GeoJSON point features with markers

import geopandas

gdf = geopandas.read_file(
    "https://raw.githubusercontent.com/python-visualization/folium-example-data/main/subway_stations.geojson"
)

gdf.head()

	name	url	line	objectid	notes	geometry
0	Astor Pl	http://web.mta.info/nyct/service/	4-6-6 Express	1	4 nights, 6-all times, 6 Express-weekdays AM s...	POINT (-73.99107 40.73005)
1	Canal St	http://web.mta.info/nyct/service/	4-6-6 Express	2	4 nights, 6-all times, 6 Express-weekdays AM s...	POINT (-74.00019 40.71880)
2	50th St	http://web.mta.info/nyct/service/	1-2	3	1-all times, 2-nights	POINT (-73.98385 40.76173)
3	Bergen St	http://web.mta.info/nyct/service/	2-3-4	4	4-nights, 3-all other times, 2-all times	POINT (-73.97500 40.68086)
4	Pennsylvania Ave	http://web.mta.info/nyct/service/	3-4	5	4-nights, 3-all other times	POINT (-73.89489 40.66471)

gdf['href'] = '<a href="' + gdf.url + '">' + gdf.url + "</a>"
gdf['service_level'] = gdf.notes.str.split(', ').apply(lambda x: len([v for v in x if "all" in v]))
gdf['lines_served'] = gdf.line.str.split('-').apply(lambda x: len(x))

service_levels = gdf.service_level.unique().tolist()
service_levels

[1, 2, 3, 0]

colors = ["orange", "yellow", "green", "blue"]

Use a Circle as a Marker

m = folium.Map(location=[40.75, -73.95], zoom_start=13)

folium.GeoJson(
    gdf,
    name="Subway Stations",
    marker=folium.Circle(radius=4, fill_color="orange", fill_opacity=0.4, color="black", weight=1),
    tooltip=folium.GeoJsonTooltip(fields=["name", "line", "notes"]),
    popup=folium.GeoJsonPopup(fields=["name", "line", "href", "notes"]),
    style_function=lambda x: {
        "fillColor": colors[x['properties']['service_level']],
        "radius": (x['properties']['lines_served'])*30,
    },
    highlight_function=lambda x: {"fillOpacity": 0.8},
    zoom_on_click=True,
).add_to(m)

m

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Or use a DivIcon

m = folium.Map(location=[40.75, -73.95], zoom_start=13)


def style_function(feature):
    props = feature.get('properties')
    markup = f"""
        <a href="{props.get('url')}">
            <div style="font-size: 0.8em;">
            <div style="width: 10px;
                        height: 10px;
                        border: 1px solid black;
                        border-radius: 5px;
                        background-color: orange;">
            </div>
            {props.get('name')}
        </div>
        </a>
    """
    return {"html": markup}


folium.GeoJson(
    gdf,
    name="Subway Stations",
    marker=folium.Marker(icon=folium.DivIcon()),
    tooltip=folium.GeoJsonTooltip(fields=["name", "line", "notes"]),
    popup=folium.GeoJsonPopup(fields=["name", "line", "href", "notes"]),
    style_function=style_function,
    zoom_on_click=True,
).add_to(m)

m

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Use a Marker

m = folium.Map(location=[40.75, -73.95], zoom_start=13)

marker_colors = ["red", "orange", "green", "blue"]

folium.GeoJson(
    gdf,
    name="Subway Stations",
    zoom_on_click=True,
    marker=folium.Marker(icon=folium.Icon(icon='star')),
    tooltip=folium.GeoJsonTooltip(fields=["name", "line", "notes"]),
    popup=folium.GeoJsonPopup(fields=["name", "line", "href", "notes"]),
    style_function=lambda x: {
        'markerColor': marker_colors[x['properties']['service_level']],
    },
).add_to(m)

m

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