GeoPandas Set CRS on Points

Question

Given the following GeoDataFrame:

h=pd.DataFrame({\'zip\':[19152,19047],
               \'Lat\':[40.058841,40.202162],
               \'Lon\':[-75.042164,-74         


        

Answer 1

Geopandas API got cleaned up, and now works without surprises. Make sure to use the lastest stable version and read the docs.

Setting the CRS on a GeoDataFrame using its EPSG code is as simple as

gdf.set_crs(epsg=4326, inplace=True)

where gdf is a geopandas.geodataframe.GeoDataFrame. Watch out for the explicit inplace!

So in the example above it would be:

import pandas as pd
from shapely.geometry import Point
from geopandas import GeoDataFrame

df = pd.DataFrame({'zip':[19152,19047],
               'Lat':[40.058841,40.202162],
               'Lon':[-75.042164,-74.924594]})

geometry = [Point(xy) for xy in zip(h.Lon, h.Lat)]
gdf = GeoDataFrame(df, geometry=geometry)

gdf.set_crs(epsg=4326, inplace=True)
# ^ comment out to get a "Cannot transform naive geometries" error below

# project to merkator
gdf.to_crs(epsg=3395)

     zip        Lat        Lon                          geometry
0  19152  40.058841 -75.042164  POINT (-8353655.485 4846992.030)
1  19047  40.202162 -74.924594  POINT (-8340567.652 4867777.107)