3d-polyline

Sample code supporting Google Maps Platform JavaScript API documentation. author(s): Geo Developer IX Documentation Team

HTML

<!doctype html>
<!--
 @license
 Copyright 2025 Google LLC. All Rights Reserved.
 SPDX-License-Identifier: Apache-2.0
-->

<html>
  <head>
    <title>Map</title>

    <script>
      // prettier-ignore
      (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))})({
            });
    </script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>

CSS

/*
* @license
* Copyright 2025 Google LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/

/* 
 * Always set the map height explicitly to define the size of the div element
 * that contains the map. 
 */
html,
map {
  height: 100%;
}
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

JavaScript

'use strict';
/*
 * @license
 * Copyright 2025 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

let map;
async function init() {
  const { Map3DElement, Polyline3DElement } =
    await google.maps.importLibrary('maps3d');

  map = new Map3DElement({
    center: { lat: 37.7927, lng: -122.402, altitude: 65.93 },
    range: 3362.87,
    tilt: 64.01,
    heading: 25.0,
    mode: 'SATELLITE',
  });

  document.body.append(map);

  const polyline = new Polyline3DElement({
    path: [
      { lat: 37.80515638571346, lng: -122.4032569467164 },
      { lat: 37.80337073509504, lng: -122.4012878349353 },
      { lat: 37.79925208843463, lng: -122.3976697250461 },
      { lat: 37.7989102378512, lng: -122.3983408725656 },
      { lat: 37.79887832784348, lng: -122.3987094864192 },
      { lat: 37.79786443410338, lng: -122.4066878788802 },
      { lat: 37.79549248916587, lng: -122.4032992702785 },
      { lat: 37.78861484290265, lng: -122.4019489189814 },
      { lat: 37.78618687561075, lng: -122.398969592545 },
      { lat: 37.7892310309145, lng: -122.3951458683092 },
      { lat: 37.7916358762409, lng: -122.3981969390652 },
    ],
    strokeColor: 'blue',
    outerColor: 'white',
    strokeWidth: 10,
    outerWidth: 0.4,
    altitudeMode: 'RELATIVE_TO_GROUND', // Place it on the ground (as it has no altitude it will just be at ground height).
    drawsOccludedSegments: true, // Show the line through the buildings or anything else that might get in the way.
  });

  map.append(polyline);
}

void init();