Coherence threshold too strict. No points left for reliable ESD estimate

[Karthi-Wolf]

Is the coherence threshold (default 0.85) made this problem because it's too strict, If so, do i need to reduce it, what should i go for
also, do i need to change it from the beginning like "stackSentinel.py ......-o.. -a.. -s.. -d.. -e 0.65" or i can change in-between and continue?

"Traceback (most recent call last):
File "/home/incois/mohanty/.conda/envs/insar_env/share/isce2/topsStack/SentinelWrapper.py", line 251, in
main(args.start,args.end)
File "/home/incois/mohanty/.conda/envs/insar_env/share/isce2/topsStack/SentinelWrapper.py", line 242, in main
cfgParser.runCmd()
File "/home/incois/mohanty/.conda/envs/insar_env/share/isce2/topsStack/SentinelWrapper.py", line 54, in runCmd
func_modules.main(self.funcParams[section])
File "/home/incois/mohanty/.conda/envs/insar_env/share/isce2/topsStack/estimateAzimuthMisreg.py", line 138, in main
raise Exception('Coherence threshold too strict. No points left for reliable ESD estimate')
Exception: Coherence threshold too strict. No points left for reliable ESD estimate
Traceback (most recent call last):
File "/home/incois/mohanty/.conda/envs/insar_env/share/isce2/topsStack/SentinelWrapper.py", line 251, in
main(args.start,args.end)
File "/home/incois/mohanty/.conda/envs/insar_env/share/isce2/topsStack/SentinelWrapper.py", line 242, in main
cfgParser.runCmd()
File "/home/incois/mohanty/.conda/envs/insar_env/share/isce2/topsStack/SentinelWrapper.py", line 54, in runCmd
func_modules.main(self.funcParams[section])
File "/home/incois/mohanty/.conda/envs/insar_env/share/isce2/topsStack/estimateAzimuthMisreg.py", line 144, in main
hist, bins = np.histogram(val, 50, normed=1)
TypeError: histogram() got an unexpected keyword argument 'normed'"

[fdelgadodelapuente]

that happens when the coherence in the burst overlap regions is too low. Those forward and backward burst overlap interferograms go into the ESD calculation. This could happen if the overall interferogram coherence is too low.

[Karthi-Wolf]

Hi Mr. Francisco, Thanks for your reply. In this case Mr. Piyush Agaram said to not to choose ESD below 0.7, what can I do to possibly run without errors?
your help will be greatly appreciated.
Regards.

[fdelgadodelapuente]

Reduce the ESD coherencw threshold until the inversion runs without errors.

[Karthi-Wolf]

Thanks, earlier I was reducing small amount (like reducing 0.7 to 0.6 to 0.5 to ...0.3) It ran when ESD reached 0.3.
But
This is from the topsApp.ipynb

I am just concerned about the threshold, as being said to not to go below 0.7 . Can you please confirm that I can run with esd 0.3? If I run with the 0.3 what's the consequences will arise?

Regards

[fdelgadodelapuente]

I have decreased it to 0.5 in regions with low coherence and ESD still does a good job at correcting the jumps between the bursts.