Unable to read radiance with AVHRR EPS

[fwfichtner]

Describe the bug
It is not possible to read radiance with "avhrr_l1b_eps"-reader anymore

To Reproduce

scene = satpy.Scene(reader="avhrr_l1b_eps", filenames=[dataset_path])
scene.load(["1"], calibration="radiance")

Expected behavior
Judging by the reader I would expect that we can read it: https://github.com/pytroll/satpy/blob/e338294dd2b4924c11c7b08b22b28bc150ecd6f5/satpy/etc/readers/avhrr_l1b_eps.yaml#L20C20-L20C20

It used to be possible before a45f1a0

Actual results

Failed to load DataID(name='1', wavelength=WavelengthRange(min=0.58, central=0.63, max=0.68, unit='µm'), resolution=1050, calibration=<3>, modifiers=()) from <EPSAVHRRFile: '/Users/Username/Downloads/AVHR_xxx_1B_M03_20210421161603Z_20210421161903Z_N_O_20210421165617Z'>
Traceback (most recent call last):
  File "/opt/homebrew/Caskroom/miniforge/base/envs/stac/lib/python3.11/site-packages/satpy/readers/yaml_reader.py", line 699, in _load_dataset
    projectable = fh.get_dataset(dsid, ds_info)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Caskroom/miniforge/base/envs/stac/lib/python3.11/site-packages/satpy/readers/eps_l1b.py", line 299, in get_dataset
    dataset.attrs["units"] = self.units[key["calibration"]]
                             ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
KeyError: <3>
Could not load dataset 'DataID(name='1', wavelength=WavelengthRange(min=0.58, central=0.63, max=0.68, unit='µm'), resolution=1050, calibration=<3>, modifiers=())': "Could not load DataID(name='1', wavelength=WavelengthRange(min=0.58, central=0.63, max=0.68, unit='µm'), resolution=1050, calibration=<3>, modifiers=()) from any provided files"

Environment Info:

• OS: OSX, Windows
• Satpy Version: 0.45.0

[mraspaud]

Thanks for reporting this issue! I can reproduce it and will fix it soon.

[mraspaud]

@fwfichtner Should be fixed in #2655 , feel free to give it a try and report back.

[fwfichtner]

That was quick, thanks!

And it also works 🥇