The Environmental Systems Research Institute (ESRI) ArcView project and shapefiles used to create the trackline maps on these discs and a README.rtf file that describes the project in detail can be found in the ARC subfolder of the SOFTWARE folder located at the top level of each disc. The project was created with ESRI GIS software ArcView 3.2 and is compatible with ArcView 3.x (Unix or Windows) and ArcGIS 8.x (Windows). The shapefiles can be viewed using public domain software ArcExplorer 2.0 (Windows) and 4.0 (Windows, Unix, Linux), which can currently be downloaded from the ESRI website at http://www.esri.com/software/arcexplorer.
SEISMIC UNIX SCRIPTS
Seismic Unix (SU) is a public domain seismic processing software package written and maintained by the Center for Wave Phenomena at the Colorado School of Mines in Golden, Colorado. The current web site for SU is http://www.cwp.mines.edu/cwpcodes/index.html. SU is compatible with both Unix and Linux operating systems. The SU scripts provided on these discs were modified from scripts written by the USGS Seafloor Mapping Group in Woods Hole, Massachusetts, and run on a Linux workstation. These SU scripts are located in the Linux tar file chirpll.tar, which can be found in the SU subfolder of the SOFTWARE folder located at the top level of each disc. These scripts are provided as examples only. They may need to be modified to run on another system. They also require the use of shareware programs such as ImageMagick.
The example SU scripts provided here will allow the user to strip off unique navigation fixes from the SEG-Y headers, along with a fix for every 1,000 shots. A second script then strips off channel 1 and converts the seismic data to SU format, where it is gained, and a GIF image of each profile is produced. These images can then be displayed using a variety of shareware programs, such as ImageMagick (Unix, Linux) or a web browser.
Click here for instructions on HOW TO DOWNLOAD THE SEG-Y DATA FILES.
DUMPSEGY.EXE is a DOS seismic data utility that allows the user to examine all the components of the SEG-Y data files (Zihlman, 1992): the EBCDIC and binary headers, the individual data trace headers, and the hexadecimal SEG-Y samples composing a data trace, or their actual floating point values. The DUMPSEGY.TXT file is the original open-file report that gives detailed instructions on how to use DUMPSEGY.EXE. The DSGYNEWS.TXT file describes the upgrades to the original program. All of these files are located in the USGS subfolder of the SOFTWARE folder located at the top level of each disc. Please refer to DUMPSEGY.TXT and DSGYNEWS.TXT for further infomation and instruction.
Zihlman, F.N., 1992, DUMPSEGY V1.0: A program to examine the contents of SEG-Y disk-image seismic data: U.S. Geological Survey Open File 92-590.