title: GeoJSON file not being rendered using Folium
body: <p>I am trying to create a choropleth map using Folium. I exported a GeoJSON file for London boroughs from an official GIS shapefile. After hours of researching about possible causes, I noticed in my file that the features come up in a different order compared to another GeoJSON file that works, which I assume is the reason for not appearing on the map. Basically the order in mine is something like</p>
  
  <pre><code>"features": [ 
      "geometry": {...}, 
      "properties": {...}, etc  
  </code></pre>
  
  <p>and the working GeoJSON has</p>
  
  <pre><code>"features": [ 
     "properties": {...},
     "geometry": {...},  
  </code></pre>
  
  <p>My question is How can I change the order of the features or how to make it render with Folium?</p>
  
  <p>The code for creating the map is as follows:</p>
  
  <pre><code>london = r'london_simple.json' # geojson file
  # create a plain London map
  london_map = folium.Map(location=[51.5074, 0.1278], zoom_start=10)
  
  london_map.choropleth(
     geo_data = london,
     data = dfl1,
     columns = ['Area_name', 'GLA_Population_Estimate_2017'],
     key_on='feature.properties.Counties_1',
     fill_color = 'YlOrRd',
     fill_opacity = 0.7,
     line_opacity=0.2,
     legend_name='Population size in London'
     )
  london_map
  </code></pre>
  
  <p>I'm working in a jupyter notebook on IBM Watson, if that makes any difference. If I use my geojson file, no choropleth regions appear. If I change to the other file, it works (provided I change the map coordinates to Toronto ([37.7749, -122.4194]).</p>
  
  <p>My code doesn't generate any error, just the plain map focused on London without the choropleth regions.</p>
  
  <p><a href="https://github.com/adrianturculet/Coursera_Capstone/blob/master/sanfran.json" rel="nofollow noreferrer">Link to working geojson</a></p>
  
  <p><a href="https://github.com/adrianturculet/Coursera_Capstone/blob/master/london_simple.json" rel="nofollow noreferrer">Link to my problematic geojson</a></p>