Triton Sidescan - Manual (Page 16)

Page 13
5.1.3 Select/Order Input Lines
This page allows the user to select
which lines to include in the
processing as shown below. Note
that the line order can also be
specified by right-clicking on a line
and selecting Move Up, Move Down,
or Move to Top.
5.1.4 Geometry Settings
Towfish Configuration: There are
two primary options for vessel
geometry for sidescan processing.
Traditionally, most sidescan sonars
are towed behind the survey vessel
with the layback amount stored on
the raw data file.
Note, if layback has already been
applied to the raw positions in the
XTF file or previously using
Perspective, then applying layback
again here will double the effect!
Also note that Perspective assumes
"layback" includes the towpoint
offsets from the GPS antenna. For
XTF files with 'layback=cable out'
without offsets included, be sure to add the towpoint offsets in both the X & Y directions.
Mounted/AUV Configuration: For AUV surveys and also for pole mounted interferometric
sidescan sonars, it is better to use offsets similar to bathymetry processing to account
for the separation between the sonar and motion reference unit (pitch) & heave sensors.
For manually entering offsets, pay close attention to the drawings for the sign convention
to use for the two options. Note that the Y-direction is positive to stern for towed
systems and positive towards the bow for mounted systems!