Draw GeoJSON points
Draw points from a GeoJSON collection to a map.
<!DOCTYPE html>
<html lang="en">
<head>
<title>Draw GeoJSON points</title>
<meta property="og:description" content="Draw points from a GeoJSON collection to a map." />
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/trackasia-gl.css" />
<script src="https://unpkg.com/[email protected]/dist/trackasia-gl.js"></script>
<style>
body {
margin: 0;
padding: 0;
}
html,
body,
#map {
height: 100%;
}
</style>
</head>
<body>
<div id="map"></div>
<script>
const map = new trackasiagl.Map({
container: "map",
style: "https://maps.track-asia.com/styles/v1/streets.json?key=public_key",
center: [0, 0],
zoom: 1,
});
map.on("load", async () => {
// Add an image to use as a custom marker
const image = await map.loadImage(
"https://docs.track-asia.com/assets/osgeo-logo.png"
);
map.addImage("custom-marker", image.data);
// Add a GeoJSON source with 15 points
map.addSource("conferences", {
type: "geojson",
data: {
type: "FeatureCollection",
features: [
{
type: "Feature",
geometry: {
type: "Point",
coordinates: [100.4933, 13.7551],
},
properties: { year: "2004" },
},
{
type: "Feature",
geometry: {
type: "Point",
coordinates: [6.6523, 46.5535],
},
properties: { year: "2006" },
},
{
type: "Feature",
geometry: {
type: "Point",
coordinates: [-123.3596, 48.4268],
},
properties: { year: "2007" },
},
{
type: "Feature",
geometry: {
type: "Point",
coordinates: [18.4264, -33.9224],
},
properties: { year: "2008" },
},
{
type: "Feature",
geometry: {
type: "Point",
coordinates: [151.195, -33.8552],
},
properties: { year: "2009" },
},
{
type: "Feature",
geometry: {
type: "Point",
coordinates: [2.1404, 41.3925],
},
properties: { year: "2010" },
},
{
type: "Feature",
geometry: {
type: "Point",
coordinates: [-104.8548, 39.7644],
},
properties: { year: "2011" },
},
{
type: "Feature",
geometry: {
type: "Point",
coordinates: [-1.1665, 52.9539],
},
properties: { year: "2013" },
},
{
type: "Feature",
geometry: {
type: "Point",
coordinates: [-122.6544, 45.5428],
},
properties: { year: "2014" },
},
{
type: "Feature",
geometry: {
type: "Point",
coordinates: [126.974, 37.5651],
},
properties: { year: "2015" },
},
{
type: "Feature",
geometry: {
type: "Point",
coordinates: [7.1112, 50.7255],
},
properties: { year: "2016" },
},
{
type: "Feature",
geometry: {
type: "Point",
coordinates: [-71.0314, 42.3539],
},
properties: { year: "2017" },
},
{
type: "Feature",
geometry: {
type: "Point",
coordinates: [39.2794, -6.8173],
},
properties: { year: "2018" },
},
{
type: "Feature",
geometry: {
type: "Point",
coordinates: [26.0961, 44.4379],
},
properties: { year: "2019" },
},
{
type: "Feature",
geometry: {
type: "Point",
coordinates: [-114.0879, 51.0279],
},
properties: { year: "2020" },
},
],
},
});
// Add a symbol layer
map.addLayer({
id: "conferences",
type: "symbol",
source: "conferences",
layout: {
"icon-image": "custom-marker",
// get the year from the source's "year" property
"text-field": ["get", "year"],
"text-font": [
"DIN Pro Regular",
"Arial Unicode MS Regular",
],
"text-offset": [0, 1.25],
"text-anchor": "top",
},
});
});
</script>
</body>
</html>