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DOC: Add note to docs on DataTree root-group naming conventions #9298

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Aug 2, 2024
Merged

DOC: Add note to docs on DataTree root-group naming conventions #9298

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64b1d84
DOC: Add note to docs on DataTree root-group naming conventions (root…
kmuehlbauer Jul 31, 2024
d1b29cb
Update xarray/core/datatree.py
kmuehlbauer Jul 31, 2024
31199e6
Update xarray/core/datatree.py
kmuehlbauer Aug 1, 2024
a297c9e
Update xarray/core/datatree.py
kmuehlbauer Aug 1, 2024
e68e470
Update xarray/datatree_/docs/source/io.rst
kmuehlbauer Aug 1, 2024
fa32e0a
Update xarray/datatree_/docs/source/io.rst
kmuehlbauer Aug 1, 2024
9fc8cf4
Merge branch 'main' into datatree-root-node-name
kmuehlbauer Aug 1, 2024
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12 changes: 11 additions & 1 deletion xarray/core/datatree.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1551,7 +1551,12 @@ def to_netcdf(
``dask.delayed.Delayed`` object that can be computed later.
Currently, ``compute=False`` is not supported.
kwargs :
Addional keyword arguments to be passed to ``xarray.Dataset.to_netcdf``
Additional keyword arguments to be passed to ``xarray.Dataset.to_netcdf``

Note
----
Due to file format specifications the on-disk root group name
is always ``"/"`` overriding any given ``DataTree`` root node name.
"""
from xarray.core.datatree_io import _datatree_to_netcdf

Expand Down Expand Up @@ -1607,6 +1612,11 @@ def to_zarr(
supported.
kwargs :
Additional keyword arguments to be passed to ``xarray.Dataset.to_zarr``

Note
----
Due to file format specifications the on-disk root group name
is always ``"/"`` overriding any given ``DataTree`` root node name.
"""
from xarray.core.datatree_io import _datatree_to_zarr

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11 changes: 11 additions & 0 deletions xarray/datatree_/docs/source/io.rst
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Expand Up @@ -24,6 +24,12 @@ To open a whole netCDF file as a tree of groups use the :py:func:`open_datatree`
To save a DataTree object as a netCDF file containing many groups, use the :py:meth:`DataTree.to_netcdf` method.


.. _netcdf.root_group.note:

.. note::
Due to file format specifications the on-disk root group name is always ``"/"``,
overriding any given ``DataTree`` root node name.

.. _netcdf.group.warning:

.. warning::
Expand Down Expand Up @@ -52,3 +58,8 @@ To save a DataTree object as a zarr store containing many groups, use the :py:me
.. note::
Note that perfect round-tripping should always be possible with a zarr store (:ref:`unlike for netCDF files <netcdf.group.warning>`),
as zarr does not support "unused" dimensions.

For the root group the same restrictions (:ref:`as for netCDF files <netcdf.root_group.note>`) apply.
Due to file format specifications the on-disk root group name is always ``"/"``
overriding any given ``DataTree`` root node name.

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