Google Maps and deck.gl GeoJsonLayer

Visualizing thousands of points

This example visualizes recent earthquakes using the deck.gl GeoJsonLayer and a ScatterPlot of earthquakes.

For more information, see https://deck.gl/.

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 { GeoJsonLayer } from "deck.gl";
// import { GoogleMapsOverlay } from "@deck.gl/google-maps";

const GeoJsonLayer = deck.GeoJsonLayer;
const GoogleMapsOverlay = deck.GoogleMapsOverlay;

type Properties = { mag: number };
type Feature = GeoJSON.Feature<GeoJSON.Point, Properties>;

// Initialize and add the map
function initMap(): void {
  const map = new google.maps.Map(
    document.getElementById("map") as HTMLElement,
    {
      center: { lat: 40, lng: -110 },
      zoom: 4,
    }
  );

  const deckOverlay = new GoogleMapsOverlay({
    layers: [
      new GeoJsonLayer({
        id: "earthquakes",
        data: "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_month.geojson",
        filled: true,
        pointRadiusMinPixels: 2,
        pointRadiusMaxPixels: 200,
        opacity: 0.4,
        pointRadiusScale: 0.3,
        getRadius: (f: Feature) => Math.pow(10, f.properties.mag),
        getFillColor: [255, 70, 30, 180],
        autoHighlight: true,
        transitions: {
          getRadius: {
            type: "spring",
            stiffness: 0.1,
            damping: 0.15,
            enter: () => [0], // grow from size 0,
            duration: 10000,
          },
        },
        onDataLoad: () => {
          /* eslint-disable no-undef */
          // @ts-ignore defined in include
          progress.done(); // hides progress bar
          /* eslint-enable no-undef */
        },
      }),
    ],
  });

  deckOverlay.setMap(map);
}

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

JavaScript

// import { GeoJsonLayer } from "deck.gl";
// import { GoogleMapsOverlay } from "@deck.gl/google-maps";
const GeoJsonLayer = deck.GeoJsonLayer;
const GoogleMapsOverlay = deck.GoogleMapsOverlay;

// Initialize and add the map
function initMap() {
  const map = new google.maps.Map(document.getElementById("map"), {
    center: { lat: 40, lng: -110 },
    zoom: 4,
  });
  const deckOverlay = new GoogleMapsOverlay({
    layers: [
      new GeoJsonLayer({
        id: "earthquakes",
        data: "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_month.geojson",
        filled: true,
        pointRadiusMinPixels: 2,
        pointRadiusMaxPixels: 200,
        opacity: 0.4,
        pointRadiusScale: 0.3,
        getRadius: (f) => Math.pow(10, f.properties.mag),
        getFillColor: [255, 70, 30, 180],
        autoHighlight: true,
        transitions: {
          getRadius: {
            type: "spring",
            stiffness: 0.1,
            damping: 0.15,
            enter: () => [0],
            duration: 10000,
          },
        },
        onDataLoad: () => {
          /* eslint-disable no-undef */
          // @ts-ignore defined in include
          progress.done(); // hides progress bar
          /* eslint-enable no-undef */
        },
      }),
    ],
  });

  deckOverlay.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 and Google Maps Platform</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <!-- Use Material Design Progress indicator -->
    <link
      href="https://unpkg.com/material-components-web@6.0.0/dist/material-components-web.css"
      rel="stylesheet"
    />
    <script src="https://unpkg.com/material-components-web@6.0.0/dist/material-components-web.min.js"></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
      role="progressbar"
      class="mdc-linear-progress"
      aria-label="Data Progress Bar"
    >
      <div class="mdc-linear-progress__buffer">
        <div class="mdc-linear-progress__buffer-bar"></div>
        <div class="mdc-linear-progress__buffer-dots"></div>
      </div>
      <div class="mdc-linear-progress__bar mdc-linear-progress__primary-bar">
        <span class="mdc-linear-progress__bar-inner"></span>
      </div>
      <div class="mdc-linear-progress__bar mdc-linear-progress__secondary-bar">
        <span class="mdc-linear-progress__bar-inner"></span>
      </div>
    </div>
    <script>
      var progress, progressDiv;
      progressDiv = document.querySelector(".mdc-linear-progress");
      progress = new mdc.linearProgress.MDCLinearProgress(progressDiv);
      progress.open();
      progress.determinate = false;
      progress.done = function () {
        progress.close();
        progressDiv.remove();
      };
    </script>

    <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=weekly"
      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-points 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