Confusing Resulting Unwrapped Image

Microwave Toolbox Interferometry
1

Good day everyone. I’m new to interferometry and I’m currently working on land deformations. I followed the RUS demo on subsidence (https://www.youtube.com/watch?v=9__baWNmoJQ). My problem is the phase unwrapping part. I can’t get the coherence files from doing this graph;

Screenshot (13)
Screenshot (13)1920×1080 945 KB

…so I followed the instructions on how to show the coherence files from a topic from this forum (Snaphu export does not generate a corrfile)

My problem is that after doing the Snaphu Import step, the resulting unwrapped image looked too confusing and is very very different compared to the phase image from the previous step;

Phase_ifg_VV_03Apr2017_22Jun2020:

Screenshot (14)
Screenshot (14)1920×1080 1.5 MB

Unw_Phase_ifg_03Apr2017_22Jun2020:

Screenshot (15)
Screenshot (15)1920×1080 524 KB

It looked really wrong for me and I really don’t know where I went wrong. Hoping someone could enlighten me. I’m a graduating student and this study is crucial so that I could finally graduate. Thank you

2

The temporal baseline is way too long and your interferogram is just noise in most areas. Unwrapping noisew does not produce anything useful.

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3

What can I possibly do to further improve the results? Thank you

4

Please have a look at the ESA documents on the selection of suitable image pairs: InSAR Principles: Guidelines for SAR Interferometry Processing and Interpretation (ESA TM-19) (especially part B)

Many notes are also given in thse tutorials:

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