Python folium GeoJSON map not displaying

问题

Good afternoon,

I'm trying to use a combination of geopandas, pandas and folium to create a polygon map that I can embed incorporate into a web page.

For some reason, it's not displaying and wonder if anyone can help.

The steps I've taken:

1) Grabbed a .shp from the UK's OS for Parliamentary boundaries.

2) I've then used geopandas to change the projection to epsg=4326 and then exported as GeoJSON which takes the following format:

 { "type": "Feature", "properties": { "PCON13CD": "E14000532", "PCON13CDO": "A03", "PCON13NM": "Altrincham and Sale West" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -2.313999519326579, 53.357408280545918 ], [ -2.313941776174758, 53.358341455420039 ], [ -2.31519699483377, 53.359035664493433 ], [ -2.317953152796459, 53.359102954309151 ], [ -2.319855973429864, 53.358581917200119 ],... ] ] ] } },...

Then what I'd like to do is mesh this with a dataframe of constituencies in the following format, dty:

constituency        count
0   Burton          667
1   Cannock Chase   595
2   Cheltenham      22
3   Cheshire East   2
4   Congleton       1
5   Derbyshire Dales    1
6   East Staffordshire  4

import folium
mapf = folium.Map(width=700, height=370, tiles = "Stamen Toner", zoom_start=8, location=     ["53.0219392","-2.1597434"])


mapf.geo_json(geo_path="geo_json_shape2.json", 
              data_out="data.json", 
              data=dty, 
              columns=["constituency","count"], 
              key_on="feature.properties.PCON13NM.geometry.type.Polygon",
              fill_color='PuRd',
              fill_opacity=0.7, 
              line_opacity=0.2, 
              reset="True")

The output from mapf looks like:

mapf.json_data

{'../../Crime_data/staffs_data92.json': [{'Burton': 667,
   'Cannock Chase': 595,
   'Cheltenham': 22,
   'Cheshire East': 2,
   'Congleton': 1,
   'Derbyshire Dales': 1,
   'East Staffordshire': 4,
   'Lichfield': 438,
   'Newcastle-under-Lyme': 543,
   'North Warwickshire': 1,
   'Shropshire': 17,
   'South Staffordshire': 358,
   'Stafford': 623,
   'Staffordshire Moorlands': 359,
   'Stoke-on-Trent Central': 1053,
   'Stoke-on-Trent North': 921,
   'Stoke-on-Trent South': 766,
   'Stone': 270,
   'Tamworth': 600,
   'Walsall': 1}]}

Although the mapf.create_map() function successfully creates a map, the polygons don't render.

Can anyone suggest any debugging steps?

I'm never clear on how to add the full data files if anyone needs them, so please let me know.

Thank you for your time in advance.

回答1:

@elksie5000, Try mplleaflet it is extremely straightforward.

pip install mplleaflet

in Jupyter/Ipython notebook:

import mplleaflet
ax = geopandas_df.plot(column='variable_to_plot', scheme='QUANTILES', k=9, colormap='YlOrRd')
mplleaflet.show(fig=ax.figure)

来源：https://stackoverflow.com/questions/26655531/python-folium-geojson-map-not-displaying

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