CODEWITHSUNDEEP
projectionshapefilegeopandas
user2905280
user2905280

Reputation: 47

importing shapefile to geopandas using read_file(); can't print crs or reproject

I have a shapefile of historical county boundaries with a valid .prj file. I can open it in ArcGIS and find that the projection is USA Contiguous Albers Equal Area Conic. I can also plot the shapefile after I have read it into geopandas and the projection looks correct.

However, I can't print the name of the coordinate system in my Python IDE.

If you read in the built in data from geopandas

world = gpd.read_file(gpd.datasets.get_path('naturalearth_lowres'))

and then run

print(world.crs)

you get

{'init': 'epsg:4326'}

But if I run

counties1910 = gpd.read_file('counties1910.shp')

print(counties1910.crs)

all I get is

{}

Additionally, I have found that while I can manually run

counties1910.crs = {'init' :'epsg:102003'}

without an error, I do get an error if I try to reproject counties1910:

counties1910 = counties1910.to_crs("EPSG:4326")

--------------------------------------------------------------------------
CRSError                                  Traceback (most recent call last)
<ipython-input-148-4aa2873c2f22> in <module>
----> 1 counties1910 = counties1910.to_crs("EPSG:4326")

~\AppData\Local\Continuum\anaconda3\lib\site-packages\geopandas\geodataframe.py in to_crs(self, crs, epsg, inplace)
    532         else:
    533             df = self.copy()
--> 534         geom = df.geometry.to_crs(crs=crs, epsg=epsg)
    535         df.geometry = geom
    536         df.crs = geom.crs

~\AppData\Local\Continuum\anaconda3\lib\site-packages\geopandas\geoseries.py in to_crs(self, crs, epsg)
    408         # skip transformation if the input CRS and output CRS are the exact same
    409         if _PYPROJ_VERSION >= LooseVersion("2.1.2") and pyproj.CRS.from_user_input(
--> 410             self.crs
    411         ).is_exact_same(pyproj.CRS.from_user_input(crs)):
    412             return self

~\AppData\Local\Continuum\anaconda3\lib\site-packages\pyproj\crs\crs.py in from_user_input(value, **kwargs)
    438         if isinstance(value, CRS):
    439             return value
--> 440         return CRS(value, **kwargs)
    441 
    442     def get_geod(self) -> Optional[Geod]:

~\AppData\Local\Continuum\anaconda3\lib\site-packages\pyproj\crs\crs.py in __init__(self, projparams, **kwargs)
    294             projstring = _prepare_from_string(" ".join((projstring, projkwargs)))
    295 
--> 296         super().__init__(projstring)
    297 
    298     @staticmethod

pyproj/_crs.pyx in pyproj._crs._CRS.__init__()

CRSError: Invalid projection: +init=epsg:102003 +type=crs: (Internal Proj Error: proj_create: crs not found)

What am I missing?

Thanks!

Upvotes: 0

Views: 1604

Answers (1)

martinfleis
martinfleis

Reputation: 7804

USA Contiguous Albers Equal Area Conic is ESRI:102003. Because you are using old version of GeoPandas and pyproj, it does not automatically pick it.

Because you are passing it as EPSG:102003, not ESRI, it raises that error.

This should work as intended in GeoPandas 0.7.0 and 0.8.0, which uses pyproj.CRS class to store projection information. You will ideally fix it by updating to the latest release (0.8.0).

Alternatively, pass CRS as ESRI (but recommended is an update, if possible).

counties1910.crs = {'esri:102003'}

Upvotes: 2

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