title: Intersection between 2 Geodataframe
body: <p>I am doing some work on the Geopanda library, I have a shapefile with polygons and data on a excel sheet that I transform into points. I want to intersect the two DataFrames and export it to a file. I use also on both projections (WGS84) so that I can compare them.
  There should be at least some points that intersects the polygons.
  My intersect GeoSeries does not give me any points that fit into the polygon, but I don't see why...</p>
  
  <p>I checked if the unit of the shapefile was really Kilometer and not somthing else. I am not proficient into GeoPlot so I can't really make sure what the GeoDataFrame look like.</p>
  
  <pre><code>f = pd.read_excel(io = 'C:\\Users\\peilj\\meteo_sites.xlsx')
  
  #Converting panda dataframe into a GeoDataFrame with CRS projection
  geometry = [Point(xy) for xy in zip(df.geoBreite, df.geoLaenge)]
  df = df.drop(['geoBreite', 'geoLaenge'], axis=1)
  crs = "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs"
  gdf = GeoDataFrame(df, crs=crs, geometry=geometry)
  
  #Reading shapefile and creating buffer
  gdfBuffer = geopandas.read_file(filename = 'C:\\Users\\peilj\\lkr_vallanUTM.shp')
  gdfBuffer = gdfBuffer.buffer(100) #When the unit is kilometer
  
  #Converting positions long/lat into shapely object
  gdfBuffer = gdfBuffer.to_crs("+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs")
  
  #Intersection coordonates from polygon Buffer and points of stations
  gdf['intersection'] = gdf.geometry.intersects(gdfBuffer)
  #Problem: DOES NOT FIND ANY POINTS INSIDE STATIONS !!!!!!!
  
  #Giving CRS projection to the intersect GeoDataframe
  gdf_final = gdf.to_crs("+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs")
  gdf_final['intersection'] = gdf_final['intersection'].astype(int) #Shapefile does not accept bool
  
  #Exporting to a file
  gdf_final.to_file(driver='ESRI Shapefile', filename=r'C:\\GIS\\dwd_stationen.shp
  
  </code></pre>
  
  <p>The files needed: 
  <a href="https://drive.google.com/open?id=11x55aNxPOdJVKDzRWLqrI3S_ExwbqCE9" rel="nofollow noreferrer">https://drive.google.com/open?id=11x55aNxPOdJVKDzRWLqrI3S_ExwbqCE9</a></p>