SNAPHU Unwrapping


#61

Agreed with Joseluis, really hoped that someone with experience can help!


#62

Hi all

I have the same problem: Unexpected or abnormal exit of child process… for unwrapping ALOS PALSAR images!!! Help!


#63

@gabrielaquintana77:

did you try this?


#64

Hi ABraun, yes, I did, but It gives the same error :cry:


#65

hmm, what is your intention? Making a DEM or estimating subsidence?
Maybe you can try TOPO / DEFO / SMOOTH (whatever you chose first) or try to change MST / MCF.


#66

Hi again, I want estimates of subsidence! I did this with DEFO and MCF.


#67

Play with tiles until sucseed


#68

Hi, I did with 20-30-40-50-60-70-80-100 and nothing!!! I don’t know what happened!!! :cry:


#69

Hi, if you are using virtual machine to unwrap, you have to increase the ram and disk space. Works for me.


#70

Hi Pancho, I’m not using virtual machine!:confounded :confounded:
I’ve done it for Sentinel!!! but with Palsar I can’t yet.


#71

I’m a Windows user so i’m using Linux in virtual machine to do the snaphu phase unwrapping, and i got the same problem Unexpected or abnormal exit of child process… working with sentinel 1 I just increase the ram and the disk space and it Works. Maybe for Alos palsar could be the same.


#72

Hi all

I did the unwrapped of ALOS PALSAR images, now I will do the calcules to subsidence in an area of interest!

This is the firts result:


#73

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.

I hope that you can help me.

Thanks.


#74

A post was split to a new topic: Acces to InSAR data (Sentinel / Alos)


#75

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

Pasted image1680x1050 140 KB
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.

Thanks.


#76

hei gabriel when you import to snaphu (snaphu import), please tell me what you input in 1-read-phase , mine cant work well. thanks


#77

hei all when you import to snaphu (snaphu import), please tell me what you input in 1-read-phase , mine cant work well. thank


#78

Hi Arbad

The input is the image processed before of the export for SNAPHU


Problem in Snaphu Import section
#79

Hi Gabriel

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 ?

Thanks


#80

Hi Arbad

Yes, after dinsar and filtering. Which is the objetive of your study?