04 mask doesn't works

[HN-Jiang]

Dear yumorishita,
I have a problem with step 04. I try to mask before go futher. But I think it doesn't works. Even I try 0.9 as threshold, nothing has been masked. Can you please help me take a look?

By the way I'm using LiCSBAS2 now.,

202408151546batch_LiCSBAS_04_05.log

[yumorishita]

Check coh_avg.png. If you want to keep more pixels, you should decrease the threshold.

[HN-Jiang]

HI，here is the coh_avg.png. I try 0.1 to 0.9 for mask, but seems nothing has been masked. Because mask.png shows nothing and also in each interferogram file, the file yyyymmdd_yyyymmdd.unw.png is also umpty.

[yumorishita]

Maybe the output of step03 GACOS already contains no data. Please check GEOCml1GACOS.

[yumorishita]

I found the cause. The option -r 0:0/0:0 masks all pixels. Don't use it or you must specify a part of the area for -r.

[HN-Jiang]

Thank you. But sorry, I don't understand this, because as I understand, we can mask the whole image for getting more good interferogram(loop) for step 12. That's why I use -r 0:0/0:0. And ideally it should remove all the pixel that under the threshold, and keep the pixel with good quality. But It looks like all the pixel has been masked(removed).

And I also try to specify an area(My research area), also give the threshold as 0.3. It looks like the given region has been fully masked.

[yumorishita]

If you mask the whole image, we lose all data and get no result. -r option remove all pixels in the specified area regardless of coherence. If you want to keep the pixels with good quality, you should only use -c option.
If you have a specific area of interest, I recommend first clipping the area by step05 and then applying step04 to the clipped data.

[RaeGeoffrey]

what is -c option and -r option, where i can find it ?

[yumorishita]

https://github.com/yumorishita/LiCSBAS/wiki/2_2_step01_5#step-0-4-mask-unw-optional