Draw GeoJSON points | UNL Map JS Docs

Draw points from a GeoJSON collection to a map.
Note
If you want to test this example, edit it in JSFiddle or CodePen and replace the "YOUR-OWN-API-KEY" and "YOUR-OWN-VPM-ID" placeholders with your actual api key and vpm id.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Draw GeoJSON points</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://unpkg.com/unl-map-js@0.1.5/lib/unl-map-js.js"></script>
<link href="https://unpkg.com/unl-map-js@0.1.5/lib/unl-map-js.css" rel="stylesheet" />
<link
href="https://unpkg.com/maplibre-gl@2.1.9/dist/maplibre-gl.css"
rel="stylesheet"
/>
<style>
	body { margin: 0; padding: 0; }
	#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<div id="map"></div>
<script>
var map = new UnlSdk.Map({
container: "map",
apiKey: "YOUR-OWN-API-KEY",
vpmId: "YOUR-OWN-VPM-ID",
center: [0, 0],
zoom: 1,
});
 
map.on("load", function () {
// Add an image to use as a custom marker
map.loadImage(
"https://u-n-l.github.io/unl-map-js-docs/assets/osgeo-logo.png",
function (error, image) {
if (error) throw error;
map.addImage("custom-marker", image);
// 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": ["Fira GO Regular"],
"text-offset": [0, 1.25],
"text-anchor": "top",
},
});
}
);
});
</script>
 
</body>
</html>