Triton Isis - Manual (Page 208)

June 2004 Isis® Sonar User's Manual, Volume1 194
Table 9-4. Options for Beam Angle Compensation
Collect Statistics,
Correct Image, and
Off These are the same for full level as they are for middle level
(see
‘Working at the Middle Level of Compensation’
on page 191).
Compensation Choose between Beam Pattern (Beam Angle) and Grazing
Angle compensations.
Across-Track Slope In order to calculate accurate beam angle and grazing angle
compensations, the across-track slope must be specified.
Zero slope is at the center of the slide bar. The direction of
the arrows on the slide bar indicates the up direction. The
distance from the center corresponds to the size of the slope
angle.
Gain Adjust Use the Gain Adjust box to adjust the relative gain of port
and starboard channels. You can do this manually or let Isis
do it automatically. Any adjustment is incorporated into the
BAC.
8. Automatic: The relative average intensity of any pair of
port and starboard channels is tracked for beam
angle compensation statistics. When the BAC is
calculated, any necessary gain adjustment is
included in the compensation.
9. Manual: Move the slide bar to the right to increase gain
or to the left decrease gain of either the port or
starboard channel. Any gain adjustment that is set at
the time that the beam angle compensation is
calculated is incorporated into that compensation.
Save Corrections Once a beam angle or grazing angle compensation has been
calculated, the compensation can be saved in a BAC or GAC
file for later use in VISTA or with another imagery data file.
Use the Save Compensations button for this purpose.
Load Corrections If you wish to use a stored beam pattern file or previously
calculated BAC or GAC, the path and name of that file can
be specified using the Load Compensations button.
Chapter 9: Using the Tools Menu