Elevation Service

This example demonstrates the use of the ElevationService object. Click on the map to display the elevation at the clicked point. Read the documentation .

TypeScript

 function 
  
 initMap 
 () 
 : 
  
 void 
  
 { 
  
 const 
  
 map 
  
 = 
  
 new 
  
 google 
 . 
 maps 
 . 
 Map 
 ( 
  
 document 
 . 
 getElementById 
 ( 
 "map" 
 ) 
  
 as 
  
 HTMLElement 
 , 
  
 { 
  
 zoom 
 : 
  
 8 
 , 
  
 center 
 : 
  
 { 
  
 lat 
 : 
  
 63.333 
 , 
  
 lng 
 : 
  
 - 
 150.5 
  
 }, 
  
 // Denali. 
  
 mapTypeId 
 : 
  
 "terrain" 
 , 
  
 } 
  
 ); 
  
 const 
  
 elevator 
  
 = 
  
 new 
  
 google 
 . 
 maps 
 . 
 ElevationService 
 (); 
  
 const 
  
 infowindow 
  
 = 
  
 new 
  
 google 
 . 
 maps 
 . 
 InfoWindow 
 ({}); 
  
 infowindow 
 . 
 open 
 ( 
 map 
 ); 
  
 // Add a listener for the click event. Display the elevation for the LatLng of 
  
 // the click inside the infowindow. 
  
 map 
 . 
 addListener 
 ( 
 "click" 
 , 
  
 ( 
 event 
 ) 
  
 = 
>  
 { 
  
 displayLocationElevation 
 ( 
 event 
 . 
 latLng 
 , 
  
 elevator 
 , 
  
 infowindow 
 ); 
  
 }); 
 } 
 function 
  
 displayLocationElevation 
 ( 
  
 location 
 : 
  
 google.maps.LatLng 
 , 
  
 elevator 
 : 
  
 google.maps.ElevationService 
 , 
  
 infowindow 
 : 
  
 google.maps.InfoWindow 
 ) 
  
 { 
  
 // Initiate the location request 
  
 elevator 
  
 . 
 getElevationForLocations 
 ({ 
  
 locations 
 : 
  
 [ 
 location 
 ], 
  
 }) 
  
 . 
 then 
 (({ 
  
 results 
  
 }) 
  
 = 
>  
 { 
  
 infowindow 
 . 
 setPosition 
 ( 
 location 
 ); 
  
 // Retrieve the first result 
  
 if 
  
 ( 
 results 
 [ 
 0 
 ]) 
  
 { 
  
 // Open the infowindow indicating the elevation at the clicked position. 
  
 infowindow 
 . 
 setContent 
 ( 
  
 "The elevation at this point <br>is " 
  
 + 
  
 results 
 [ 
 0 
 ]. 
 elevation 
  
 + 
  
 " meters." 
  
 ); 
  
 } 
  
 else 
  
 { 
  
 infowindow 
 . 
 setContent 
 ( 
 "No results found" 
 ); 
  
 } 
  
 }) 
  
 . 
 catch 
 (( 
 e 
 ) 
  
 = 
>  
 infowindow 
 . 
 setContent 
 ( 
 "Elevation service failed due to: " 
  
 + 
  
 e 
 ) 
  
 ); 
 } 
 declare 
  
 global 
  
 { 
  
 interface 
  
 Window 
  
 { 
  
 initMap 
 : 
  
 () 
  
 = 
>  
 void 
 ; 
  
 } 
 } 
 window 
 . 
 initMap 
  
 = 
  
 initMap 
 ; 
  

JavaScript

 function 
  
 initMap 
 () 
  
 { 
  
 const 
  
 map 
  
 = 
  
 new 
  
 google 
 . 
 maps 
 . 
 Map 
 ( 
 document 
 . 
 getElementById 
 ( 
 "map" 
 ), 
  
 { 
  
 zoom 
 : 
  
 8 
 , 
  
 center 
 : 
  
 { 
  
 lat 
 : 
  
 63.333 
 , 
  
 lng 
 : 
  
 - 
 150.5 
  
 }, 
  
 // Denali. 
  
 mapTypeId 
 : 
  
 "terrain" 
 , 
  
 }); 
  
 const 
  
 elevator 
  
 = 
  
 new 
  
 google 
 . 
 maps 
 . 
 ElevationService 
 (); 
  
 const 
  
 infowindow 
  
 = 
  
 new 
  
 google 
 . 
 maps 
 . 
 InfoWindow 
 ({}); 
  
 infowindow 
 . 
 open 
 ( 
 map 
 ); 
  
 // Add a listener for the click event. Display the elevation for the LatLng of 
  
 // the click inside the infowindow. 
  
 map 
 . 
 addListener 
 ( 
 "click" 
 , 
  
 ( 
 event 
 ) 
  
 = 
>  
 { 
  
 displayLocationElevation 
 ( 
 event 
 . 
 latLng 
 , 
  
 elevator 
 , 
  
 infowindow 
 ); 
  
 }); 
 } 
 function 
  
 displayLocationElevation 
 ( 
 location 
 , 
  
 elevator 
 , 
  
 infowindow 
 ) 
  
 { 
  
 // Initiate the location request 
  
 elevator 
  
 . 
 getElevationForLocations 
 ({ 
  
 locations 
 : 
  
 [ 
 location 
 ], 
  
 }) 
  
 . 
 then 
 (({ 
  
 results 
  
 }) 
  
 = 
>  
 { 
  
 infowindow 
 . 
 setPosition 
 ( 
 location 
 ); 
  
 // Retrieve the first result 
  
 if 
  
 ( 
 results 
 [ 
 0 
 ]) 
  
 { 
  
 // Open the infowindow indicating the elevation at the clicked position. 
  
 infowindow 
 . 
 setContent 
 ( 
  
 "The elevation at this point <br>is " 
  
 + 
  
 results 
 [ 
 0 
 ]. 
 elevation 
  
 + 
  
 " meters." 
 , 
  
 ); 
  
 } 
  
 else 
  
 { 
  
 infowindow 
 . 
 setContent 
 ( 
 "No results found" 
 ); 
  
 } 
  
 }) 
  
 . 
 catch 
 (( 
 e 
 ) 
  
 = 
>  
 infowindow 
 . 
 setContent 
 ( 
 "Elevation service failed due to: " 
  
 + 
  
 e 
 ), 
  
 ); 
 } 
 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>Elevation Service</title>

    <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 script 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. See
      https://developers.google.com/maps/documentation/javascript/load-maps-js-api
      for more information.
      -->
    <script
      src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=weekly"
      defer
    ></script>
  </body>
</html>  

Try Sample

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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 
 - 
 elevation 
 - 
 simple 
  
 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 
 
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