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Experiment with stacking for kerchunk #38

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Experiment with stacking for kerchunk #38

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b1688a7
Experiment with native stacking for kerchunk
jsignell Mar 11, 2024
40f381b
Merge branch 'main' into js/kerchunk-stacking
jsignell Apr 5, 2024
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38 changes: 29 additions & 9 deletions xpystac/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@
@functools.singledispatch
def to_xarray(
obj,
stacking_library: Union[Literal["odc.stac", "stackstac"], None] = None,
stacking_library: Union[Literal["odc.stac", "stackstac", "xpystac"], None] = None,
**kwargs,
) -> xarray.Dataset:
"""Given a PySTAC object return an xarray dataset.
Expand Down Expand Up @@ -42,10 +42,11 @@ def to_xarray(

@to_xarray.register(pystac.Item)
@to_xarray.register(pystac.ItemCollection)
@to_xarray.register(list)
def _(
obj: Union[pystac.Item, pystac.ItemCollection],
drop_variables: Union[str, List[str], None] = None,
stacking_library: Union[Literal["odc.stac", "stackstac"], None] = None,
stacking_library: Union[Literal["odc.stac", "stackstac", "xpystac"], None] = None,
**kwargs,
) -> xarray.Dataset:
if drop_variables is not None:
Expand All @@ -56,17 +57,21 @@ def _(
_import_optional_dependency("odc.stac")
stacking_library = "odc.stac"
except ImportError:
_import_optional_dependency("stackstac")
stacking_library = "stackstac"
elif stacking_library not in ["odc.stac", "stackstac"]:
try:
_import_optional_dependency("stackstac")
stacking_library = "stackstac"
except ImportError:
stacking_library = "xpystac"
elif stacking_library not in ["odc.stac", "stackstac", "xpystac"]:
raise ValueError(f"{stacking_library=} is not a valid option")

if isinstance(obj, pystac.Item):
items = [obj]
else:
items = [i for i in obj]

if stacking_library == "odc.stac":
odc_stac = _import_optional_dependency("odc.stac")
if isinstance(obj, pystac.Item):
items = [obj]
else:
items = [i for i in obj]
return odc_stac.load(items, **{"chunks": {"x": 1024, "y": 1024}, **kwargs})
elif stacking_library == "stackstac":
stackstac = _import_optional_dependency("stackstac")
Expand All @@ -81,6 +86,21 @@ def _(
b = b.drop_vars(scalar_coords)
bands[band] = b
return xarray.Dataset(bands, attrs=da.attrs)
else:
media_type = kwargs.get("media_type")
role = kwargs.get("role")
combine_kwargs = {
"combine_attrs": "drop_conflicts",
**kwargs.pop("combine_kwargs", {}),
}
asset_kwargs = {**kwargs.pop("asset_kwargs", {}), **kwargs}

dataset_list = []
for item in items:
for asset in item.get_assets(media_type=media_type, role=role).values():
dataset_list.append(to_xarray(asset, **asset_kwargs))

return xarray.combine_by_coords(dataset_list, **combine_kwargs)


@to_xarray.register
Expand Down
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