Triton BathyPro - Manual (Page 74)

Smooth Filter
Clicking the Settings… button to this parameter leads to the Smooth Filter
Settings dialog box (Figure 37). The effect of this process is to apply a low
pass filter to the DTM, removing spikes and bumps. If you know that the
area you are surveying really does contain bumps or peaks, you should use
this process with care. Figure 36 shows the dialog box.
Figure 37. Smooth Filter Settings dialog box
You have two entities you can influence here:
• Smoothing Filter Type — The Median filter works in exactly the same way
as the gap-filling filter documented earlier, except that the actual data in
each cell is being adjusted, not the gaps between the data. The Average
filter adjusts the value of each cell to be the average value of the cells within
the selected filter dimension.
• Filter Dimension in pixel unit — same function as the filter dimension Fill
Gaps Filter (see ‘Fill Gaps Filter’).
There are times when you might want to smooth the data
before filling. However, the only way this currently can be
achieved is to first run just the smoothing filter, then run
the gap-filling filter.
June 2004 BathyPro User’s Manual
74