I am using Sentinel-1 TOPS SAR data for Himalayan Glacier. i have used Sentinel-1 Tool Box for interferogram generation. there is no step for phase unwrapping. SNAPU is the only way to unwrap the phase. but i could not understand how to unwrap using SNAPU.
Please tell me the phase unwrapping method for Sentinel-1 datasets.
for Sentinel-1 TOPSAR the steps are .... RADAR----------->Unwrapping----->Export and then go to linux because SNAPHU works under linux and open your share folder includes (EXPORT UNWRAPPING) open SNAPHU.CONF and copy the script and paste it in the terminal and press Enter.....Then after this process go to Unwrapping----->Import and import the ....image file. for more information please visit
http://step.esa.int/main/doc/tutorials/snap-tutorials/
Hi Falah,
I am trying to do that but I fail when running SNAPHU.CONF (in Ubuntu VMware virtual machine). I get the following error message:
snaphu v1.4.2
27 parameters input from file snaphu.conf (84 lines total)
extra data in file Phase_ifg_VV_27Feb2015_15Feb2015.snaphu.img (bad linelength?)
Have you got any idea on how to solve it? Or anyone doing interferometry??
And, I do not know what does it mean the last number added to the command line, eg.: snaphu -f snaphu.conf Phase_ifg_VV_27Feb2015_15Feb2015.snaphu.img 8641
Thanks,
Ailin
@ Ailin Sol Ortone Lois
you are getting this error because the width of your exported image has more columns than you are specifying through the command. The last number at the end of command is basically the count of columns in your exported image. you can check check in SNAP how many columns do you have and then specify that number at the end of command line, after this correction the unwrapping should work fine
Good luck
Waqas
How i can generate interferrometric phase from two images using sentinel 1 data
You can do this by coregistering the two Sentinel-1 images, in SNAP it is Radar > Coregistration > S1 TOPS coregistration > S1 TOPS coregistration, after coregistring the two images you can then generate the interferogram as Radar > Interferometric > Product > interferogram formation. This last product is the interferometric phase you are asking about.
Hello. I'm having trouble unwrapping it. If you can get started with the educational film.
You can implement phase unwrapping using SNAPHU for your interferograms generated from Sentinel-1 TOPS SAR data. SNAPHU can be installed as a third-party plugin in SNAP (https://step.esa.int/main/third-party-plugins-2/snaphu/) or compiled from source (the source distribution is found at https://web.stanford.edu/group/radar/softwareandlinks/sw/snaphu/).
Rasool Ebrahimi , you can install the Windows Subsystem for Linux(WSL) & unwrap the phase there. The installation is simple. Just search for it & there's a documentation from Microsoft support center which will guide you through the process. After that you can navigate to the directory where you've exported the data (the navigation requires the use of '/mnt' command e.g.- cd /mnt/c/users/....) & then execute the unwrapping command.
I've attached a screenshot of the same process.
Hope this helps .
P.S.- The unwrapping in windows is also possible by installing the SNAPHU plugin in SNAP, but it's a bit time consuming than ubuntu.
Instead of using Terminal, GUI of SNAP software is easier to use.
After running Goldstein phase filter, use snaphu export and save the data in a new folder. Then use SNAPHU command on that very folder. After completion of SNAPHU command, again use snaphu import to import the image back in SNAP window.
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