USING THIS DATA SET

   The information contained on this CD-ROM may be accessed as ASCII text files or as HyperText Markup Language (HTML), a standard language utilized by the Internet World Wide Web .  Development of the CD-ROM documentation and user interface in HTML allows access the information by a variety of WWW information browsers (i.e. Netscape, Microsoft Internet Explorer) to facilitate browsing and locating information and data. Each CDROM contains a complete set of the HTML pages, image files and navigation data, but only SEG-Y data for 1/3 of the seismic lines. This was done due to large size of the SEG-y files and the limited amount of space on each CDROM.

Downloading a selected file with a browser

   To download a selected data file while using the browsers, select the desired file by placing the system pointer on the file name from the data list and pressing and holding the right mouse button.  This will display a pop-up menu.  The user should drag the mouse to highlight "Save this link as ..."or "Save target as.."and release the mouse button.  the browser will then prompt the user to specify the name and location of where the selected data file should be saved.  Different operating systems and versions of Netscape might work somewhat differently.

CD-ROM Contents
 

Directory htmldocs:
        This directory contains html files and associated image and text files that may be viewed with any HTML v. 2.0 or higher compatible web browser.   A more recent web browser (i.e. Internet Explorer v. 4.0, Netscape v. 4.05 or higher) that is Java enabled may be necessary to view the interactive figures.

Directory images:
           This directory contains all the images that are included ion this CD-ROM. They are divided into three groups:

• Processed seismic lines:  These Jpeg format images show a colorized screen shot of the processed seismic lines.
• Maps and Other Descriptive Images:  Includes Jpeg and GIF images and figures that provide useful information regarding the data collected on this cruise.
• Other Images and Icons:  Jpeg and Gif images and Icons used to make this CD-ROM easier to view and navigate

Directory nav:
            This directory contains 3 sets of files that provide all the navigation information regarding the GYRE 1997 cruise.

• Raw Navigation: Contains the unfiltered raw shipboard navigation data
• Time, Latitude, Longitude: Three column ASCII data containing position information for use with GMT and other mapping tools
• AirGun Shot/Time logs:  Contains information regarding each airgun shot for each line.

Directory seg_y:
                This directory contains the seismic reflection data collected on the GYRE 1997 cruise.  All data are saved in standard SEG-Y format with complete header and processing history information. The data can be downloaded to disk or accessed directly from the CD-ROM.
 

• Raw Data: Complete record of all data collected with no processing
• Processed Data: the longest Raw data file from each line was processed for best output at the USGS. Processing flow history is included for reference.

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