Deformation in Volcano with InSAR

Hi!

I’m working with Sentinel-1 data with the goal of determinate deformation in Turrialba Volcano, in Costa Rica. In the last months, the volcano has had an important eruptive activity and I want to determinate the deformation related with this activity.

In my the very first processing, I used the next images:

S1A_IW_SLC__1SSV_20160801T112228_20160801T112255_012406_0135B4_8F2F.zip

S1A_IW_SLC__1SSV_20160825T112229_20160825T112256_012756_014161_B925.zip

I made the processing in SNAP for Windows and the unwrapping with Snaphu in Ubuntu.

I made the processing with the next steps:

  1. Import the images
  2. Co-registration: here I selected IW2 and the bursts 3 and 4
    3.Create the interferogram
  3. Made the deburst
  4. Remove the topographical phase
  5. Applied the Goldstein Phase Filtering
  6. Unwrapping
  7. Geocode

I obtained the following results, after the unwrapping and Geocode:

I don’t think this results can be useful to my goal.

¿Are the steps that I made correct?

¿Why the unwrapping results as I show in the last figure?

I really appreciate any help

Regards

Hi,

I’d like to offer you the following steps, In the same time I’d like to ask you about the track of the two images? Also I’d like to to ask you the following question, Why you didn’t choose SM instead of IW?

co reg…(the out put should be deramp and dmod)…> s-1 range shift
…> s-1 azimuth shift…>deburst…>subset…>infgram
formation …> Topographic removal …>Filtering Goldstein …>
Unwrapping

---------------------------à------------------------à

radar
---------->interferometric ---------->products-------->phase to height
or phase to displacement

the right
file, which should be this one the hdr file
UnwPhase_ifg_srd__***********.snaphu.hdr

Hi @falahfakhri

Thank you for your answer. Well, I used IW instead SM because when I made the search for images, I think there isn’t images in that mode. I used images only for august. I think I can expand the search and try with images in SM mode.

Thank you for the recommendation. I’ll apply.

Regards

Dear friend
As I am using ….i did all of steps like you except 6.unwraping and 7. Geocode.

  1. Import the images
  2. Co-registration: here I selected IW2 and the bursts 3 and 4
    3.Create the interferogram
  3. Made the deburst
  4. Remove the topographical phase
  5. Applied the Goldstein Phase Filtering
  6. Unwrapping
  7. Geocode
    I think they should be like that:
    Unwrapping: Radar……>interfrometric….>unwraping……>snaphu export or inport
    Geocode: Rarad….>Geometric……>Terrain correction……>Range doppler terrain correctin.
    Am I right?
    Cheers,
    Marjan

Hi @marjanmarbouti

I’ve done the next steps:

  1. Import the images
  2. Co-registration: here I selected IW2 and the bursts 3 and 4
    3.Create the interferogram
  3. Made the deburst
  4. Remove the topographical phase
  5. Applied the Goldstein Phase Filtering
  6. Unwrapping: Radar - interferometric - unwrapping - snaphu export
  7. Make the unwrapping in SNAPHU
  8. Unwrapping: Radar - interferometric - unwrapping - snaphu import
  9. Radar - Geometric - Terrain correction - Range doppler terrain correction

Cheers

Jose

Thanks Joe:slight_smile:

1 Like

Hi @fvalverdeuna I did the same steps (plus before terrain correction I did phase to displacement) did you get any results? I’m trying to calculate the displacement of a landslide with 2 S1 IW SLC, and in the area of interest I can not notice any results or displacement. Finally I have a product with just one band: DISPLACEMENT VH, even if I worked with the VV band. Someone could tell me why?

I really appreciate any help
Regards

This is my result: