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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _open_xarray_dataset(self, val, chunks=CHUNK_SIZE):
 """Read the band in blocks."""

        dask_arr = from_sds(val, chunks=chunks)
        attrs = val.attributes()
        return xr.DataArray(dask_arr, dims=('y', 'x'),
                            attrs=attrs)