issue_comments: 1486870845

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html_url issue_url id node_id user created_at updated_at author_association body reactions performed_via_github_app issue
https://github.com/pydata/xarray/issues/7691#issuecomment-1486870845 https://api.github.com/repos/pydata/xarray/issues/7691 1486870845 IC_kwDOAMm_X85Yn9k9 5821660 2023-03-28T13:16:31Z 2023-03-28T13:31:46Z MEMBER

MCVE:

python fname = "test-7691.nc" import netCDF4 as nc with nc.Dataset(fname, "w") as ds0: ds0.createDimension("t", 5) ds0.createVariable("x", "int16", ("t",), fill_value=-32767) v = ds0.variables["x"] v.set_auto_maskandscale(False) v.add_offset = 278.297319296597 v.scale_factor = 1.16753614203674e-05 v[:] = np.array([-32768, -32767, -32766, 32767, 0]) with nc.Dataset(fname) as ds1: x1 = ds1["x"][:] print("netCDF4-python:", x1.dtype, x1) with xr.open_dataset(fname) as ds2: x2 = ds2["x"].values ds2.to_netcdf("test-7691-01.nc") print("xarray first read:", x2.dtype, x2) with xr.open_dataset("test-7691-01.nc") as ds3: x3 = ds3["x"].values print("xarray roundtrip:", x3.dtype, x3)

python netCDF4-python: float64 [277.9147410535744 -- 277.9147644042972 278.67988586425815 278.297319296597] xarray first read: float32 [277.91476 nan 277.91476 278.6799 278.29733] xarray roundtrip: float32 [ nan nan nan 278.6799 278.29733] I've confirmed that correctly promoting to float64 in CFMaskCoder solves this issue.

 
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