CODEWITHSUNDEEP
pythonjsonnumpyfolium
Grace Park
Grace Park

Reputation: 1

Chropleth map isn't showing what I want

threshold_scale = np.linspace(df_value_counts['Count'].min(),
                              df_value_counts['Count'].max(),
                              6, dtype=int)
threshold_scale = threshold_scale.tolist() 
threshold_scale[-1] = threshold_scale[-1] + 1 

sf_map.choropleth(
    geo_data=sf_geo,
    data=df_value_counts,
    columns=['Neighborhood', 'Count'],
    key_on='feature.properties.name',
    fill_color='YlOrRd', 
    fill_opacity=0.7, 
    line_opacity=0.2,
    threshold_scale=threshold_scale,
    legend_name='Crime Rate in San Francisco')
sf_map

and I get an image like this: enter image description here

but I need to have an image like this: enter image description here

Upvotes: 0

Views: 1029

Answers (1)

e.net
e.net

Reputation: 21

the issue is in key_on='feature.properties.name'

should be key_on='feature.properties.DISTRICT'

look at the JSON file and see where the lat/long coordinates are mapped to. In the world map example, in its JSON file it was 'name' but in san fransico it is 'DISCTRICT' 

# download countries geojson file
!wget --quiet https://cocl.us/sanfran_geojson -O san_francisco_nh.json

print('GeoJSON file downloaded!')

sf_geo = r'san_francisco_nh.json'

sanfran_map.choropleth(
    geo_data=sf_geo,
    data=nh_countindex,
    columns=['Neighborhood','Count'],
    key_on='feature.properties.DISTRICT',
    fill_color='YlOrRd',
    fill_opacity=0.7,
    line_opacity=0.2,
    legend_name="Neighborhood Crime"
)

sanfran_map

san fransico choropleth map

Upvotes: 1

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