Thank you very much @mfoumelis for your guidance and supervision of the results.
In next step, I shall try multi-looking. I would also be grateful to you if I could know what type of heavy filtering is suitable in this case for optically pleasing and easier unwarping? The ESA/SEOM team have published very pleasing interferogram of the same pair of image I used in the link I posted before. But, I do not know what techniques they used for it…
To have a more spatially smooth results you can selected large multilooking widows or increase the window size when e.g. apply the Goldstien filtering. However, I would not recommend that (maybe not clear in my previous message) as this will results in affecting the final displacement values.
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