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  • uint32 variable in zarr, but float64 when loading with xarray · 1 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
822300379 https://github.com/pydata/xarray/issues/4311#issuecomment-822300379 https://api.github.com/repos/pydata/xarray/issues/4311 MDEyOklzc3VlQ29tbWVudDgyMjMwMDM3OQ== ludwigVonKoopa 49512274 2021-04-19T08:59:27Z 2021-04-19T08:59:27Z NONE

Problem found.

Another example with more minimalistic code :

```python zname = '/tmp/test.zarr' zh = zarr.open(zname, "w")

data = np.ones(10, dtype=np.uint32) za = zh.array("example", data) za.attrs["_ARRAY_DIMENSIONS"] = ["obs"] # or won't be read by xarray

print("zarr : ", za.dtype, za[:])

ds = xr.open_zarr(zname) print("xarray : ", ds.example.dtype, ds.example.values) python

zarr : uint32 [1 1 1 1 1 1 1 1 1 1] xarray : float64 [1. 1. 1. 1. 1. 1. 1. 1. 1. 1.] ```

After investigations, i found that you have to explicitly pass fill_value=None :

```python zname = '/tmp/test.zarr' zh = zarr.open(zname, "w")

data = np.ones(10, dtype=np.uint32) za = zh.array("example", data, fill_value=None) # <-- default fill_value=0

za.attrs["_ARRAY_DIMENSIONS"] = ["obs"] print("zarr : ", za.dtype, za[:])

ds = xr.open_zarr(zname) print("xarray : ", ds.example.dtype, ds.example.values) python

zarr : uint32 [1 1 1 1 1 1 1 1 1 1] xarray : uint32 [1 1 1 1 1 1 1 1 1 1] ```

 
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   uint32 variable in zarr, but float64 when loading with xarray 673504545

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