issue_comments: 701973665

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https://github.com/pydata/xarray/issues/4471#issuecomment-701973665 https://api.github.com/repos/pydata/xarray/issues/4471 701973665 MDEyOklzc3VlQ29tbWVudDcwMTk3MzY2NQ== 500246 2020-10-01T08:20:20Z 2020-10-01T08:20:20Z CONTRIBUTOR

Probably related: when reading an open file through a file system instance, the _FillValue, scale_factor, and add_offset are arrays of length one. When opening by passing a filename, those are all scalar (as expected):

python import xarray from fsspec.implementations.local import LocalFileSystem fn = "/data/gholl/cache/fogtools/abi/2017/03/14/20/06/7/OR_ABI-L1b-RadF-M3C07_G16_s20170732006100_e20170732016478_c20170732016514.nc" ds1 = xarray.open_dataset(fn, decode_cf=True, mask_and_scale=False) print(ds1["esun"].attrs["_FillValue"]) print(ds1["Rad"].attrs["scale_factor"]) with LocalFileSystem().open(fn) as of: ds2 = xarray.open_dataset(of, decode_cf=True, mask_and_scale=False) print(ds2["esun"].attrs["_FillValue"]) print(ds2["Rad"].attrs["scale_factor"])

Result:

-999.0 0.001564351 [-999.] [0.00156435]

I strongly suspect that this is what causes the ValueError, and in any case it also causes downstream problems even if opening succeeds as per the previous comment.

 
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