DInSAR result scale

I did some work regarding to DInSAR for the two Sentinel-1A produces which are:
I’ve been following the steps as follow: 1. Corregistration (single subswath IW2);
2. Interferogram Formation and Coherence Estimation;
3. TOPS debursting;
4. Topographic phase removal;
5. Goldstein phase filtering;
6. Multilooking [10 (range); 2 (Azimuth)] for filtered phase;
7. Reconstruct the phase after Multilooking by using the Band Maths Op;
8. Range-Doppler Terrain Correction.
I got final phase result with range between (-3.05) to 3.11. I uploaded in the link below:
The result does not have any scale, could you help me to know what is the scale of these numbers? Is it mm or cm!?
Thank you all!

You haven’t unwrapped the phase using snaphu. Have a look at the TOPS InSAR tutorial.

thank you lveci for your tip. However, I am using windows, is there any snaphu for windows?

Have a look at my tutorial

Thanks a lot :slight_smile:

Thank you for your help, I installed the Crgwin64 and SNAPHU successfully. I put the directory of the “C:\cygwin64\bin” to the path of the “Environment Variables”, when I wanted to work with “SNAPHU” it is open and close immediately !

thank you in advance

you run snaphu by opening a new command line window in the respective folder. What happens when you just type snaphu?

I can not write any command line because the sanphu open and immediately close. It looks like flash.
If you have time , can you check that using Team viewer.

open your command window as described here (not by clicking on executables)

and type snaphu.

Thanks a lot, I will check that and contact you ASAP.

Dear ABraun,
I run the command prompt, and I run the snaphu.exe but I could not find the “snaphu.conf.” file

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.

I did that, I open the snaphu.exe, but the snaphu.con did not appear.

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

  1. S1A_IW_SLC__1SDV_20150414T030925_20150414T030952_005474_006FD6_7F63_Orb_Stack
  2. S1A_IW_SLC__1SDV_20150414T030925_20150414T030952_005474_006FD6_7F63_Orb_Stack_ifg
  3. S1A_IW_SLC__1SDV_20150414T030925_20150414T030952_005474_006FD6_7F63_Orb_Stack_ifg_deb
  4. S1A_IW_SLC__1SDV_20150414T030925_20150414T030952_005474_006FD6_7F63_Orb_Stack_ifg_deb_dinsar
  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
  7. S1A_IW_SLC__1SDV_20150414T030925_20150414T030952_005474_006FD6_7F63_Orb_Stack_ifg_deb_dinsar_flt_ML_TC
  8. S1A_IW_SLC__1SDV_20150414T030925_20150414T030952_005474_006FD6_7F63_Orb_Stack_ifg_deb_dinsar_flt_ML_TC.tif

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:


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:

For DInSAR you choose DEFO instead of TOPO, for example.

I got this error