Google Maps and deck.gl Trips Layer

  • This example visualizes vehicle trip data in New York City using the Deck.gl Trips Layer, displaying animated paths representing individual trips.

  • The visualization leverages Google Maps for the base map and integrates Deck.gl for rendering the animated trips data.

  • The code provides both TypeScript and JavaScript implementations, utilizing external libraries like Deck.gl and Google Maps JavaScript API.

  • Users can interact with the example through provided links to JSFiddle and Google Cloud Shell, or by cloning the sample code for local execution.

Visualize animated paths

This example shows vehicle trip data in New York City. The Trips Layer renders animated paths that represent vehicle trips.

TypeScript

import { GoogleMapsOverlay } from '@deck.gl/google-maps';
import { TripsLayer } from '@deck.gl/geo-layers';
import { Color } from '@deck.gl/core';

interface Data {
    vendor: number;
    path: [number, number][];
    timestamps: number[];
}

// Set the path to the GeoJSON data file.
const DATA_URL = new URL('./public/trips-v7.json', import.meta.url).toString();


const LOOP_LENGTH = 1800;
const VENDOR_COLORS: Color[] = [
    [255, 0, 0], // vendor #0
    [0, 0, 255], // vendor #1
];

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(45);

    let currentTime = 0;
    const props = {
        id: 'trips',
        data: DATA_URL, 
        getPath: (d: Data) => d.path,
        getTimestamps: (d: Data) => d.timestamps,
        getColor: (d: Data) => VENDOR_COLORS[d.vendor],
        opacity: 1,
        widthMinPixels: 2,
        trailLength: 180,
        currentTime,
        shadowEnabled: false,
    };

    const overlay = new GoogleMapsOverlay({});

    const animate = () => {
        currentTime = (currentTime + 1) % LOOP_LENGTH;

        const tripsLayer = new TripsLayer({
            ...props,
            currentTime,
        });

        overlay.setProps({
            layers: [tripsLayer],
        });

        window.requestAnimationFrame(animate);
    };

    window.requestAnimationFrame(animate);

    overlay.setMap(innerMap);
}

initMap();
index.ts

JavaScript

import { GoogleMapsOverlay } from '@deck.gl/google-maps';
import { TripsLayer } from '@deck.gl/geo-layers';
// Set the path to the GeoJSON data file.
const DATA_URL = new URL('./public/trips-v7.json', import.meta.url).toString();
const LOOP_LENGTH = 1800;
const VENDOR_COLORS = [
    [255, 0, 0], // vendor #0
    [0, 0, 255], // vendor #1
];
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(45);
    let currentTime = 0;
    const props = {
        id: 'trips',
        data: DATA_URL,
        getPath: (d) => d.path,
        getTimestamps: (d) => d.timestamps,
        getColor: (d) => VENDOR_COLORS[d.vendor],
        opacity: 1,
        widthMinPixels: 2,
        trailLength: 180,
        currentTime,
        shadowEnabled: false,
    };
    const overlay = new GoogleMapsOverlay({});
    const animate = () => {
        currentTime = (currentTime + 1) % LOOP_LENGTH;
        const tripsLayer = new TripsLayer({
            ...props,
            currentTime,
        });
        overlay.setProps({
            layers: [tripsLayer],
        });
        window.requestAnimationFrame(animate);
    };
    window.requestAnimationFrame(animate);
    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 Trips Layer</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-tripslayer" });</script>
    </head>
    <body>
        <gmp-map
            map-id="fae05836df2dc8bb"
            center="40.72,-74.00"
            zoom="15"
        ></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-tripslayer
  npm i
  npm start