I'm trying to make a choropleth map using pandas to read csv data. I followed a tutorial online, but didn't get my code to work.
Tutorial link: https://towardsdatascience.com/choropleth-maps-with-folium-1a5b8bcdd392. Here is the code i'm trying to get to work:
# CHOLOPLETH MAP
import json
kunnat_geo = r'kunnat.geojson'
coords = pd.read_csv('taulu2.csv')
map_cholo = folium.Map(location=[65,26], zoom_start=4, tiles='stamenwatercolor')
map_cholo.choropleth(
geo_data=kunnat_geo,
data=coords,
columns=['ALUE', 'MIELENTERVEYDEN KUNTOUTUSKOTIEN ASIAKKAAT VUONNA 2018'],
key_on='features.properties.Kunta',
fill_color='YlGnBu',
fill_opacity=1,
line_opacity=1,
legend_name='MIELENTERVEYDEN KUNTOUTUSKOTIEN ASIAKKAAT VUONNA 2018',
smooth_factor=0)
map_cholo
However it gives me an attribute error:
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-74-026c8c7bfd66> in <module>
14 line_opacity=1,
15 legend_name='MIELENTERVEYDEN KUNTOUTUSKOTIEN ASIAKKAAT VUONNA 2018',
---> 16 smooth_factor=0)
17
18 map_cholo
D:\Anaconda3\lib\site-packages\folium\folium.py in choropleth(self, *args, **kwargs)
416 )
417 from folium.features import Choropleth
--> 418 self.add_child(Choropleth(*args, **kwargs))
419
420 def keep_in_front(self, *args):
D:\Anaconda3\lib\site-packages\folium\features.py in __init__(self, geo_data, data, columns, key_on, bins, fill_color, nan_fill_color, fill_opacity, nan_fill_opacity, line_color, line_weight, line_opacity, name, legend_name, overlay, control, show, topojson, smooth_factor, highlight, **kwargs)
1249 style_function=style_function,
1250 smooth_factor=smooth_factor,
-> 1251 highlight_function=highlight_function if highlight else None)
1252
1253 self.add_child(self.geojson)
D:\Anaconda3\lib\site-packages\folium\features.py in __init__(self, data, style_function, highlight_function, name, overlay, control, show, smooth_factor, tooltip, embed, popup)
456 self.convert_to_feature_collection()
457 if self.style:
--> 458 self._validate_function(style_function, 'style_function')
459 self.style_function = style_function
460 self.style_map = {}
D:\Anaconda3\lib\site-packages\folium\features.py in _validate_function(self, func, name)
521 """
522 test_feature = self.data['features'][0]
--> 523 if not callable(func) or not isinstance(func(test_feature), dict):
524 raise ValueError('{} should be a function that accepts items from '
525 'data[\'features\'] and returns a dictionary.'
D:\Anaconda3\lib\site-packages\folium\features.py in style_function(x)
1223
1224 def style_function(x):
-> 1225 color, opacity = color_scale_fun(x)
1226 return {
1227 'weight': line_weight,
D:\Anaconda3\lib\site-packages\folium\features.py in color_scale_fun(x)
1204
1205 def color_scale_fun(x):
-> 1206 key_of_x = get_by_key(x, key_on)
1207 if key_of_x is None:
1208 raise ValueError("key_on `{!r}` not found in GeoJSON.".format(key_on))
D:\Anaconda3\lib\site-packages\folium\features.py in get_by_key(obj, key)
1201 return (obj.get(key, None) if len(key.split('.')) <= 1 else
1202 get_by_key(obj.get(key.split('.')[0], None),
-> 1203 '.'.join(key.split('.')[1:])))
1204
1205 def color_scale_fun(x):
D:\Anaconda3\lib\site-packages\folium\features.py in get_by_key(obj, key)
1200 def get_by_key(obj, key):
1201 return (obj.get(key, None) if len(key.split('.')) <= 1 else
-> 1202 get_by_key(obj.get(key.split('.')[0], None),
1203 '.'.join(key.split('.')[1:])))
1204
AttributeError: 'NoneType' object has no attribute 'get'
Here is the geojson file im using: https://raw.githubusercontent.com/varmais/maakunnat/master/kunnat.geojson
And the data: https://pastebin.com/SdEXDM89
The geojson you are using contains multiple flaws. Just an example, look at
{"id":49,"type":"Feature","geometry":{"coordinates":[[[[25.134789950981,65.0613390595066],[24.9509796014637,65.1411214235741],[24.1149334366251,65.1739425977789],[24.1374948169974,65.2416484128856],[24.6071512739822,65.211492673253],[25.2249108920834,65.2366422852267],[25.319454962569,65.2626286706296],[25.5524286749097,65.2529182323504],[25.6623616596278,65.260748036272],[25.7723806903971,65.2919894627541],[25.9132907485861,65.2931966157892],[26.0266782370841,65.2703735338041],[25.993210256336,65.1914324603082],[25.736352838218,65.2201254797071],[25.5637124399186,65.1919505955019],[25.635197316715,65.1390540421563],[25.6086182968484,65.0816350751541],[25.3775958184099,65.1070832092577],[25.2892903033333,65.0817828240486],[25.134789950981,65.0613390595066]]]],"type":"MultiPolygon"},"properties":{"nationalCode":84,"Country":"FI","name_fi":"Haukipudas","name_se":"Haukipudas"}}
It does not have Kunta in properties. This makes your geojson bad-formed. I suggest you to replace that geojson, or edit it as the very last resort.