Masking low coherence areas before unwrapping


#1

Hi

I am trying to create a clean displacement map but i can’t seem to find a way to weed out low coherence areas. I understand we can use the coherence raster to create a binary mask, but don’t know how to go about it. In the video demonstration of the subsidence mapping this part has been skipped.
Any help please!

Amit


#2

Dear @amit
Right click on your displacment map and select band math then edit expression and put this:
Displacment (coherence >= 0.4)


#3

Dear @mzohary , that worked like a charm! Didn’t expect it to be that simple. Thanks!


#4

Your Welcome. Also selecting a higher rate of Multi look would leads to better coherency but you will lose resolution.