Open-File Report 2000-242
Archive of Datasonics SIS-1000 Chirp Subbottom
Data
Collected During USGS Cruise DIAN 97011
Long Island, NY Inner Shelf -- Fire Island, NY
5-26 May, 1997
U.S. Geological Survey Open-File Report 00-242
by Jenna C. Hill, William C. Schwab, David S. Foster
U.S. Geological Survey, Woods Hole, MA 02543
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 by using a variety of WWW information
browsers (i.e. NCSA Mosaic, Netscape) to facilitate browsing and locating information
and data. 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 selected browser. The HTML documentation is written utilizing some
HTML 4.0 enhancements. The disk should be viewable by all WWW browsers but may
not properly format on some older WWW browsers.
Also, some links to USGS collaborators and other agencies are available on this
CD-ROM. These links are only accessible if access to the Internet is available
during browsing of the CD-ROM.
The archived Chirp subbottom data are in standard Society of
Exploration Geologists (SEG) SEG-Y format (Barry and others,
1975) and may be downloaded for processing with software such as Seismic
Unix or SIOSEIS. The subbottom data
were recorded on the Mudseis data acquisition system in SEG-Y format. The conversion
program processSegy was used to renumber the traces as trace 1 or traces 1 and
2 for 2-channel data and fill out the SEG-Y EBCDIC reel header. The Mudseis
system begins with trace 0 instead of 1. Much of the information needed to process
the data is stored in the SEG-Y headers: a 3200 byte EBCDIC reel header; a 400
byte binary reel header; and a 240 byte trace header for each seismic trace.
DOS and Microsoft Windows compatible software for plotting SEG-Y files (PLOTSEIS)
and viewing SEG-Y headers (DUMPSEGY)
is located in the PLOTSEIS directory. Processed chirp profiles (GIF images)
may be viewed on this CD-ROM with your WWW browser.
In 1995, the USGS Woods Hole Field Center, in Cooperation with
the U.S. Army Corps of Engineers, began a program designed to map the seafloor
offshore of the New York-New Jersey metropolitan area; the most heavily populated,
and one of the most impacted coastal regions of the United States. The ultimate
goal of this program is to provide an overall synthesis of the sea floor environment,
including surficial sediment texture, subsurface geometry, and anthropogenic
impact (e.g. ocean dumping, trawling, channel dredging), through the use and
analysis of sidescan-sonar and subbottom mapping techniques. This regional synthesis
will support a wide range of management decisions and will provide a basis for
further process-oriented investigations.
Directory BIN:
Subdirectory PLOTSEIS:
This directory contains the DOS programs for plotting SEG-Y files and viewing
SEG-Y headers.
Subdirectory SU: Contains the Seismic
Unix scripts used to process and plot the chirp subbottom data and extract
shot navigation from the SEG-Y headers
Directory HTMLDOCS: Contains the necessary
HTML files and supporting graphics to allow the user access to the CD-ROM via
any World Wide Web (WWW) browser.
Directory IMAGES: Contains GIF and JPEG images that are used
by HTML hyperlinks.
Directory MAPS: This directory contains basemap and shot navigation
themes. The data may be displayed with ARCVIEW version 3.1 or above, or ARCEXPLORER.
You may need to copy the directories to disk and edit the .apr file in the PROJECT
subdirectory to reflect the new directory paths.
Directory NAV:
Subdirectory RAWNAV: This directory
contains raw DGPS navigation files as acquired in the field.
Subdirectory SHOTNAV: Contains the shot
navigation data collected during the cruise using a USGS differential GPS
system.
Directory SEGY: Contains the Chirp SEG-Y
format data. These data were collected using a Datasonics SIS-1000 Chirp subbottom
profiler. The SEG-Y data were logged on a Triton-Elics
ISIS acquisition system. The SEG-Y format is documented in HTML.
Directory SEISIMAG: Contains the GIF format files of the Chirp
subbottom profiles generated with Seismic
Unix.
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 these data, software,
or related materials.
Barry, R.M., Cavers, D.A., and Kneale, C.W., 1975, Recommended standards for
digital tape formats, Geophysics, v. 40, p. 344-352
Zihlman, F.N., 1992a, DUMPSEGY V1.0: A program to examine the contents of SEG-Y
disk-image seismic data; U.S. Geological Survey Open File 92-590.
Zihlman, F.N., 1992b, PLOTSEGY V1.0: A DOS graphics program to display SEG-Y
disk-image seismic data; U.S. Geological Survey Open File 92-349A and 92-349B.
U.S. Department of the Interior |
U.S. Geological Survey
