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

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

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);
}

JavaScript

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

// 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 */
          progress.done(); // hides progress bar
          /* eslint-enable no-undef */
        },
      }),
    ],
  });

  deckOverlay.setMap(map);
}

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

<!DOCTYPE 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>

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script 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>

    <!-- Async script executes immediately and must be after any DOM elements used in callback. -->
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&v=weekly"
      async
    ></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