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id node_id number title user state locked assignee milestone comments created_at updated_at ▲ closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
424265093 MDExOlB1bGxSZXF1ZXN0MjYzNjU2Nzcz 2844 Read grid mapping and bounds as coords DWesl 22566757 closed 0     38 2019-03-22T15:25:37Z 2021-02-17T16:35:56Z 2021-02-17T16:35:56Z CONTRIBUTOR   0 pydata/xarray/pulls/2844

I prefer having these as coordinates rather than data variables.

This does not cooperate with slicing/pulling out individual variables. grid_mapping should only be associated with variables that have horizontal dimensions or coordinates. bounds should stay associated despite having more dimensions.

I have not implemented similar functionality for the iris conversions.

An alternate approach to dealing with bounds (not used here) is to use a pandas.IntervalIndex http://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.IntervalIndex.html#pandas.IntervalIndex and use where the coordinate is within its cell to determine on which side the intervals are closed (x_dim == x_dim_bnds[:, 0] corresponds to "left", x_dim == x_dim_bnds[:, 1] corresponds to "right", and anything else is "neither"). This would stay through slicing and might already be used for .groupby_bins(), but would not generalize to boundaries of multidimensional coordinates unless someone implements a multidimensional generalization of pd.IntervalIndex

  • [ ] Closes #xxxx
  • [X] Tests added
  • [ ] Fully documented, including whats-new.rst for all changes and api.rst for new API
 
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     xarray 13221727 pull
424262546 MDExOlB1bGxSZXF1ZXN0MjYzNjU0NzQ0 2843 Allow passing _FillValue=False in encoding for vlen str variables. DWesl 22566757 closed 0     2 2019-03-22T15:20:27Z 2019-03-30T14:04:30Z 2019-03-30T14:04:13Z CONTRIBUTOR   0 pydata/xarray/pulls/2843

The documentation seems to imply that passing _FillValue=False in the encoding works to set no fill value for any value. These changes to netCDF4_.py and h5netcdf_.py seem to allow this for variables that are vlen strings (dtype str rather than "S1"): I have used the code-path in netCDF4_.py in real code and know that it at least allows the save to complete.

Allowing _FillValue=False makes it easier to explicitly exclude _FillValue from being written for coordinate variables, which some CF-compliance checkers complain about.

  • [ ] Closes #xxxx
  • [X] Tests added
  • [ ] Fully documented, including whats-new.rst for all changes and api.rst for new API
 
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     xarray 13221727 pull

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