id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
294852957,MDU6SXNzdWUyOTQ4NTI5NTc=,1892,Not able to save raster to netcdf ,5759776,closed,0,,,3,2018-02-06T17:49:15Z,2018-02-06T18:53:35Z,2018-02-06T18:51:31Z,NONE,,,,"Code Sample, a copy-pastable example if possible
```
# Your code here
import xarray as xr
rio = xr.open_rasterio(r'C:\DEV\B04_10m.tif')
print(rio)
rio.to_netcdf(r'C:\DEV\B04_10m.nc')
```
Problem description
my files are in unit16, I got the error messages:

```
Traceback (most recent call last):
ValueError: NetCDF 3 does not support type uint16
```

[this should explain why the current behavior is a problem and why the expected output is a better solution.]

Expected Output
It should be able to save tif to netcdf, is there some process missing here?

Output of xr.show_versions()

<details>

# Paste the output here xr.show_versions() here INSTALLED VERSIONS ------------------ commit: None python: 3.6.3.final.0 python-bits: 64 OS: Windows OS-release: 10 machine: AMD64 processor: Intel64 Family 6 Model 158 Stepping 9, GenuineIntel byteorder: little LC_ALL: None LANG: en LOCALE: None.None
xarray: 0.10.0
pandas: 0.22.0
numpy: 1.13.3
scipy: 1.0.0
netCDF4: None
h5netcdf: None
Nio: None
bottleneck: None
cyordereddict: None
dask: 0.16.1
matplotlib: 2.1.1
cartopy: 0.15.1
seaborn: None
setuptools: 36.5.0.post20170921
pip: 9.0.1
conda: None
pytest: None
IPython: 6.2.1
sphinx: 1.6.6

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