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Maximum Zoom Imagery Service

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Page Summary

This webpage demonstrates a Google Maps application showcasing the Maximum Zoom Imagery Service.
Users can click on the map of metropolitan Tokyo to view the maximum zoom level available at that specific location.
The application utilizes the google.maps.MaxZoomService to retrieve and display the maximum zoom level data.
The provided code snippets include implementations in both TypeScript and JavaScript, along with HTML and CSS for styling and structure.

This example creates a map of metropolitan Tokyo. If the user clicks on the map, a popup window indicates the maximum zoom level at that location.

Read the documentation.

[フレーム]

TypeScript

letmap:google.maps.Map;
letmaxZoomService:google.maps.MaxZoomService;
letinfoWindow:google.maps.InfoWindow;
functioninitMap():void{
map=newgoogle.maps.Map(document.getElementById("map")asHTMLElement,{
zoom:11,
center:{lat:35.6894,lng:139.692},
mapTypeId:"hybrid",
});
infoWindow=newgoogle.maps.InfoWindow();
maxZoomService=newgoogle.maps.MaxZoomService();
map.addListener("click",showMaxZoom);
}
functionshowMaxZoom(e:google.maps.MapMouseEvent){
maxZoomService.getMaxZoomAtLatLng(
e.latLngasgoogle.maps.LatLng,
(result:google.maps.MaxZoomResult)=>{
if(result.status!=="OK"){
infoWindow.setContent("Error in MaxZoomService");
}else{
infoWindow.setContent(
"The maximum zoom at this location is: "+result.zoom
);
}
infoWindow.setPosition(e.latLng);
infoWindow.open(map);
}
);
}
declareglobal{
interfaceWindow{
initMap:()=>void;
}
}
window.initMap=initMap;index.ts

JavaScript

letmap;
letmaxZoomService;
letinfoWindow;
functioninitMap(){
map=newgoogle.maps.Map(document.getElementById("map"),{
zoom:11,
center:{lat:35.6894,lng:139.692},
mapTypeId:"hybrid",
});
infoWindow=newgoogle.maps.InfoWindow();
maxZoomService=newgoogle.maps.MaxZoomService();
map.addListener("click",showMaxZoom);
}
functionshowMaxZoom(e){
maxZoomService.getMaxZoomAtLatLng(e.latLng,(result)=>{
if(result.status!=="OK"){
infoWindow.setContent("Error in MaxZoomService");
}else{
infoWindow.setContent(
"The maximum zoom at this location is: "+result.zoom,
);
}
infoWindow.setPosition(e.latLng);
infoWindow.open(map);
});
}
window.initMap=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>Maximum Zoom Imagery 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>index.html

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.

gitclone-bsample-maxzoom-simplehttps://github.com/googlemaps/js-samples.git
cdjs-samples
npmi
npmstart

Other samples can be tried by switching to any branch beginning with sample-SAMPLE_NAME.

gitcheckoutsample-SAMPLE_NAME
npmi
npmstart