Triton Sidescan - Manual (Page 19)

Page 16
5.1.6 Corrections and Filters
The last page of the sidescan
processing wizard is for correcting
position and gain loss in the mosaic.
 Process Navigation
This section selects the
correct navigation to use for
creating the mosaic, with
three options available:
o
Process Navigation - If
processing is needed and
has not been done, then the top option allows the user to set the navigation
processing parameters.
o
Use Processed Navigation - If processing has already been done, then this
option tells the processing algorithm to look in the cache for the navigation
values to use.
o
Use Raw Navigation (from XTF) - This option is for data where the navigation
does not need to be processed and the values in the XTF files are good to use
for creating the mosaic. Generally this is only true for navigation processed
externally from Perspective and then inserted into the XTF file after it was
processed using scripts in MatLab or using another application.
 Grid Corrections
If there is an existing DTM of the survey area, the topography can be used to
correct the mosaic in two ways:
o
Topography: Applies 'position' corrections by using the changes in elevation
in the DTM.
o
Angle of Incidence: Applies 'amplitude intensity' corrections by accounting
for the angle of incidence between the sidescan beam and the seafloor (still
is development!).