can you please show a picture of the topographic phase and the interferogram after topographic phase removal?
If the total deformation is too high according to your expertise in the study area, you can:
- apply multi-looking (e.g. 30 m pixel size) before removing the topographic phase and unwrapping
- apply strongr filtering of the phase
- try SMOOTH as unwrapping method in snaphu instead of DEFO
- use another image pair (descending) of a similar period to see if the pattern persists