Choropleth#
Example#
import ipyleaflet
import json
import pandas as pd
import os
import requests
from ipywidgets import link, FloatSlider
from branca.colormap import linear
def load_data(url, filename, file_type):
r = requests.get(url)
with open(filename, 'w') as f:
f.write(r.content.decode("utf-8"))
with open(filename, 'r') as f:
return file_type(f)
geo_json_data = load_data(
'https://raw.githubusercontent.com/jupyter-widgets/ipyleaflet/master/examples/us-states.json',
'us-states.json',
json.load)
unemployment = load_data(
'https://raw.githubusercontent.com/jupyter-widgets/ipyleaflet/master/examples/US_Unemployment_Oct2012.csv',
'US_Unemployment_Oct2012.csv',
pd.read_csv)
unemployment = dict(zip(unemployment['State'].tolist(), unemployment['Unemployment'].tolist()))
layer = ipyleaflet.Choropleth(
geo_data=geo_json_data,
choro_data=unemployment,
colormap=linear.YlOrRd_04,
border_color='black',
style={'fillOpacity': 0.8, 'dashArray': '5, 5'})
m = ipyleaflet.Map(center = (43,-100), zoom = 4)
m.add_layer(layer)
m
Usage#
The Choropleth takes geo_data and choro_data as arguments.
The geo_data is a GeoJSON dictionary, for instance :
{
"type": "FeatureCollection",
"features":[{
"type":"Feature",
"id":"AL",
"properties":{"name":"Alabama"},
"geometry":{
"type":"Polygon",
"coordinates": [[[-87.359296,35.00118]]] ...
}
}]
}
The choro_data is a dictionary that maps an key to a float value, in order to build the colormap :
{'AL': 7.1,
'AK': 6.8}
The Choropleth layer is then created specifying on which key the colormap is applied:
Choropleth(
geo_data=geo_data,
choro_data=choro_data,
key_on='id'
)
Attributes#
- class ipyleaflet.leaflet.Choropleth(**kwargs)[source]#
Choropleth class, with GeoJSON as parent class.
Layer showing a Choropleth effect on a GeoJSON structure.
- geo_data#
The GeoJSON structure on which to apply the Choropleth effect.
- Type
dict, default None
- choro_data#
Data used for building the Choropleth effect.
- Type
dict, default None
- value_min#
Minimum data value for the color mapping.
- Type
float, default None
- value_max#
Maximum data value for the color mapping.
- Type
float, default None
- colormap#
The colormap used for the effect.
- Type
branca.colormap.ColorMap instance, default None
- key_on#
The feature key to use for the colormap effect.
- Type
string, default “id”