Choropleth Layer

Choropleth is an here-map-widget-for-jupyter class that allows you to generate a Choropleth Map for your data.

Example

import here_map_widget
import json
import pandas as pd
import os
import requests
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 = here_map_widget.Choropleth(
    geo_data=geo_json_data,
    choro_data=unemployment,
    colormap=linear.YlOrRd_04,
)

m = here_map_widget.Map(api_key=os.environ["LS_API_KEY"], center=[43, -100], zoom=4)
m.add_layer(layer)
m

Attributes

Attribute	Type	Doc
geo_data	dict	The GeoJSON structure on which to apply the Choropleth effect
choro_data	dict	Data used for building the Choropleth effect
value_min	float	Minimum data value for the color mapping
value_max	float	Maximum data value for the color mapping
colormap	branca.colormap.ColorMap	The colormap used for the effect
key_on	string	The feature key to use for the colormap effect, default value is id.
style	dict	The style to use for rendering GeoJSON data. Example: {‘fillColor’: ‘rgba(245, 176, 65, 0.5)’, ‘strokeColor’: ‘black’, ‘lineWidth’: 10, ‘lineCap’: ‘square’, lineJoin: ‘bevel’}
hover_style	dict	The style to use for rendering data when hovered over. Example: {‘fillColor’: ‘rgba(245, 176, 65, 0.5)’, ‘strokeColor’: ‘black’, ‘lineWidth’: 10}
disable_legacy_mode	boolean	Disable legacy mode for parsing GeoJSON data default True
evt_type	string	Event type to be used to apply hover_style, please check allowed values, default value is tap.
show_bubble	boolean	To determine whether to show info bubble for space data or not
style_callback	Callable object	A callback function which is called for each feature to generate style for the feature
point_style	dict	The style to use for rendering Points in GeoJSON if not provided default Markers will be used. Example: {“strokeColor”: ‘white’, “lineWidth”: 1, “fillColor”: “#1b468d”, “fillOpacity”: 0.7, “radius”: 5}, radius should be between 2 to 8.