Update DataCube Extension to the latest version (support in assets)

[m-mohr]

The data cube extension is available in 2.1.0 and now supports fields also in assets. It would be nice to support this.

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Original post:

I'm trying to use the DataCube extension in PySTAC, but I'm struggling:

        asset = Asset.from_dict({...})
        item.add_asset("netcdf", asset)
        dc = DatacubeExtension.ext(asset, add_if_missing=True)
        for key, dim in dataset.dimensions.items():
            dc.dimensions[dim.name] = AdditionalDimension({...})
        for key, var in dataset.variables.items():
            dc.variables[var.name] = Variable({...})

I'm getting: <AssetDatacubeExtension Item id=tests/data-files/OR_GLM-L2-LCFA_G16_s20203662359400_e20210010000004_c20210010000030.ncdoes not have required property cube:dimensions

How is it meant to be used? Is this a bug?

[constantinius]

@m-mohr It looks like this is also an issue when used with Collections and Items. I also found out how it seems like it is meant to be used: the dimensions should be treated as immutable, and must be set to the DatacubeExtension as a whole, and not added piece wise. This works for me (both for Asset and Item):

datacube: DatacubeExtension

dimensions = {}

dimension = HorizontalSpatialDimension({
    ...
})
dimensions[name] = dimension

datacube.dimensions = dimensions

I think it is way to easy to get this wrong. At least some documentation is missing in how to use it the intended way.

[gadomski]

Datacube is now at v2.2.0.