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  • to_netcdf is not idempotent when stacking rename and set_coords · 1 ✖

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1527376059 https://github.com/pydata/xarray/issues/5170#issuecomment-1527376059 https://api.github.com/repos/pydata/xarray/issues/5170 IC_kwDOAMm_X85bCei7 kmuehlbauer 5821660 2023-04-28T10:47:38Z 2023-04-28T10:47:38Z MEMBER

@floriankrb Sorry for the long delay. If you are still interested in the source of the issue, here is what I found:

By default Xarray will promote any data variable which shares it's name with a dimension to a coordinate. That accounts for ['number', 'time', 'step', 'heightAboveGround', 'latitude', 'longitude']. valid_time is a two dimensional coordinate (by CF standard) and is a coordinate here because t2m data variable has a corresponding coordinates-attribute containing valid_time. In the decoding-step valid_time gets added to the .coords. The attribute is removed from t2m's attrs and kept in t2m.encoding. So far so good.

By renaming number to n that coordinates attribute (in encoding) does not change as well. So when the data is written, t2m will still hold number in it's coordinates-attribute (on disk).

The issue manifests on subsequent read as now the decoding-step tries to align the found coordinates with the available data variables. As number is not available, no coordinate from that string will be taken into account as coordinate (note the all on line 444):

https://github.com/pydata/xarray/blob/0f4e99d036b0d6d76a3271e6191eacbc9922662f/xarray/conventions.py#L439-L447

This can easily be observed by looking into t2m.attrs where the coordinates remains instead of being preserved in .encoding.

So the source of all problems here is that the renaming number -> n was missed for coordinates-attribute of t2m's .encoding.

 
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   to_netcdf is not idempotent when stacking rename and set_coords 859772411

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