Basemap hack for folks that are having issues with Conda

[Scott Collis]

See the discussion here:

https://github.com/conda-forge/basemap-feedstock/issues/30

Py-ART has a required dependency of Basemap. This is going away real soon as Basemap will be out of support in 2020

If you get the key error add:

os.environ['PROJ_LIB'] = ‘/PATH_TO_ANANCONDA_ENV/share/proj/‘

Eg 

os.environ['PROJ_LIB'] = '/home/scollis/anaconda3/envs/dasktestj/share/proj/‘

For those that are using Py-ART in Dask (hint: the new Dask JobQueue makes it easier than ever working on a cluster) here is an example how you can execute this on all nodes

—

cluster = PBSCluster(processes = 18)

cluster.scale(4)         # Ask for 4*18 workers

client = Client(cluster)  # Connect this local process to remote workers

def com():

    os.environ['PROJ_LIB'] = '/home/scollis/anaconda3/envs/dasktestj/share/proj/'

    from mpl_toolkits.basemap import Basemap

    return os.environ['PROJ_LIB']

client.run(com)

—

I hope this helps any heartache.

If you use Basemap it is now time to learn Cartopy.

Scott Collis

[Mariana Scott]

I installed pyart following these instructions: https://github.com/ARM-DOE/pyart/wiki/Simple-Install-of-Py-ART-using-Anaconda  (Conda 4.6.7) on a Windows 10 computer (python 3.6.7) and am getting the KeyError: 'PROJ_LIB' when executing import pyart on Spyder..

Could you give any more information about how you fixed this? Where would I add os.environ['PROJ_LIB'] = ... command?

also, is "/share/proj/" supposed to be contained in that path? is this the "envs directories" when I do a conda info?

Thanks,

Mariana

[Scott Collis]

Hey Mariana,

We have all kinds of issues with basemap at the moment.

Are you using basemap for radial or grid displays?

 

If the latter I highly encourage you to use X-array and cartopy. Cc-ing in Jason who has recently done some X-Array work for our mapped moments.. He can help. If radial plots, would suggest now is the time to explore cartopy. MPL end of life is coming up quick

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[Mahdi Shadkam-Farrokhi]

Finally, a solution that worked!

Also, the location to add the line 

os.environ['PROJ_LIB'] = ‘/PATH_TO_ANANCONDA_ENV/share/proj/'

is in ...\Anaconda3\Lib\site-packages\mpl_toolkits\basemap\__init__.py

Should be around line 155 and looks like this:

Notice I had to change the path mentioned in the post to Library/share. This was the only way I could get it to work since the 'epsg' file is also there (line 159).

I tried a bunch of stuff before this, including adding a new environment, updating pip, etc. so can't be sure exactly if those things helped.