Cluster Points
Configure the map to cluster nearby points and show a count of the clustered points at higher zoom levels.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<link rel="stylesheet" href="https://maps-sdk.trimblemaps.com/v3/trimblemaps-3.21.0.css" />
<script src="https://maps-sdk.trimblemaps.com/v3/trimblemaps-3.21.0.js"></script>
<style>
body { margin: 0; padding: 0; }
#map {
position: absolute;
top: 0;
bottom: 0;
width: 100%;
}
</style>
</head>
<body>
<div id="map"></div>
<script>
TrimbleMaps.APIKey = 'YOUR_API_KEY_HERE';
const map = new TrimbleMaps.Map({
container: 'map',
center: new TrimbleMaps.LngLat(-78.566234, 40.499440),
zoom: 8
});
const bounds = map.getBounds();
const north = bounds.getNorth();
const south = bounds.getSouth();
const east = bounds.getEast();
const west = bounds.getWest();
// Functions for generating random points and features
function getRandomPoint() {
const lng = west + ((east - west) * Math.random());
const lat = south + ((north - south) * Math.random());
return [lng, lat];
}
function getGeoJsonFeatures() {
const features = [];
for (var i = 0; i < 250; i++) {
features.push({
type: 'Feature',
properties: {},
geometry: {
type: 'Point',
coordinates: getRandomPoint()
}
});
}
return features;
}
// Wait for the map to load before adding layers and data sources
map.on('load', function() {
// Use cluster properties on datasource to group data
map.addSource('randomPoints', {
type: 'geojson',
cluster: true,
clusterRadius: 40,
clusterMaxZoom: 14,
data: {
type: 'FeatureCollection',
features: getGeoJsonFeatures()
}
});
// Use filter to shot clustered points
map.addLayer({
id: 'clusteredPoints',
type: 'circle',
source: 'randomPoints',
filter: ['has', 'point_count'],
paint: {
'circle-radius': [
'step',
['get', 'point_count'],
15, 5,
20, 50,
25
],
'circle-color': '#E33',
'circle-stroke-color': '#FFF',
'circle-stroke-width': 3
}
});
// Show count for clustered points
map.addLayer({
id: 'clusterCount',
type: 'symbol',
source: 'randomPoints',
filter: ['has', 'point_count'],
layout: {
'text-field': '{point_count}',
'text-font': ['Roboto Regular'],
'text-size': 12
},
paint: {
'text-color': '#FFF'
}
});
// Use filter to show unclustered points
map.addLayer({
id: 'unclusteredPoints',
type: 'circle',
source: 'randomPoints',
filter: ['!', ['has', 'point_count']],
paint: {
'circle-radius': 10,
'circle-color': '#11A',
'circle-stroke-color': '#FFF',
'circle-stroke-width': 2
}
});
});
</script>
</body>
</html>
Cluster Points
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<link rel="stylesheet" href="https://maps-sdk.trimblemaps.com/v3/trimblemaps-3.21.0.css" />
<script src="https://maps-sdk.trimblemaps.com/v3/trimblemaps-3.21.0.js"></script>
<style>
body { margin: 0; padding: 0; }
#map {
position: absolute;
top: 0;
bottom: 0;
width: 100%;
}
</style>
</head>
<body>
<div id="map"></div>
<script>
TrimbleMaps.APIKey = 'YOUR_API_KEY_HERE';
const map = new TrimbleMaps.Map({
container: 'map',
center: new TrimbleMaps.LngLat(-78.566234, 40.499440),
zoom: 8
});
const bounds = map.getBounds();
const north = bounds.getNorth();
const south = bounds.getSouth();
const east = bounds.getEast();
const west = bounds.getWest();
// Functions for generating random points and features
function getRandomPoint() {
const lng = west + ((east - west) * Math.random());
const lat = south + ((north - south) * Math.random());
return [lng, lat];
}
function getGeoJsonFeatures() {
const features = [];
for (var i = 0; i < 250; i++) {
features.push({
type: 'Feature',
properties: {},
geometry: {
type: 'Point',
coordinates: getRandomPoint()
}
});
}
return features;
}
// Wait for the map to load before adding layers and data sources
map.on('load', function() {
// Use cluster properties on datasource to group data
map.addSource('randomPoints', {
type: 'geojson',
cluster: true,
clusterRadius: 40,
clusterMaxZoom: 14,
data: {
type: 'FeatureCollection',
features: getGeoJsonFeatures()
}
});
// Use filter to shot clustered points
map.addLayer({
id: 'clusteredPoints',
type: 'circle',
source: 'randomPoints',
filter: ['has', 'point_count'],
paint: {
'circle-radius': [
'step',
['get', 'point_count'],
15, 5,
20, 50,
25
],
'circle-color': '#E33',
'circle-stroke-color': '#FFF',
'circle-stroke-width': 3
}
});
// Show count for clustered points
map.addLayer({
id: 'clusterCount',
type: 'symbol',
source: 'randomPoints',
filter: ['has', 'point_count'],
layout: {
'text-field': '{point_count}',
'text-font': ['Roboto Regular'],
'text-size': 12
},
paint: {
'text-color': '#FFF'
}
});
// Use filter to show unclustered points
map.addLayer({
id: 'unclusteredPoints',
type: 'circle',
source: 'randomPoints',
filter: ['!', ['has', 'point_count']],
paint: {
'circle-radius': 10,
'circle-color': '#11A',
'circle-stroke-color': '#FFF',
'circle-stroke-width': 2
}
});
});
</script>
</body>
</html>