Hello
I am working on subsidence on a coastal system and used S1 imagery from august 2021 to august 2923 at a 6 days time interval. Once downloaded, I followed the steps below:
1 - TopSar Split
2 - Apply an orbit
3 - Coregistration to define the master file
4 - Create a stack
5 - Enhanced Spectral Diversity
6 - Interferogram
7 - TopSAR Deburst
8 - TopoPhase Removal
9 - Multilook
10 - Goldstein filter
11 - Snaphu export
I would like to know how to unwrap the stack. I tried once and only got 1 unwrapped file. I think about modifying the input in the “snap.config” file, what do you think about it ? How to unwrap all phases ?
Thanks for you help
Hi,
You have to unwrap each phase separately and then stack
BTW snaphu export does not work, if you want to patch it and know some python, check my post.
Good luck, I just wrote about a thousand lines of code to manage to get it to run in an OKish way.
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Thanks so much for your response and the script you suggested. Unfortunately I am not too much familiar with python in snap. It might be easier for me to use the GUI
Those 56 slave images are all in one stack where I already applied all the steps mentioned above.
1 - I used Stack Split to break the stack of slaves into each slave, but the intensity file is missing in each splitted product. How to fix that ?
2 - I tried to export the splitted products using SNAPHU EXPORT but it doesn’t work the folder is empty
3 - Once I unwrap them, I directly create the displacement map,but the map is reversed. How to correct it ?
You can try to add +pi to the value of your phases before snaphu export but you need to make the parameters of unwrapping right which takes a lot of time. So I would not do that within a stack
In a coastal area you can try to zero the sea but actually snaphu only really work with a mask that is not generated by esa-snap although the option is present. So except trying to understand my script, there is not much I can offer.