I am new to InSAR and I am trying to create an interferogram in mountainous terrain in Iceland with one year in between using Envisat data. Whatever I do the coherence is really bad. Even in the flat areas. (when I use a shorter timeframe like one month then the flat areas are ok.) I used many different datasets.
Is there anything I can do to improve the coherence? I know that people have used this data before for DInSAR.
as an example I have used the following images:
Am I even using the right imagery or should I use a different Envisat product?
For processing I follow the steps I gathered in the forums here:
- Apply orbit files (Doris Precise)
- Interferogram formation (with external DEM for topographic phase subtraction)
- -here I can already see that the coherence is very low.
- Goldstein phase filter
- snaphu export
- snaphu import
I have spent so many days on trying to work this out and I would be really grateful for any advice.