Google Maps and deck.gl ArcLayer

Visualizing 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

// TODO Use imports when Deck.gl works in more bundlers
// https://github.com/visgl/deck.gl/issues/6351#issuecomment-1079424167

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

const ArcLayer = deck.ArcLayer;
const GoogleMapsOverlay = deck.GoogleMapsOverlay;

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

const AIRPORTS =
  "https://d2ad6b4ur7yvpq.cloudfront.net/naturalearth-3.3.0/ne_10m_airports.geojson";

function initMap(): void {
  const map = new google.maps.Map(
    document.getElementById("map") as HTMLElement,
    {
      center: { lat: 50, lng: 14 },
      tilt: 30,
      mapId: "90f87356969d889c",
      zoom: 3,
    }
  );

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

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

  overlay.setMap(map);
}

declare global {
  interface Window {
    initMap: () => void;
  }
}
window.initMap = initMap;

JavaScript

// import { ArcLayer} from "deck.gl";
// import { GoogleMapsOverlay } from "@deck.gl/google-maps";
const ArcLayer = deck.ArcLayer;
const GoogleMapsOverlay = deck.GoogleMapsOverlay;
const AIRPORTS =
  "https://d2ad6b4ur7yvpq.cloudfront.net/naturalearth-3.3.0/ne_10m_airports.geojson";

function initMap() {
  const map = new google.maps.Map(document.getElementById("map"), {
    center: { lat: 50, lng: 14 },
    tilt: 30,
    mapId: "90f87356969d889c",
    zoom: 3,
  });
  const flightsLayer = new ArcLayer({
    id: "flights",
    data: AIRPORTS,
    dataTransform: (d) => d.features.filter((f) => f.properties.scalerank < 4),
    getSourcePosition: () => [14.42076, 50.08804],
    getTargetPosition: (f) => f.geometry.coordinates,
    getSourceColor: [0, 128, 200],
    getTargetColor: [0, 0, 80],
    getWidth: 1,
  });
  const overlay = new GoogleMapsOverlay({
    layers: [flightsLayer],
  });

  overlay.setMap(map);
}

window.initMap = initMap;

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;
}

HTML

<html>
  <head>
    <title>deck.gl ArcLayer</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script src="https://unpkg.com/deck.gl@8.7.3/dist.min.js"></script>
    <script src="https://unpkg.com/@deck.gl/google-maps@8.7.3/dist.min.js"></script>

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script type="module" src="./index.js"></script>
  </head>
  <body>
    <div id="map"></div>

    <!-- 
     The `defer` attribute causes the callback to execute after the full HTML
     document has been parsed. For non-blocking uses, avoiding race conditions,
     and consistent behavior across browsers, consider loading using Promises
     with https://www.npmjs.com/package/@googlemaps/js-api-loader.
    -->
    <script
      src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=beta"
      defer
    ></script>
  </body>
</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 -b sample-deckgl-arclayer https://github.com/googlemaps/js-samples.git
  cd js-samples
  npm i
  npm start

Other samples can be tried by switching to any branch beginning with sample-SAMPLE_NAME.

  git checkout sample-SAMPLE_NAME
  npm i
  npm start