KeyError 'PROJ_LIB'

[statiksof]

In the notebook BinderNotebook Executing

from mpl_toolkits.basemap import Basemap
import matplotlib.pyplot as plt
import numpy as np

returns:

---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<ipython-input-23-212c45f90d40> in <module>()
----> 1 from mpl_toolkits.basemap import Basemap
      2 #import matplotlib.pyplot as plt
      3 import numpy as np

/srv/conda/lib/python3.6/site-packages/mpl_toolkits/basemap/__init__.py in <module>()
    144 
    145 # create dictionary that maps epsg codes to Basemap kwargs.
--> 146 pyproj_datadir = os.environ['PROJ_LIB']
    147 epsgf = open(os.path.join(pyproj_datadir,'epsg'))
    148 epsg_dict={}

/srv/conda/lib/python3.6/os.py in __getitem__(self, key)
    667         except KeyError:
    668             # raise KeyError with the original key value
--> 669             raise KeyError(key) from None
    670         return self.decodevalue(value)
    671 

KeyError: 'PROJ_LIB'

[gaswani]

I am having the same issue:
KeyError Traceback (most recent call last)
in ()
9 from matplotlib.patches import Polygon
10 from matplotlib.collections import PatchCollection
---> 11 from mpl_toolkits.basemap import Basemap
12 from scipy import stats
13 import matplotlib.patches as mpatches

~/anaconda3/lib/python3.6/site-packages/mpl_toolkits/basemap/init.py in ()
153
154 # create dictionary that maps epsg codes to Basemap kwargs.
--> 155 pyproj_datadir = os.environ['PROJ_LIB']
156 epsgf = open(os.path.join(pyproj_datadir,'epsg'))
157 epsg_dict={}

~/anaconda3/lib/python3.6/os.py in getitem(self, key)
667 except KeyError:
668 # raise KeyError with the original key value
--> 669 raise KeyError(key) from None
670 return self.decodevalue(value)
671

KeyError: 'PROJ_LIB'

Anyone out there with an idea of how to resolve this problem?

[martinchristen]

This is a bug that happens with BaseMap (see [https://github.com/matplotlib/basemap/issues/419])

I fixed it on my Linux machine by installing:

conda install -c conda-forge basemap-data-hires

In future I'm not using BaseMap anymore, there are just too many problems. I switched to cartopy ( https://scitools.org.uk/cartopy/docs/v0.16/ ).

Next week I will have a talk at pycon.de and I will provide an updated notebook using cartopy (in a new repository called PyConDE2018). And at some point, I'll upgrade this notebook too.

[joefutrelle]

@martinchristen interesting, I tried that on my Linux machine with no luck. Maybe this is another version-sensitive issue?

[statiksof]

@joefutrelle I opened this issue (conda-forge/basemap-feedstock#30) a month a ago. Maybe you find something interesting for your case.

[martinchristen]

@joefutrelle I checked the history on my Linux machine and I actually did the following:

conda remove basemap
conda install -c conda-forge basemap-data-hires:1.1.0-0

But as I mentioned, I moved away from basemap and I'm using cartopy now which is available using

conda install cartopy

[gaswani]

I managed to find a solution to this error. I found the solution at https://conda-forge.org/

In the bash terminal I first typed :

$ conda config --add channels conda-forge

Followed by:

$ conda install basemap

I thereafter ran my script in Juptyer notebook and the error was gone. I was able to plot the Chloropeth map of the world.

[jaecheverrip]

this was the only way i had to resolve the KeyError 'PROJ_LIB', using this : https://gist.github.com/junzis/36fee36acd7cadfdf1c01c06d97f4947

[ReimarBauer]

Please use a conda environment. The PROJ_LIB is set if you are not do everything in the base environment. The base environment is to host the packages for creating and managing envs.
A rather complete discussions is on
conda-forge/pyproj-feedstock#17
conda-forge/basemap-feedstock#30

if you don't use a conda environment you have to set the env var and path yourself. Just search on the discussion about this

conda install -c conda-forge proj4
export PROJ_LIB=$CONDA_PREFIX/share/proj

[sarimurrab]

In the notebook BinderNotebook Executing

from mpl_toolkits.basemap import Basemap
import matplotlib.pyplot as plt
import numpy as np

returns:

---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<ipython-input-23-212c45f90d40> in <module>()
----> 1 from mpl_toolkits.basemap import Basemap
      2 #import matplotlib.pyplot as plt
      3 import numpy as np

/srv/conda/lib/python3.6/site-packages/mpl_toolkits/basemap/__init__.py in <module>()
    144 
    145 # create dictionary that maps epsg codes to Basemap kwargs.
--> 146 pyproj_datadir = os.environ['PROJ_LIB']
    147 epsgf = open(os.path.join(pyproj_datadir,'epsg'))
    148 epsg_dict={}

/srv/conda/lib/python3.6/os.py in __getitem__(self, key)
    667         except KeyError:
    668             # raise KeyError with the original key value
--> 669             raise KeyError(key) from None
    670         return self.decodevalue(value)
    671 

KeyError: 'PROJ_LIB'

This gonna work for sure, but just check where is your Anaconda Path up to share folder(WINDOWS)

import os
os.environ["PROJ_LIB"] = "C:\\Users\\SARIM\\Anaconda3\\Library\\share"; 
from mpl_toolkits.basemap import Basemap