Unable to generate unwrapPhase_phaseClosure file

[yyy1106]

UnwrapPhase_phaseClosure file cannot be generated in the step mintpy_ifgram_correction when using the phase_closure unwrap error correction method

<I am working with image data around the reservoir using the mintpy.unwrapError.method = phase_closure method for unwrap, but in the step run_07_mintpy_ifgram_correction, it never generates the unwrapPhase_phaseClosure file. The maskConnComp.h5 I generate only contains False values (no valid pixels). My avgSpatialCoh.h5 coherence ranges from 0.1 to 0.95, with an average value around 0.3. Even though I set mintpy.network.minCoherence = 0.1 and mintpy.unwrapError.connCompMinArea = 20, I still can't generate the unwrapPhase_phaseClosure file. In addition, I am using another study area which is mountainous and I am getting the same error, the generated maskConnComp.h5 also contains only False values (no valid pixels) and avgSpatialCoh.h5 coherence ranges from 0.12 to 0.97. The rest of the configuration information is in the uploaded image. Please help to answer>

Full script that generated the error

unwrap_error_phase_closure.py
/mnt/f/lingshan/lingshan_shuiku_crop_out1/miaplpy/sbas/network_delaunay_4/inputs/ifgramStack.h5
--template /mnt/f/lingshan/lingshan_shuiku_crop_out1/miaplpy/sbas/network_delaunay_4/smallbaselineApp.cfg
--update
--cc-mask /mnt/f/lingshan/lingshan_shuiku_crop_out1/miaplpy/sbas/network_delaunay_4/maskConnComp.h5

Full error message

******************** step - correct_unwrap_error ********************
calculating the integer ambiguity for the common regions defined in /mnt/f/lingshan/lingshan_shuiku_crop_out1/miaplpy/sbas/network_delaunay_4/maskConnComp.h5
reference pixel in y/x: (349, 1226) from dataset: unwrapPhase
number of interferograms: 205
number of triplets: 93
read common mask from /mnt/f/lingshan/lingshan_shuiku_crop_out1/miaplpy/sbas/network_delaunay_4./maskConnComp.h5
remove regions with area < 20
number of common regions: 0
WARNING: NO common region found! Try a smaller value for the mintpy.unwrapError.connCompMinArea (20.0) option.
skip phase closure correction ...

System information

• Operating system:
• Python environment:
• MintPy version:
• InSAR processor/product:

[yyy1106]

Additional Notes:
I again used Mexico City as the study area for the above parameters, which are as follows:31 Sentinel-1A images acquired between November 1, 2019 and November 1, 2020.This area is located in the centre of Mexico City and has a high degree of correlation, but I used it in the seventh step mintpy_ ifgram_correction, I still can't generate the unwrapPhase_phaseClosure file. Attached are screenshots of avgSpatialCoh and maskConnComp images. You can see that the maskConnComp file is still 0. In addition, I have updated /mintpy/cli/unwrap_error_phase_closure.py, src/mintpy/objects/conncomp.py and src/mintpy/unwrap_error_ phase_closure.py. phase_closure.py file code.

[ditafaith]

Did you generate interferograms using ISCE?
This place, actually, is for MintPy. Even some cases are related to interferogram generators such as ISCE.

[yyy1106]

Dear ditafaith, thank you for your reply. I did use ISCE's stackSentinel.py script during image preprocessing. But the interference file was not generated in my pre-processed file. My interference files were generated under MintPy. Do you have any good ideas to help me solve this problem? Thanks again for your question.

您是否使用 ISCE 生成了干涉图？这个地方，实际上是给 MintPy 的。甚至有些情况也与干涉图发生器有关，例如 ISCE。

[ditafaith]

It seems you are on the right way. I am little bit confuse since you showed the configuration under miaplpy, instead of MintPy
Anyway, change this value to lowest, such 1, mintpy.unwrapError.connCompMinArea = 1. Then, cleaned all data and re-run again. If the error remains, then maybe the problem is related to the ConComp file. If so, you can't use phase unwrapping correction.

[yyy1106]

Dear ditafaith, I would like to add a clarification. My data was aligned by ISCE to form the slc and then the interferometric data was generated in Miaplpy. May I ask if this will affect the generation of ConComp files.

It seems you are on the right way. I am little bit confuse since you showed the configuration under miaplpy, instead of MintPy Anyway, change this value to lowest, such 1, mintpy.unwrapError.connCompMinArea = 1. Then, cleaned all data and re-run again. If the error remains, then maybe the problem is related to the ConComp file. If so, you can't use phase unwrapping correction.

[ditafaith]

I understood, but this is for MintPy, not Miaplpy.
Sorry, I can’t help in this situation.