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  • netcdf roundtrip fails to preserve the shape of numpy arrays in attributes · 3 ✖

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417008887 https://github.com/pydata/xarray/issues/2251#issuecomment-417008887 https://api.github.com/repos/pydata/xarray/issues/2251 MDEyOklzc3VlQ29tbWVudDQxNzAwODg4Nw== shoyer 1217238 2018-08-29T16:06:28Z 2018-08-29T16:06:28Z MEMBER

I filed a bug report for netCDF4-Python: https://github.com/Unidata/netcdf4-python/issues/841

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  netcdf roundtrip fails to preserve the shape of numpy arrays in attributes 335608017
400428831 https://github.com/pydata/xarray/issues/2251#issuecomment-400428831 https://api.github.com/repos/pydata/xarray/issues/2251 MDEyOklzc3VlQ29tbWVudDQwMDQyODgzMQ== shoyer 1217238 2018-06-26T19:08:57Z 2018-06-26T19:08:57Z MEMBER

If I remember correctly, netCDF intentionally does not support multi-dimensional array attributes. I'm not sure why it silently changes shape, though. An error message would seem much more user-friendly to me. Possibly this is worth raising on the netCDF4 issue tracker: https://github.com/unidata/netcdf4-python

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  netcdf roundtrip fails to preserve the shape of numpy arrays in attributes 335608017
400411869 https://github.com/pydata/xarray/issues/2251#issuecomment-400411869 https://api.github.com/repos/pydata/xarray/issues/2251 MDEyOklzc3VlQ29tbWVudDQwMDQxMTg2OQ== fmaussion 10050469 2018-06-26T18:12:45Z 2018-06-26T18:16:53Z MEMBER

I have some metadata that is in the form of numpy arrays.

The short answer is: storing arrays (or other objects) as attributes is not easy. When you do so, xarray has to convert them at serialization, and the roundtrip conserving the shape cannot be achieved because it isn't available in the datamodel of NetCDF.

What is it you are storing as 2D arrays? Would a coordinate variable be an option?

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  netcdf roundtrip fails to preserve the shape of numpy arrays in attributes 335608017

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