[Help]: sbas.compute_align() failed

[Ay-mo]

AttributeError: 'NoneType' object has no attribute 'bounds'
"""

The above exception was the direct cause of the following exception:

AttributeError Traceback (most recent call last)
in <cell line: 1>()
3 sbas.compute_align(joblib_aligning_backend='threading')
4 else:
----> 5 sbas.compute_align()

6 frames
/usr/local/lib/python3.10/dist-packages/joblib/parallel.py in _return_or_raise(self)
752 try:
753 if self.status == TASK_ERROR:
--> 754 raise self._result
755 return self._result
756 finally:

AttributeError: 'NoneType' object has no attribute 'bounds'

[AlexeyPechnikov]

But how can I reproduce your case? Please share an example notebook on Google Colab so I can check.

[gals89]

Hi, Alex
I got the error in sbas.compute_align()

I have attached the link. https://colab.research.google.com/drive/11RTV1efvymFkAmfL_ju7MuYHQPXq2HWG?usp=drive_link

please advise

Thanks

---

_RemoteTraceback Traceback (most recent call last)
_RemoteTraceback:
"""
Traceback (most recent call last):
File "/usr/local/lib/python3.10/dist-packages/joblib/externals/loky/process_executor.py", line 463, in _process_worker
r = call_item()
File "/usr/local/lib/python3.10/dist-packages/joblib/externals/loky/process_executor.py", line 291, in call
return self.fn(*self.args, **self.kwargs)
File "/usr/local/lib/python3.10/dist-packages/joblib/parallel.py", line 589, in call
return [func(*args, **kwargs)
File "/usr/local/lib/python3.10/dist-packages/joblib/parallel.py", line 589, in
return [func(*args, **kwargs)
File "/usr/local/lib/python3.10/dist-packages/pygmtsar/Stack_align.py", line 232, in _align_rep_subswath
offset_dat = np.apply_along_axis(func, 1, offset_dat0)
File "/usr/local/lib/python3.10/dist-packages/numpy/lib/shape_base.py", line 376, in apply_along_axis
raise ValueError(
ValueError: Cannot apply_along_axis when any iteration dimensions are 0
"""

The above exception was the direct cause of the following exception:

ValueError Traceback (most recent call last)
in <cell line: 1>()
3 sbas.compute_align(joblib_aligning_backend='threading')
4 else:
----> 5 sbas.compute_align()

6 frames
/usr/local/lib/python3.10/dist-packages/pygmtsar/Stack_align.py in compute_align(self, geometry, dates, n_jobs, degrees, joblib_aligning_backend, debug)
867 with self.tqdm_joblib(tqdm(desc='Aligning Repeat', total=len(dates_rep)*len(subswaths))) as progress_bar:
868 # threading backend is the only one working inside Docker container to run multiple binaries in parallel
--> 869 joblib.Parallel(n_jobs=n_jobs, backend=joblib_aligning_backend)(joblib.delayed(self._align_rep_subswath)(subswath, date, degrees=degrees, debug=debug)
870 for date in dates_rep for subswath in subswaths)
871

/usr/local/lib/python3.10/dist-packages/joblib/parallel.py in call(self, iterable)
1950 next(output)
1951
-> 1952 return output if self.return_generator else list(output)
1953
1954 def repr(self):

/usr/local/lib/python3.10/dist-packages/joblib/parallel.py in _get_outputs(self, iterator, pre_dispatch)
1593
1594 with self._backend.retrieval_context():
-> 1595 yield from self._retrieve()
1596
1597 except GeneratorExit:

/usr/local/lib/python3.10/dist-packages/joblib/parallel.py in _retrieve(self)
1697 # worker traceback.
1698 if self._aborting:
-> 1699 self._raise_error_fast()
1700 break
1701

/usr/local/lib/python3.10/dist-packages/joblib/parallel.py in _raise_error_fast(self)
1732 # called directly or if the generator is gc'ed.
1733 if error_job is not None:
-> 1734 error_job.get_result(self.timeout)
1735
1736 def _warn_exit_early(self):

/usr/local/lib/python3.10/dist-packages/joblib/parallel.py in get_result(self, timeout)
734 # callback thread, and is stored internally. It's just waiting to
735 # be returned.
--> 736 return self._return_or_raise()
737
738 # For other backends, the main thread needs to run the retrieval step.

/usr/local/lib/python3.10/dist-packages/joblib/parallel.py in _return_or_raise(self)
752 try:
753 if self.status == TASK_ERROR:
--> 754 raise self._result
755 return self._result
756 finally:

ValueError: Cannot apply_along_axis when any iteration dimensions are 0

[AlexeyPechnikov]

The notebook is not publicly accessible.

[gals89]

sorry, I update the link

here is,

https://colab.research.google.com/drive/1H1ApvooTTPz_OSvZqurHxLxswCDFepoE?usp=sharing

[AlexeyPechnikov]

You are trying to calculate an interferogram for a 10-year interval, which does not make sense.

[gals89]

Is it just the reason why the error is occurring?, or is there another reason?, I can change it to other years if that solves the problem. let say 3 years back, sorry this is the first time I was using pygmtsar and I also brought your Kindle book as reference

[AlexeyPechnikov]

No, the error is related to an incomplete DEM. Sentinel-1 alignment is purely geometrical based on a digital elevation model, but some Copernicus DEM tiles are missing for your area. You might use SRTM DEM or another alternative to resolve the issue.

[gals89]

Okay, Thank You, I understand