map1.py

import folium
import pandas
data = pandas.read_csv("Volcanoes.txt")
lat = list(data['LAT'])
lon = list(data['LON'])
elev = list(data['ELEV'])

def color_band(elevation):
    if elevation < 1000:
        return 'green'
    elif 1000<= elevation < 3000:
        return 'orange'
    else:
        return 'red'

map = folium.Map(location=[42.88,-83.4], zoom_start=6,tiles="Mapbox Bright")

fgv = folium.FeatureGroup(name='Volcanoes')

for lt,ln,el in zip(lat, lon, elev):
    fgv.add_child(folium.Marker(location=[lt,ln], popup=str(el)+ " m",icon=folium.Icon(color_band(el))))


fgp = folium.FeatureGroup(name='Population')

fgp.add_child(folium.GeoJson(data=open('115 world.json','r', encoding='utf-8-sig').read(),
style_function=lambda x: {'fillColor':'green' if x['properties']['POP2005'] <10000000
else 'orange' if 10000000<=x['properties']['POP2005'] < 20000000 else 'red'}))

map.add_child(fgv)
map.add_child(fgp)
map.add_child(folium.LayerControl())
map.save("Map1.html")