Resampling flash_duration fails with a ValueError exception

[gerritholl]

Describe the bug

Resampling flash_duration fails with ValueError immediately upon calling resample. This is probably because flash_duration is a timedelta (dtype m8[ns]), although fundamentally operations that work on ints or floats should also work on timedelta, so resampling should be possible in principle.

To Reproduce

from satpy import Scene
from glob import glob
from satpy.utils import debug_on; debug_on()

pat = "/media/nas/x23352/MTG/LI/L2/2024/07/01/10/*LFL*BODY*_0061*.nc"
filenames = glob(pat)
sc = Scene(filenames, reader="li_l2_nc")
sc.load(["flash_duration"])
ls = sc.resample("eurol")
ls.save_datasets()

Expected behavior

I expect an output with a resampled flash duration.

Actual results

[DEBUG: 2024-07-05 14:06:17 : satpy.readers.yaml_reader] Reading ('/data/gholl/checkouts/satpy/satpy/etc/readers/li_l2_nc.yaml',)
[DEBUG: 2024-07-05 14:06:17 : satpy.readers.yaml_reader] Assigning to li_l2_nc: ['/media/nas/x23352/MTG/LI/L2/2024/07/01/10/W_XX-EUMETSAT-Darmstadt,IMG+SAT,MTI1+LI-2-LFL--FD--CHK-BODY---NC4E_C_EUMT_20240701100747_L2PF_OPE_20240701100723_20240701100733_N__T_0061_0045.nc', '/media/nas/x23352/MTG/LI/L2/2024/07/01/10/W_
XX-EUMETSAT-Darmstadt,IMG+SAT,MTI1+LI-2-LFL--FD--CHK-BODY---NC4E_C_EUMT_20240701100524_L2PF_OPE_20240701100503_20240701100513_N__T_0061_0031.nc', '/media/nas/x23352/MTG/LI/L2/2024/07/01/10/W_XX-EUMETSAT-Darmstadt,IMG+SAT,MTI1+LI-2-LFL--FD--CHK-BODY---NC4E_C_EUMT_20240701100425_L2PF_OPE_20240701100403_20240701100413_
N__T_0061_0025.nc', '/media/nas/x23352/MTG/LI/L2/2024/07/01/10/W_XX-EUMETSAT-Darmstadt,IMG+SAT,MTI1+LI-2-LFL--FD--CHK-BODY---NC4E_C_EUMT_20240701100026_L2PF_OPE_20240701100003_20240701100013_N__T_0061_0001.nc', '/media/nas/x23352/MTG/LI/L2/2024/07/01/10/W_XX-EUMETSAT-Darmstadt,IMG+SAT,MTI1+LI-2-LFL--FD--CHK-BODY---N
C4E_C_EUMT_20240701101015_L2PF_OPE_20240701100953_20240701101003_N__T_0061_0060.nc', '/media/nas/x23352/MTG/LI/L2/2024/07/01/10/W_XX-EUMETSAT-Darmstadt,IMG+SAT,MTI1+LI-2-LFL--FD--CHK-BODY---NC4E_C_EUMT_20240701100035_L2PF_OPE_20240701100013_20240701100023_N__T_0061_0002.nc', '/media/nas/x23352/MTG/LI/L2/2024/07/01/1
0/W_XX-EUMETSAT-Darmstadt,IMG+SAT,MTI1+LI-2-LFL--FD--CHK-BODY---NC4E_C_EUMT_20240701100724_L2PF_OPE_20240701100703_20240701100713_N__T_0061_0043.nc', '/media/nas/x23352/MTG/LI/L2/2024/07/01/10/W_XX-EUMETSAT-Darmstadt,IMG+SAT,MTI1+LI-2-LFL--FD--CHK-BODY---NC4E_C_EUMT_20240701100635_L2PF_OPE_20240701100613_20240701100
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[DEBUG: 2024-07-05 14:06:17 : satpy.readers.li_base_nc] Product type is: 2-LFL
[DEBUG: 2024-07-05 14:06:17 : satpy.readers.li_base_nc] Adding 12 datasets for 2-LFL input product.
[DEBUG: 2024-07-05 14:06:17 : satpy.readers.li_l2_nc] The current product 2-LFL is not an accumulated product so it will not be regridded.
[snip]
[DEBUG: 2024-07-05 14:06:18 : satpy.readers.li_l2_nc] The current product 2-LFL is not an accumulated product so it will not be regridded.
[DEBUG: 2024-07-05 14:06:18 : satpy.readers.li_base_nc] Product type is: 2-LFL
[DEBUG: 2024-07-05 14:06:18 : satpy.readers.li_base_nc] Adding 12 datasets for 2-LFL input product.
[DEBUG: 2024-07-05 14:06:18 : satpy.readers.li_l2_nc] The current product 2-LFL is not an accumulated product so it will not be regridded.
[DEBUG: 2024-07-05 14:06:18 : satpy.composites.config_loader] Looking for composites config file li.yaml
[DEBUG: 2024-07-05 14:06:18 : satpy.composites.config_loader] Looking for composites config file visir.yaml
[DEBUG: 2024-07-05 14:06:18 : pyorbital.tlefile] Path to the Pyorbital configuration (where e.g. platforms.txt is found): /data/gholl/mambaforge/envs/py312/lib/python3.12/site-packages/pyorbital/etc
[DEBUG: 2024-07-05 14:06:18 : satpy.readers.yaml_reader] No coordinates found for DataID(name='longitude', modifiers=())
[DEBUG: 2024-07-05 14:06:18 : satpy.readers.yaml_reader] No coordinates found for DataID(name='latitude', modifiers=())
[DEBUG: 2024-07-05 14:06:18 : satpy.scene] Resampling DataID(name='flash_duration', modifiers=())
[INFO: 2024-07-05 14:06:18 : satpy.scene] Not reducing data before resampling.
[INFO: 2024-07-05 14:06:18 : satpy.resample] Using default KDTree resampler
Traceback (most recent call last):
  File "/data/gholl/checkouts/protocode/test-li.py", line 10, in <module>
    ls = sc.resample("eurol")
         ^^^^^^^^^^^^^^^^^^^^
  File "/data/gholl/checkouts/satpy/satpy/scene.py", line 977, in resample
    self._resampled_scene(new_scn, destination, resampler=resampler,
  File "/data/gholl/checkouts/satpy/satpy/scene.py", line 893, in _resampled_scene
    res = resample_dataset(dataset, destination_area, **kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/gholl/checkouts/satpy/satpy/resample.py", line 1073, in resample_dataset
    new_data = resample(source_area, dataset, destination_area, fill_value=fill_value, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/gholl/checkouts/satpy/satpy/resample.py", line 1036, in resample
    res = resampler_instance.resample(data, **kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/gholl/mambaforge/envs/py312/lib/python3.12/site-packages/pyresample/resampler.py", line 140, in resample
    kwargs['mask'] = data == data.attrs.get('_FillValue', np.iinfo(data.dtype.type).max)
                                                          ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/gholl/mambaforge/envs/py312/lib/python3.12/site-packages/numpy/_core/getlimits.py", line 697, in __init__
    raise ValueError("Invalid integer data type %r." % (self.kind,))
ValueError: Invalid integer data type 'm'.

Environment Info:

• Satpy Version: main (v0.49.0-141-g65d28f385)
• PyResample Version: main (v1.28.4-2-g632901b)

Additional context

It does not depend on the resampler.

It might be caused by this numpy issue, where np.issubdtype("m8", np.integer) returns True, but at the same time a timedelta is invalid (ValueError) to pass to np.iinfo.

numpy/numpy#26861

[gerritholl]

When I search for it in the readers list , I can't find it
ValueError: No reader named: li_l2_nc

Make sure you have the latest satpy and installed necessary dependencies. You can use satpy.available_readers() to check for warnings on missing dependencies.

[ameraner]

Hi @markjinz , I believe your code and error is coming from the Eumetlab jupyter notebooks, which are not maintained here, but rather by the EUM trainer team. Please report issues specific to those notebooks on the according EUM Gitlab. This issue by Gerrit is related to a fully different problem, so let's try not to confuse things:)

[gerritholl]

Hi @ameraner , thank you for the clarification but I believe we can discuss all issues related to SATPY here ?!

If you have a satpy question/bug report/feature request that is not the same as this one, please open a new issue using "New issue" button on the top right.