Triton Sidescan - Manual (Page 22)

Page 19
5.3 Other Processing Options
Presented here are a few optional processing tools:
5.3.1 Navigation Processing
The sidescan processing wizard only allows one pass at filtering the navigation. However,
for really bad navigation, either due to faulty equipment or overhead obstructions, this
may not be adequate to get good results from the sidescan data. To launch the
Process
Navigation module, right-click on the Sidescan Navigation file tree node.
5.3.2 Merge Lines
Some sonars or users automatically end their survey lines so they do not grow too large.
For processing, it is often preferred to have the small line segments merged into one line
segment. This can be done before creating a mosaic using the
Merge Line toolbar button.
5.3.3 Move Line
Move line allows lines within a mosaic to be moved relative to each other. This tool is great
for AUV data where there is often a navigation drift over time. Since the position of the
first survey line is generally the most accurate in an AUV survey, the subsequent lines can
be corrected by correlating features seen in the overlap area for both lines. To launch
the
Move Line module, right-click on the sidescan file in the Sidescan Imagery tree node.
5.3.4 Add Lines
After a mosaic is created additional survey lines can be added using this tool. This is very
useful for multiple day surveys. As new lines are completed they can be processed and
added to the existing mosaic while the survey progresses. To launch the
Add Lines tool,
right-click on the sidescan mosaic in the Sidescan Imagery file tree node.
5.3.5 Remove Lines
It is also possible to remove lines from an existing mosaic. This is found by right-clicking
on the sidescan mosaic in the
Sidescan Imagery file tree node.
5.3.6 Single Channel Auto Flip
Found on page two of the mosaic processing wizard, this option will create a mosaic with a
single shadow direction, either port or starboard. It does this by selecting only the port
channel for one direction and only the starboard for the other. To do this there must be
at least 100% overlap between lines.