan sonar mosaic miocene/ - outcrop of Miocene strata on seafloor rdgcrest/ - Ridge crests shellhsh/ - Holocene shell hash silisand/ - Holocene siliclastic sand sinkhole/ - Sink hole distribution yhdrgrnd/ - young hardground imagery/ - this directory contains 1 additional sub-directory. The main directory contains four image files. The images are stored in geotiff format and may be read by any software capable of handling TIFF files. Associated with each of the image files are world files (*.tfw). The one subdirectory (georep/) contains georeferencing information for each of the image files contained in the imagery directory. import/ - this directory contains the various ARC/INFO coverages in the ESRI ARC/INFO import (*.e00) format metadata/ - this directory contains the metadata for the the various data layers samples/ - this directory contains the sample collected during the field work. The information is stored as ARC/INFO point (pat) information with associated attribute information derived from post-cruise analysis. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Software Requirements This CD-ROM (Compact Disc-Read Only Memory) has been produced in accordance with the ISO 9660 CD-ROM Standard and is therefore capable of being read on any computing platform that has appropriate CD-ROM driver software installed. No specific software is required to access this CD-ROM, nor is any software provided as part of the CD-ROM. The HTML documentation is written utilizing some HTML 3.0 enhancements. The disk should be viewable by all WWW browsers but may not properly format on some older WWW browsers. To view the entire contents of the disk, the user's browser should be JAVA enabled, but it is not required to simply browse the disk's contents. For those people who wish to access the disk and do not have a World Wide Web browser available, they may do so by accessing the disk via their computer's operating system. The data coverages and imagery archived on this disk are intended to be used in Geographic Information Systems (GIS). Most notably for the data coverages (bathymetry contours, samples and geologic interpretive overlays) the GIS of choice has been ESRI's ARC/INFO and ArcView, and the data has been stored in various formats supported by these software packages. As for the raster imagery of the study area, the images are stored in geotiff format. These images may be read by any program capable of reading the TIFF format. Although some programs do not interpret the additional geotiff tags, the image may still be viewed. For those software packages that do not process the geotiff tags properly and where the user wishes to georeference the images, a separate georeference report, which contains the necessary information, is available for each image. ********************************************** ************************************ DISCLAIMER This Compact Disc-Read Only Memory (CD-ROM) publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data published on this CD-ROM have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials.