Interferogram Formation - Subtract topographic phase check box

I can tell you the steps but you will have to read a bit to understand what is going on there and how the parameters and scene characteristics influence your results. ESA has compiled very good documents for this: http://www.esa.int/About_Us/ESA_Publications/InSAR_Principles_Guidelines_for_SAR_Interferometry_Processing_and_Interpretation_br_ESA_TM-19
This is also a nice tutorial but it refers to an old version of SNAP and many things changed in the meanwhile: https://saredu.dlr.de/unit/insar_deformation

  1. coregister the images
  2. create inferferogram and coherence
  3. subtract topographic phase
  4. optionally multi-look or filter the interferogram
  5. unwrap the interferogram
  6. convert unwrapped interferogram to displacement
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