issue_comments: 407748105

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https://github.com/pydata/xarray/issues/2288#issuecomment-407748105 https://api.github.com/repos/pydata/xarray/issues/2288 407748105 MDEyOklzc3VlQ29tbWVudDQwNzc0ODEwNQ== 8699967 2018-07-25T13:08:25Z 2018-07-25T13:08:25Z CONTRIBUTOR

It is not in the dimension, it is the coordinate attribute in the variable. That is handled automatically by xarray when writing to_netcdf if you add the crs to the coords.

From the ncdump: ``` dimensions: x = 65 ; y = 31 ; variables: double x(x) ; x:_FillValue = NaN ; x:long_name = "x coordinate of projection" ; x:standard_name = "projection_x_coordinate" ; x:units = "m" ; double y(y) ; y:_FillValue = NaN ; y:long_name = "y coordinate of projection" ; y:standard_name = "projection_y_coordinate" ; y:units = "m" ; int64 time ; time:units = "seconds since 2015-04-03T17:55:19" ; time:calendar = "proleptic_gregorian" ; int64 spatial_ref ; spatial_ref:spatial_ref = "PROJCS[\"UTM Zone 15, Northern Hemisphere\",GEOGCS[\"WGS 84\",DATUM[\"WGS_1984\",SPHEROID[\"WGS 84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY[\"EPSG\",\"6326\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],AUTHORITY[\"EPSG\",\"4326\"]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"latitude_of_origin\",0],PARAMETER[\"central_meridian\",-93],PARAMETER[\"scale_factor\",0.9996],PARAMETER[\"false_easting\",500000],PARAMETER[\"false_northing\",0],UNIT[\"Meter\",1]]" ; double ndvi(y, x) ; ndvi:_FillValue = NaN ; ndvi:grid_mapping = "spatial_ref" ; ndvi:coordinates = "spatial_ref time" ;

// global attributes: :creation_date = "2018-04-11 13:14:55.401183" ; ```

It would definitely be a good idea to ensure that the crs variable is a coordinate, so I agree that having support for that would be a good idea.

 
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