Low coherence zone removal

How to remove the low coherence zone? Is it necessary that the cut-off number will the same for iw1and iw2. While we have the different deformation rate?

you mean if you should apply the same coherence threshold for different sub-swaths?

It would make sense too me to, but maybe a screenshot of your data would help to clarify your question.

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have you tried to apply TOPS merge before the terrain correction so that both swath are in the same product?