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  • can't save wrf Mercator projection attribute to new netcdf file · 3 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
400405964 https://github.com/pydata/xarray/issues/2252#issuecomment-400405964 https://api.github.com/repos/pydata/xarray/issues/2252 MDEyOklzc3VlQ29tbWVudDQwMDQwNTk2NA== fmaussion 10050469 2018-06-26T17:53:28Z 2018-06-26T17:53:28Z MEMBER

Note that the XLAT XLON coordinates of WRF files are not sufficient to retrieve the WRF projection in the current format of your dataset.

wrf-python or salem need the original dataset attributes to parse the projection information (STAND_LON, TRUELAT1 & 2, etc). wrf-python should probably store their projection as a string rather than an object, though.

(more infos about wrf projections)

 
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   can't save wrf Mercator projection attribute to new netcdf file 335640601
400165276 https://github.com/pydata/xarray/issues/2252#issuecomment-400165276 https://api.github.com/repos/pydata/xarray/issues/2252 MDEyOklzc3VlQ29tbWVudDQwMDE2NTI3Ng== morganeoneill 1971123 2018-06-26T03:20:26Z 2018-06-26T03:20:26Z NONE

Excellent, that's so simple! I don't know what I'd need it for, and I certainly don't need it for cursorily zooming around in ncview. Thanks a lot @darothen-cc, you're wicked fast!

 
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   can't save wrf Mercator projection attribute to new netcdf file 335640601
400164831 https://github.com/pydata/xarray/issues/2252#issuecomment-400164831 https://api.github.com/repos/pydata/xarray/issues/2252 MDEyOklzc3VlQ29tbWVudDQwMDE2NDgzMQ== darothen-cc 30631520 2018-06-26T03:17:07Z 2018-06-26T03:17:07Z NONE

Hi @morganeoneill, welcome to the world of xarray!

It looks like when you create the xarray Dataset, the "projection" attribute on pvo is being set as some sort of object, and the netCDF engine doesn't know how to write it to a file. I'm not familiar with wrf-python, so maybe it's a special map projection object that the package uses internally for some sort of plotting or other function?

Regardless, the easiest solution is just to drop that attribute. You can try something like

python del dataset['pvo'].attrs['projection']

Since your dataset has 2D coordinates for longitude and latitude (XLONG and XLAT), you may not need that projection information for anything. If it's something you definitely need to keep, you may want to try to decode the wrf-python 'Mercator' object into a string or something else - strings are totally fine to save as attributes on Datasets or DataArrays, and should serialize to NetCDF without any problem.

 
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   can't save wrf Mercator projection attribute to new netcdf file 335640601

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