Add live realtime data

Use live real-time GeoJSON data streams to move a symbol on your map.


npm install --save @maptiler/sdk

main.js

import { Map, MapStyle, config } from '@maptiler/sdk';
import '@maptiler/sdk/dist/maptiler-sdk.css';

config.apiKey = 'YOUR_MAPTILER_API_KEY_HERE';
const map = new Map({
    container: 'map',
    style: MapStyle.STREETS, 
    zoom: 0
});

const url = 'https://api.wheretheiss.at/v1/satellites/25544';
map.on('load', function () {
    const request = new XMLHttpRequest();
    window.setInterval(function () {
        // make a GET request to parse the GeoJSON at the url
        request.open('GET', url, true);
        request.onload = function () {
            if (this.status >= 200 && this.status < 400) {
                // retrieve the JSON from the response
                const json = JSON.parse(this.response);

                const { latitude, longitude } = json;
                const data = {
                    'type': 'FeatureCollection',
                    'features': [
                        {
                        'type': 'Feature',
                        'geometry': {
                            'type': 'Point',
                            'coordinates': [longitude, latitude]
                        }
                        }
                    ]
                }

                // update the drone symbol's location on the map
                map.getSource('drone').setData(data);

                // fly the map to the drone's current location
                map.flyTo({
                    center: [longitude, latitude],
                    zoom: 7, 
                    speed: 0.5
                });
            }
        };
        request.send();
    }, 2000);

    map.addSource('drone', { type: 'geojson', data: url });
    map.addLayer({
        'id': 'drone',
        'type': 'symbol',
        'source': 'drone',
        'layout': {
            'icon-image': 'aquarium'
        }
    });
});

index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="robots" content="noindex">
  <title>Add live realtime data | NPM example</title>
  <link rel="stylesheet" href="./style.css">
</head>
<body>
  <div id="map"></div>
  <script type="module" src="./main.js"></script>
</body>
</html>

style.css

body {margin: 0; padding: 0;}
#map {position: absolute; top: 0; bottom: 0; width: 100%;}

<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Add live realtime data</title>
<script src="https://cdn.maptiler.com/maptiler-sdk-js/v4.1.0/maptiler-sdk.umd.min.js"></script>
<link href="https://cdn.maptiler.com/maptiler-sdk-js/v4.1.0/maptiler-sdk.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>
    maptilersdk.config.apiKey = 'YOUR_MAPTILER_API_KEY_HERE';
    const map = new maptilersdk.Map({
        container: 'map',
        style: maptilersdk.MapStyle.STREETS, 
        zoom: 0
    });

    const url = 'https://api.wheretheiss.at/v1/satellites/25544';
    map.on('load', function () {
        const request = new XMLHttpRequest();
        window.setInterval(function () {
            // make a GET request to parse the GeoJSON at the url
            request.open('GET', url, true);
            request.onload = function () {
                if (this.status >= 200 && this.status < 400) {
                    // retrieve the JSON from the response
                    const json = JSON.parse(this.response);

                    const { latitude, longitude } = json;
                    const data = {
                        'type': 'FeatureCollection',
                        'features': [
                            {
                            'type': 'Feature',
                            'geometry': {
                                'type': 'Point',
                                'coordinates': [longitude, latitude]
                            }
                            }
                        ]
                    }

                    // update the drone symbol's location on the map
                    map.getSource('drone').setData(data);

                    // fly the map to the drone's current location
                    map.flyTo({
                        center: [longitude, latitude],
                        zoom: 7, 
                        speed: 0.5
                    });
                }
            };
            request.send();
        }, 2000);

        map.addSource('drone', { type: 'geojson', data: url });
        map.addLayer({
            'id': 'drone',
            'type': 'symbol',
            'source': 'drone',
            'layout': {
                'icon-image': 'aquarium'
            }
        });
    });
</script>
</body>
</html>