Function to combine Kerchunks into datatree kerchunks.

[abkfenris]

🚀 Feature Request

Add a function that can take a dictionary of references to Kerchunk files and combine them into a single datatree kerchunk with a similar interface to

xarray_fmrc/xarray_fmrc/build_datatree.py

Lines 35 to 65 in 7203708

	def from_dict(
	datasets: Dict["DatetimeScalar", xr.Dataset],
	group_prefix: str = constants.DEFAULT_GROUP_PREFIX,
	time_format: str = constants.DEFAULT_TIME_FORMAT,
	time_coord: Optional[str] = None,
	forecast_coords: Optional[List[str]] = None,
	tree_attrs: Optional[dict[str, Any]] = None,
	) -> datatree.DataTree:
	"""Build a datatree from a dictionary of forecast reference times to datasets"""
	path_dict = {}
	for dt, ds in datasets.items():
	path = model_run_path(dt, group_prefix, time_format)
	path_dict[path] = ds
	tree = datatree.DataTree.from_dict(path_dict)
	if tree_attrs is None:
	tree_attrs = {}
	tree_attrs[constants.DT_ATTR_GROUP_PREFIX] = group_prefix
	tree_attrs[constants.DT_ATTR_TIME_FORMAT] = time_format
	if time_coord:
	tree_attrs[constants.DT_ATTR_TIME_COORD] = time_coord
	if forecast_coords:
	tree_attrs[constants.DT_ATTR_FORECAST_COORDS] = forecast_coords
	tree.attrs = tree_attrs
	return tree

🔈 Motivation

It would be really nice to be able to be more lazy when building datatrees.

🛰 Alternatives

Creative Kerchunking ahead of time into each variety of dataset similar to what Matt is doing.

📎 Additional context

See fsspec/kerchunk#357 for example on how to build up the json.

Kerchunk reference spec