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Measure distances

Click points on a map to create lines that measure distanced using turf.lineDistance.

Mapbox GL unsupported
Mapbox GL requires WebGL support. Please check that you are using a supported browser and that WebGL is enabled.
<!DOCTYPE html>
<meta charset='utf-8' />
<title>Measure distances</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v1.0.0/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v1.0.0/mapbox-gl.css' rel='stylesheet' />
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
.distance-container {
position: absolute;
top: 10px;
left: 10px;
z-index: 1;
.distance-container > * {
background-color: rgba(0, 0, 0, 0.5);
color: #fff;
font-size: 11px;
line-height: 18px;
display: block;
margin: 0;
padding: 5px 10px;
border-radius: 3px;
<div id='map'></div>
<div id='distance' class='distance-container'></div>
<script src='https://api.mapbox.com/mapbox.js/plugins/turf/v2.0.2/turf.min.js'></script>
mapboxgl.accessToken = '<your access token here>';
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/streets-v11',
center: [2.3399, 48.8555],
zoom: 12
var distanceContainer = document.getElementById('distance');
// GeoJSON object to hold our measurement features
var geojson = {
"type": "FeatureCollection",
"features": []
// Used to draw a line between points
var linestring = {
"type": "Feature",
"geometry": {
"type": "LineString",
"coordinates": []
map.on('load', function() {
map.addSource('geojson', {
"type": "geojson",
"data": geojson
// Add styles to the map
id: 'measure-points',
type: 'circle',
source: 'geojson',
paint: {
'circle-radius': 5,
'circle-color': '#000'
filter: ['in', '$type', 'Point']
id: 'measure-lines',
type: 'line',
source: 'geojson',
layout: {
'line-cap': 'round',
'line-join': 'round'
paint: {
'line-color': '#000',
'line-width': 2.5
filter: ['in', '$type', 'LineString']
map.on('click', function(e) {
var features = map.queryRenderedFeatures(e.point, { layers: ['measure-points'] });
// Remove the linestring from the group
// So we can redraw it based on the points collection
if (geojson.features.length > 1) geojson.features.pop();
// Clear the Distance container to populate it with a new value
distanceContainer.innerHTML = '';
// If a feature was clicked, remove it from the map
if (features.length) {
var id = features[0].properties.id;
geojson.features = geojson.features.filter(function(point) {
return point.properties.id !== id;
} else {
var point = {
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": [
"properties": {
"id": String(new Date().getTime())
if (geojson.features.length > 1) {
linestring.geometry.coordinates = geojson.features.map(function(point) {
return point.geometry.coordinates;
// Populate the distanceContainer with total distance
var value = document.createElement('pre');
value.textContent = 'Total distance: ' + turf.lineDistance(linestring).toLocaleString() + 'km';
map.on('mousemove', function (e) {
var features = map.queryRenderedFeatures(e.point, { layers: ['measure-points'] });
// UI indicator for clicking/hovering a point on the map
map.getCanvas().style.cursor = (features.length) ? 'pointer' : 'crosshair';