normally, when you just enter snaphu, the help message should occur:
So you basically open your command shell in the folder where you exported the SAR data with the SNAPHU export module in SNAP. A file snaphu.conf is created in this step.
As you see, the UnwPhase_ifg… file is only available as a header file, the corresponding raster will be written when running snaphu.
This directory is where you run snaphu as suggested in the file, e.g.
Did you run Radar > Interferometric > Unwrapping > SNAPHU export already?
snaphu.conf is created in this step.
Choose an output folder different than where your other data is stored (e.g. \export) so you don’t mix them up
No, I did not, but which file should I export
I have the following files
one of them:
5. S1A_IW_SLC__1SDV_20150414T030925_20150414T030952_005474_006FD6_7F63_Orb_Stack_ifg_deb_dinsar_flt
6. S1A_IW_SLC__1SDV_20150414T030925_20150414T030952_005474_006FD6_7F63_Orb_Stack_ifg_deb_dinsar_flt_ML
Try the multi-looked one first because it is smaller. If everything works, you can use the other as well.
After Terrain Correction, interferometric information is lost so you apply that at the very end to your DInSAR result.
I’d recommend to read some of the basics so you understand what you need to apply and in which context:
http://omiv2.u-strasbg.fr/imagemining/documents/IMAGEMINING-Doubre.pdf
Thank you a lot, I can not select target folder, I do not why, I select the folder, which the data on it put it is open and did not selected. Moreover, what is the statistical-cost mod? and what is the initial method?
I will read the files you provide me, and I will contact you again.
this is a bug - just copy the path into the mask, this will work
about the parameters - please have a look at the SNAPHU manual:
https://web.stanford.edu/group/radar/softwareandlinks/sw/snaphu/snaphu_man1.html
For DInSAR you choose DEFO instead of TOPO, for example.
because you selected the Terrain Corrected data set. I explained above why this makes no sense, so please have a look at DInSAR work flows instead of randomly clicking buttons.
It is explained until the filtering here:
http://sentinel1.s3.amazonaws.com/docs/S1TBX%20TOPSAR%20Interferometry%20with%20Sentinel-1%20Tutorial.pdf
The next step is the SNAPHU export.
Thank you for your efforts
Sorry if this sounded harsh, we like to help. Especially for beginners SAR can be tricky, but it requires a bit of background knowledge before application.
You are right, I will read what you provide me and I will come soon.
Thanks again
Dear ABraun,
After I read some of the documents you provided it. I tried to apply the unwarpping. I used the multi-looked. I started with run the Radar > Interferometric > Unwrapping > SNAPHU > snaphu export. I copied the path into the target folder, I got this error (NodeID: SnaphuExport] null. Do you have an idea how I can pass this problem?
Thank you in advance
unfortunately not. Can you make screenshots of what you used in each tab in the export module?
why is there only one band phase?
Ususally, there are Phase_xxx and coherehce. I think the naming and composition of the bands shouldn’t be changed.
Yes, you are right. When I used “S1A_IW_SLC__1SDV_20150414T030925_20150414T030952_005474_006FD6_7F63_Orb_Stack_ifg_deb_dinsar_flt” the exporting is worked.
I will check why I got only Phase_XX, without coherence in the multilook file.
Thank you for your tip.
Regards
hi Arsalan, do you know why after multilooking, we just have i and q, without coherence and phase?
Thank You
