Python folium example

Candice 148 Published: 06/26/2024

Python folium example

I'll respond in English, and I'll provide a Python Folium example for you.

Folium is a powerful open-source library that allows you to create interactive maps using the popular Python programming language. With Folium, you can create a wide range of map visualizations, from simple maps with markers or polygons to complex interactive dashboards with real-time data updates.

Here's an example of how you can use Folium to create an interactive map:

import folium

from IPython.display import IFrame

Create a new map instance

m = folium.Map(location=[40, -100], zoom_start=4)


Add markers for major cities in the United States

for city in ['New York', 'Los Angeles', 'Chicago', 'Houston']:


if city == 'New York':


folium.Marker([40.7128, 74.0060],


popup='The Big Apple!').add_to(m)


elif city == 'Los Angeles':


folium.Marker([34.0522, 118.2437],


popup='La-La Land!').add_to(m)


elif city == 'Chicago':


folium.Marker([41.8781, 87.6298],


popup='The Windy City!').add_to(m)


else:


folium.Marker([29.7633, 95.3632],


popup='Space City!').add_to(m)

Add a polygon for the state of California

folium.RegularPolygonMarker(location=[37.7749, -122.4194],


radius=100000,


tooltip='California!',


fill_color='blue',


fill_opacity=0.5).add_to(m)

Display the map

m


IFrame('map.html', width=800, height=600)

In this example, we create a new Folium map instance and set its location to the center of the United States (40° north latitude and 100° west longitude) with an initial zoom level of 4. We then add markers for major cities in the United States using the folium.Marker class.

Next, we add a polygon marker representing the state of California using the folium.RegularPolygonMarker class. Finally, we display the map using the IFrame class from IPython.

When you run this code, Folium will generate an interactive HTML file that you can open in a web browser to see the map in action. You can zoom in and out, pan across the map, and click on markers and polygons to get more information about each location.

I hope this helps! Let me know if you have any questions or need further assistance.

Python folium tutorial

I'd be happy to provide a Folium tutorial in English! Here it is:

Introduction

Folium is an open-source library for Python that allows you to create interactive maps and plot data on top of them. It's built on top of Leaflet, which is a popular JavaScript library for creating interactive maps. With Folium, you can easily add markers, polygons, and other elements to your map, as well as style it with various themes and overlays.

Basic Usage

To use Folium, you'll need to install it first using pip:

pip install folium

Once installed, here's an example of how you might create a basic map with a marker:

import folium
Create a map centered on the city of Berlin

m = folium.Map(location=[52.5200, 13.4050], zoom_start=12)

Add a marker to the map at a specific location

marker = folium.Marker([52.5309, 13.4043], popup='Hello, Berlin!')


marker.add_to(m)

Save the map as an HTML file

m.save('berlin_map.html')

This code creates a map centered on Berlin, adds a marker with a popup text "Hello, Berlin!", and then saves it to an HTML file.

Adding Popups

Popups are a great way to add additional information to your markers. Here's how you can create a simple popup:

import folium
Create a map centered on the city of Paris

m = folium.Map(location=[48.8566, 2.3522], zoom_start=12)

Add a marker to the map at a specific location with a popup

marker = folium.Marker([48.8514, 2.2943],


popup=f'
{marker_name}
This is some text!
')

marker.add_to(m)

Save the map as an HTML file

m.save('paris_map.html')

In this example, we create a popup with a title and some text inside it.

Adding Polygons

You can also add polygons to your map. Here's how:

import folium
Create a map centered on the city of Tokyo

m = folium.Map(location=[35.6895, 139.7670], zoom_start=12)

Define the polygon coordinates

poly_coords = [(35.6863, 139.7446), (35.6998, 139.7421),


(35.7014, 139.7559), (35.6947, 139.7545)]

Add a polygon to the map

folium.RegularPolygonMarker(


location=[35.6984, 139.7513],


size=10000,


radius=None,


color='blue',


fill=True,


).add_to(m)

Save the map as an HTML file

m.save('tokyo_map.html')

In this example, we create a simple polygon around Tokyo.

Adding Overlays

You can add various overlays to your map, such as OpenStreetMap (OSM) tiles or satellite imagery. Here's how:

import folium
Create a map centered on the city of New York

m = folium.Map(location=[40.7128, 74.0060], zoom_start=12)

Add OSM tiles to the map

folium.TileLayer('OpenStreetMap').add_to(m)

Save the map as an HTML file

m.save('new_york_map.html')

This code adds the OSM tile overlay to our map.

Conclusion

Folium is a powerful and easy-to-use library for creating interactive maps in Python. With its many features, you can add markers, polygons, popups, and more to your maps. Whether you're working on a project or just want to create some cool visualizations, Folium has got you covered!

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