Land displacement and subsidence analysis of SENTINEL 1 data

s1tbx
#1

hi everyone

I’m interested to do the process of land subsidence and displacement analysis using SENTINEL 1 data.which type of data( like which modes,polarization,sensing mode) can be use to execute the process and how the process can be do for the analysis

many thanks in advance.

#2

you need SLC products for this, one polarization (preferably VV) is sufficient.

The steps to generate an interferogram are described in this tutorial: http://step.esa.int/docs/tutorials/S1TBX%20TOPSAR%20Interferometry%20with%20Sentinel-1%20Tutorial.pdf

To convert it to absolute phase changes, the interferogram must be unwrapped.
Unwrapping itself is demonstrated here: SNAPHU Unwrapping
Then you import the unwrapped phase back into SNAP (described here: Problem in Snaphu Import section)
Lastly, you perform “phase to displacement” to get the change along the line of sight.

#3

Thank you for the comprehensive reply. I have greatly benefited from it.

But I need to take some steps further, which I am not very clear with at the moment. I want to monitor subsidence for over a period of 4 years. Please, what further steps can I take to achieve this goal.

Many thanks.

#4

Have you seen this topic? Subsidence map in 3d view

#5

Yes! But to my understanding there was place where interferogram stacking, or historical subsidence monitoring techniques was mentioned. I look forward to further supports.

Beat regards.

#6

a suggestion on how to combine the deformations of several image pairs is made in this tutorial:

https://eo-college.org/resources/insar_deformation/

But note that this was created using NEST and some of the steps (unwrapping, phase to deformation) are now easier to achieve.