Hi everyone,
I’m trying to create an interferogram of Lower Austria for my bachelor’s thesis and have been following the NASA tutorial to do so:
After some trial and error, I was able to generate a somewhat promising-looking deformation map. Unfortunately, I later realized it was based on the wrong date pair, so I started over using the correct dates.
I followed the same steps as before:
- Used 4-1 multilooking
- Set the Goldstein filtering parameter to 0.6 (based on a paper suggesting it helps reduce cross-like artifacts)
Then I exported the wrapped interferogram and ran it through SNAPHU with the following parameters:
NTILEROW 5
NTILECOL 5
ROWOVRLP 100
COLOVRLP 100
NPROC 6
TILECOSTTHRESH 500
These are the same settings I used the first time.
However, the result from SNAPHU this time looks very similar to the wrapped interferogram
just with the colors changed. So now I’m unsure:
Was there an error in the SNAPHU unwrapping, or did something go wrong earlier in the processing chain?
I’m still new to interferometry and could really use help from someone with more experience. I’m aware that the area might not show much deformation, as there was no major event at that time except for heavy rainfall, but I want to make sure I’m at least processing things correctly.
This is the wraped Interferogram:
And this the same one unwraped:
I’m also attaching my first interferogram (from the wrong date) in case that helps evaluate whether it was even correct in the first place.
Im using the newest Version of SNAP (11.0) on a Windows PC and the SNAPHU is done on a linux server with 64 gb ram
Thanks in advance! If I need to provide screenshots or files for troubleshooting, just let me know.
Best regards, Oceanman