Triton Isis - Manual (Page 40)

June 2004 Isis® Sonar User's Manual, Volume1 26
of the file to the top of the file. This can be done with any XTF, TRA, DAT or
SEG-Y file.
The advantage of playing a file backwards occurs when you want to visually
compare similar data running side-by-side. This is possible only if you are
playing back at least two files in separate Isis sessions (one file per Isis
session).
For example, let’s say a survey line was conducted north to south to record
some side-scan data. Then another survey line was conducted south to
north over the same area. In playback mode, you now can visually compare
the lines by opening two sessions of Isis and simultaneously playing back
the two files — one line playing back in the conventional forward direction,
the other line playing back in reverse. From the perspective of your
computer monitor, both lines will be scrolling down (from top of screen to
bottom of screen), making it possible for you to glance back and forth from
the two sets of images and perhaps spot differences in the lines as the
images scroll.
To play back a file so that it runs backwards (end to start)
1. Run Isis without specifying a file at the same time that you run the
software.
2. From the main menu, choose File →Playback.
Note: The Play icon on the taskbar is reserved for playing back files in
the forward direction. You cannot use the Play icon to play a file
backwards.
The system displays the Disk or Tape playback dialog box (Figure 3-3).
Chapter 3: Using the File Menu