Hi Shubham, I’m new in this forum. I read that you resolved the problem, could you explain me what’s the problem with the snaphu data import message “3-SnaphuImport: java.lang.NullPointerException”? I have 2 images S1 and I have used S1 TOPS Coregistration, Interferogram formation, Golstein phase filtering, S-1 TOPS Deburst, Snaphu export, and when I try to import the data into NEST DAT 5.1 appear that message.
Hola Jose Luis, yo tambien soy de Colombia y estoy probando con S1 y SNAP, sin embargo tengo problemas para realizar el UNWRAPPING, exporto los datos y trato de seguir el proceso para ejecutarlo en CYGWIN pero no obtengo resultados. Podrias darme una mano con este problema?
I try to arrive to the step “phase to displacement”, therefore I followed S1 TOPS coregistration -> interferogram formation -> S-1 TOPS Deburst -> Topographic phase removal -> Goldstein phase filtering -> SNAPHU export, after, I try to run into cygwin with the following steps: copy the exported files (not folder) to bin folder of SNAPHU-> Open snaphu.conf file -> Run Cygwin as admin -> navigate to bin folder -> Type and execute the command in the conf file, however when I try to execute cywin only appear
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I don’t know if I’m doing something wrong, I hope that you can help me, I only have two weeks to use the computer of the laboratory.
Thankyou for your reply and information, so its mean processed after dinsar and filtering right ? I used ALOS Palsar data but the coherence seem to be like noisy, I cant see anything, have you recommendation ?
I will see deformation in volcano area, so I used Snap for processing PALSAR images, and did same way with the tutorial given. but the result is not so good. what do you think about this problem.
before unwrapping i need some noise correction…I tried it with band math:
i need to compute the coherence map coh(coh<0.4)=0
also
to reduce the noise, after goldstein filtering in the PhaseBand:
coh * Phase_ifg_srd__15Nov2015_23Aug2015
The problem is, this creates two new bands, which will not be processed by the SNAPHU export option of SNAP, so how can I fit this new bands into SNAPHU?
Because obviously I don’t find a way to just edit/make changes on the actual coh and phase bands.
Dear osvaldoguax, how can I check coherence value in Sentinel 1 Toolbox or SNAP? I have experience with GAMMA and it is very easy to use but I still have trouble using Sentinel 1 Toolbox or SNAP. Could you enlighten me?