Google Maps and deck.gl ArcLayer

  • This example visualizes curved connections between Prague and major airports worldwide using the ArcLayer from deck.gl.

  • The ArcLayer is rendered on top of a Google Map, displaying flight paths originating from Prague.

  • The code utilizes GeoJSON data of airports and filters them based on a scalerank property for visualization.

  • You can interact with a live version of this example on JSFiddle or clone the sample code for local execution.

Visualize points with arcs

This example uses arcs to show curved point-to-point connections between airports and the city of Prague. The ArcLayer renders raised arcs joining pairs of source and target points.

TypeScript

import { GoogleMapsOverlay } from '@deck.gl/google-maps';
import { ArcLayer } from '@deck.gl/layers';
import type * as GeoJSON from 'geojson';

type Properties = { scalerank: number };
type Feature = GeoJSON.Feature<GeoJSON.Point, Properties>;
type Data = GeoJSON.FeatureCollection<GeoJSON.Point, Properties>;

async function initMap() {
    // Request needed libraries.
    (await google.maps.importLibrary('maps')) as google.maps.MapsLibrary;

    // Get the gmp-map element.
    const mapElement = document.querySelector(
        'gmp-map'
    ) as google.maps.MapElement;

    // Get the inner map.
    const innerMap = mapElement.innerMap;

    innerMap.setTilt(30); // Set tilt after map initialization.

    // Set the path to the GeoJSON data file.
    const dataUrl = new URL('./public/ne_10m_airports.geojson', import.meta.url).toString();

    const flightsLayer = new ArcLayer<Feature>({
        id: 'flights',
        data: dataUrl,
        dataTransform: (data: any) =>
            data.features.filter((f: any) => f.properties.scalerank < 4),
        getSourcePosition: () => [14.42076, 50.08804], // Prague
        getTargetPosition: (f: Feature) =>
            f.geometry.coordinates as [number, number],
        getSourceColor: [0, 128, 200],
        getTargetColor: [0, 0, 80],
        getWidth: 1,
    });

    const overlay = new GoogleMapsOverlay({
        layers: [flightsLayer],
    });

    overlay.setMap(innerMap);
}

initMap();
index.ts

JavaScript

import { GoogleMapsOverlay } from '@deck.gl/google-maps';
import { ArcLayer } from '@deck.gl/layers';
async function initMap() {
    // Request needed libraries.
    (await google.maps.importLibrary('maps'));
    // Get the gmp-map element.
    const mapElement = document.querySelector('gmp-map');
    // Get the inner map.
    const innerMap = mapElement.innerMap;
    innerMap.setTilt(30); // Set tilt after map initialization.
    // Set the path to the GeoJSON data file.
    const dataUrl = new URL('./public/ne_10m_airports.geojson', import.meta.url).toString();
    const flightsLayer = new ArcLayer({
        id: 'flights',
        data: dataUrl,
        dataTransform: (data) => data.features.filter((f) => f.properties.scalerank < 4),
        getSourcePosition: () => [14.42076, 50.08804], // Prague
        getTargetPosition: (f) => f.geometry.coordinates,
        getSourceColor: [0, 128, 200],
        getTargetColor: [0, 0, 80],
        getWidth: 1,
    });
    const overlay = new GoogleMapsOverlay({
        layers: [flightsLayer],
    });
    overlay.setMap(innerMap);
}
initMap();
index.js

CSS

/* 
 * Always set the map height explicitly to define the size of the div element
 * that contains the map. 
 */
#map {
    height: 100%;
}

/* 
 * Optional: Makes the sample page fill the window. 
 */
html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
}

style.css

HTML

<html>
    <head>
        <title>deck.gl ArcLayer</title>

        <link rel="stylesheet" type="text/css" href="./style.css" />
        <script type="module" src="./index.js"></script>
        <!-- prettier-ignore -->
        <script>(g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})
        ({key: "AIzaSyA6myHzS10YXdcazAFalmXvDkrYCp5cLc8", v: "weekly", internalUsageAttributionIds: "gmp_git_jsapisamples_v1_deckgl-arclayer" });</script>

    </head>
    <body>
        <gmp-map center="50,14" map-id="90f87356969d889c" zoom="3"></gmp-map>
    </body>
</html>
index.html

Try Sample

Clone Sample

Git and Node.js are required to run this sample locally. Follow these instructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application. 

  git clone https://github.com/googlemaps-samples/js-api-samples.git
  cd samples/deckgl-arclayer
  npm i
  npm start