Problem Topograpic Phase Removal

I already tried to do topography phase removal, but the topo phase seems not right (only purple color). What is the problem and how I supposed to do that?

What area are you working with, what DEM was used, are there DEM tile for that area and is there varying topography in that area?

I used SRTM 30 m. Isn’t it auto download (like terrain correction)? I also tried to use SRTM 30 m external DEM. The result is still same (only show purple colour in topographic phase). Is it because my area interest basicaly covered with vegetation? Because only a little area like bare land area that show good coherention. And I used data with 8 days different acquisition.


Trying to apply topographic phase removal, purple area apears: phase initialise to zero!