FILE: readme.txt SIDESCAN SONAR AND NAVIGATION FIELD DATA COLLECTED DURING CAPE HENLOPEN 94-12 CRUISE (24-30 MAY, 1994) U.S. Geological Survey Open-File Report 96-83 by Valerie Paskevich U.S. Geological Survey Woods Hole, MA 02543 David C. Twichell U.S. Geological Survey Woods Hole, MA 02543 Mohsen Badiey College of Marine Studies Univ. of Delaware Newark, DE 19716 Ken Parolski U.S. Geological Survey Woods Hole, MA 02543 William Danforth U.S. 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 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 'intro.htm' at the top level directory of this CD-ROM with your selected 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 WWW browsers. Also, some links to USGS collaborators 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 sidescan data may be downloaded and processed. There is no software available on this CD-ROM for viewing the individual swaths. 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. ********************************************** BACKGROUND This CD-ROM contains copies of the navigation and field sidescan sonar data collected during R/V CAPE HENLOPEN cruise 94-12. The cruise was conducted during 24-30 May, 1994, and was a collaborative field program between researchers at the Univ. of Delaware and the USGS, Marine and Coastal Geology Program, Northeast Section. The sidescan component of this program was conducted at night, and other acoustical experiments were conducted during the day by the group from the Univ. of Delaware. The study area was within the area 39 deg. 26'N - 39 deg. 30'N and 74 deg. 12'W - 74 deg 17'W, and lies on the inner shelf off Little Egg Inlet, NJ in 9-18 m water depth. The purpose of the cruise was to resurvey an area that was initially surveyed in 1991 to see how the sea floor had changed. There are 5 directories on this CDROM: Directory DATA: Contains the collected sidescan data. These data were collected using a Klein 100-kHz sidescan sonar system and were logged on a Triton Technologies, Inc., QMIPS-DSP system. The sidescan sonar data were collected at a resolution of 100 m per side. The sisdescan data collected during the first sidescan survey day is not archived here. Only the port channel of the system was functioning. The area surveyed during day one was resurveyed during day three and the data from day one is not considered useful. The sidescan data are 8-bit binary, and the format is summarized in the writeup in a text file located in the the DOC directory. The data description is also available in HTML format. The archived sidescan data is split and stored on two separate disks. DISK 1: Contains the sidescan imagery for the second day of the sidescan survey portion of the cruise (lines 13-22). DATE/TIME: 1994 5 27 23:16 - - 1994 5 28 8:56 DISK 2: Contains the sidescan imagery for the third day of the sidescan survey portion of the cruise (lines 23-31). DATE/TIME: 1994 5 29 2:24 - - 1994 5 29 10:34 Directory DOC: Contains ASCII documentation on the sidescan sonar file formats collected using QMIPS and QMIPS-DSP. This particular data set was collected with the QMIPS-DSP system. This directory also contains ASCII copies of the cruise report and description of the navigation data file. Directory NAV: Contains the raw navigation that was collected during the sidescan component of the field program with the USGS differential GPS system. The shorebased station for the GPS was the Coast Guard beacon at Cape Henlopen, DE. The navigation is an ASCII file with six fields separated by tabs. Field 1: date and time (julian day:hour (GMT):minute:second) Field 2: Latitude (ie. 39d26.4093) Field 3: Longitude (ie. -74d17.5293) Field 4: Speed (computed from the navigation) Field 5: Heading (computed from the navigation) Field 6: Water Depth (derived from an Odem digital echo sounder). ** Depths are in meters, but have not been corrected for the depth of the transducer, which was about 2 m below the sea surface, nor for the tide. Navigaton fixes are at 10 second intervals, and the file is separated by a # -b into three parts each representing one night of sidescan surveying. During the first night (146:22:29:05 through 147:09:59:20) only the port channel of the sidescan was functional. During the second night (147:22:32:22 through 148:09:04:20) and third night (149:01:48:07 through 149:11:01:00) both channels of the sidescan were working. 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 PLOTS" Contains two subdirectories entitled: locmap and track. These directories contain the MAPGEN control files used to create the track map (track/) and location map (locmap).