Significant different pattern in unwrapped

[Sayyed Mohammad Javad Mirzadeh]

Hi all,

I analyzed the time series using the MintPy and ASF HyP3 service outputs. When I checked the temporal coherence and numTriNonzeroIntAmbiguity plots, I found a different pattern in the southwest part of the area, which can be related to several ifgs unwrapped with high uncertainties.

Could you please kindly guide me on how I can recognize the problematic ifgs to avoid this pattern in the final result?

Sincerely,

Sayyed

[Zhang Yunjun]

Hi Sayyed,

I agree that those should be caused by phase unwrapping errors in some of the interferograms. To identify them, I usually plot the unwrapped phase within the range of [-15, 15] radians, then the PU error will be shown as sharp phase jumps.

Cheers,

Yunjun

[Sayyed Mohammad Javad Mirzadeh]

Hi Yunjun,

Thanks for your confirmation and for suggesting a way to recognize them.

I plotted all ifgs individually in the range of [-3.14, 3.14] in the wrapped style, but I will follow your suggestion to see how I can find them.

I can see this style of PU error in several frames including the mountainous areas. 

Sincerely,

Sayyed

[Sayyed Mohammad Javad Mirzadeh]

Hi Yunjun,

Thank you for your method to investigate the PU in the unwrapped results.

I plotted them but am worried about selecting the wrong candidates since I see many abnormal unwrapped ones in my case.

Could you please share any samples from the sharp phase jumps that can be interpreted as PU?

Sincerely,

Sayyed