Setting a color using an attribute, folium, python dataframe

Question

I would like CircleMarker to set the color using an argument, is there such a possibility? I have dataframe something like this below:

lon     lat  segment
ABMF00GLP  -61.528  16.262       41
ABPO00MDG   47.229 -19.018       71
ACRG00GHA   -0.207   5.641       16
AGGO00ARG  -58.140 -34.874        4
AIRA00JPN  130.600  31.824       20
...            ...     ...      ...
YKRO00CIV   -5.240   6.871       16
ZAMB00ZMB   28.311 -15.426       90
ZECK00RUS   41.565  43.788       67
ZIM200CHE    7.465  46.877       81
ZIM300CHE    7.465  46.877       81

I can add markers with the same color like below, unfortunately I don’t know how to make it segment dependent.

for x in df.index:
    folium.CircleMarker(list(np.array(df.loc[x])),
                      popup=x,
                      radius=3,
                      color = "red",
                      ).add_to(m)

Asked By: babel113

||

Source

Answer 1

Introduce a continuous colormap and set minimum and maximum values in segment columns. Takes a segment value as an argument in the marker color setting. See this for more information about colormaps.

import pandas as pd
import numpy as np
import io
import folium
import branca.colormap as cm

data = '''
id lon     lat  segment
ABMF00GLP  -61.528  16.262       41
ABPO00MDG   47.229 -19.018       71
ACRG00GHA   -0.207   5.641       16
AGGO00ARG  -58.140 -34.874        4
AIRA00JPN  130.600  31.824       20
YKRO00CIV   -5.240   6.871       16
ZAMB00ZMB   28.311 -15.426       90
ZECK00RUS   41.565  43.788       67
ZIM200CHE    7.465  46.877       81
'''

df = pd.read_csv(io.StringIO(data), delim_whitespace=True)

linear = cm.LinearColormap(["green", "yellow", "red"], vmin=df['segment'].min(), vmax=df['segment'].max())

m = folium.Map([df['lat'].mean(), df['lon'].mean()], tiles="cartodbpositron", zoom_start=2)

for _, row in df.iterrows():
    folium.CircleMarker([row.lat, row.lon],
                      popup=row.id,
                      radius=3,
                      color = linear(row.segment),
                      ).add_to(m)

m

Answered By: r-beginners

Answer 2

Geopandas has very useful interactive mapping. When you call this method on geopandas dataframe, it will return folium map instance.

For you to use color the markers based on the segment value, simply do:

df.explore(
     column='segment')

Please note that you dataframe has to be geopandas dataframe, not just pandas dataframe.

Answered By: Jakub

Setting a color using an attribute, folium, python dataframe

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