Interferometry SAR ALOS PALSAR (Topo Phase Removal Failure)

Hi, I am doing Interferometry SAR with ALOS PALSAR data, the location is Merapi Mountain (Indonesia).
Date: 14 Dec 2009 and 17 Dec 2010. I already succeeded in the process until interferogram. but when I did the Topo Phase Removal the results did not come out. Is anyone know why it is?

Coregistration%201 Coregistration%202 Coregistration%203 Coregistration%204


Topo Phase Removal

This is the result of the Topo Phase Removal

I try to open the topo_phase_HH_14Dec2009_17Dec2010, but the result is just blank like the picture below.

Thank You.

Continue and find solution with the following threads please,

Producing interferogram using ALos Palsar

Tutorial of using ALos Palsar

Okay thank you, i’ll try it.