Practical OpenLayers 3 & Leaflet

OpenLayers 3

A high-performance, feature-packed library for all your mapping needs. -

The next version of the widely used OpenLayer library, a ground up rewrite with a focus on performance and mobile support while retaining the wide format support and rich GIS functionality.

Get started

Start a local webserver

Assuming you have a local copy of the repository, start a local Python webserver by

  • In a Terminal (Applications > Accessories > Terminal Emulator) change to the root of the repository. Assuming the repository is in your home directory run:

      cd ~/osgis-ol3-leaflet
  • To start the web server run:

      python -m SimpleHTTPServer
  • Open http://localhost:8000/ol3/ol3.html in a Web Browser where you should see a blank map ready for us to get started.

Editing files

To get started coding open ol3/ol3.js in a text editor then move on to building a basic map with OSM tiles. The other supporting files include:


The HTML file ol3.html will remain the same throughout the workshop, it provides the basic page structure of a full page map and includes the required CSS and JavaScript including ol3.js which you will be working on.

<!DOCTYPE html>
    <meta charset="utf-8" />
    <title>OpenLayers 3</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
    <link rel="stylesheet" href="lib/ol3/ol.css" />
    <link rel="stylesheet" href="lib/ol-popup.css" />
    <link rel="stylesheet" href="ol3.css" />
    <div id="map"></div>
    <script src="../common/lib/reqwest.min.js"></script>
    <script src="lib/proj4.js"></script>
    <script src="lib/ol3/ol.js"></script>
    <script src="lib/ol-popup.js"></script>
    <script src="ol3.js"></script>


The CSS file ol3.css will also remain unchanged, it defines some basic page style and ensures the map takes up the full page.

html, body {
  height: 100%;
  padding: 0;
  margin: 0;
  font-family: sans-serif;
  font-size: small;

#map {
  width: 100%;
  height: 100%;

Next step: build a basic map with OSM tiles.