How to draw a scatter plot with folium¶

In [1]:

import numpy as np
import sys
sys.path.insert(0, 'folium')
sys.path.insert(0, 'branca')

import branca
import folium

We create a sample of data thanks to numpy.

In [2]:

n = 100
lats = np.random.uniform(38, 53, n)
lngs = np.random.uniform(-17, 23, n)
sizes = np.random.uniform(2, 20, n)
colors = np.random.uniform(0, 50, n)

We create a colormap thanks to branca. You can also create your own function or use matplotlib.

In [3]:

cm = branca.colormap.LinearColormap(['green', 'yellow', 'red'], vmin=0, vmax=50)
print(cm(25))
cm

#ffff00

Out[3]:

We create a FeatureGroup with all the points.

In [4]:

f = folium.map.FeatureGroup()

for lat, lng, size, color in zip(lats, lngs, sizes, colors):
    f.add_child(
        folium.features.CircleMarker(
            [lat, lng],
            radius=size,
            color=None,
            fill_color=cm(color),
            fill_opacity=0.6)
        )

And draw the map !

In [5]:

m = folium.Map([46,4], zoom_start=5, tiles='mapquestopen')
m.add_child(f)

Out[5]:

That's all folks !