Display world map with no repeats

javascript google-maps google-maps-api-3

19,342

Solution 1

If you don't want any repeats, you need to control the minimum zoom allowed and the width of your map to be less than or equal to one width of of the base tiles at the minimum zoom level allowed on your map. At zoom zero, one width of the world is a single 256 x 256 pixel tile, each zoom level increases that by a factor of 2.

This will show one width of the map at zoom level 1 (512x512 map-canvas), you can change the height, but the width will need to be 256 at zoom 0, 512 at zoom 1, 1024 at zoom 2, etc:

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
      <style type="text/css">
        html { height: 100% }
        body { height: 100%; margin: 0; padding: 0 }
        #map-canvas { height: 512px; width:512px;}
    </style>
    <script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?v=3&sensor=false">
    </script>
    <script type="text/javascript">
       function initialize() {
          var mapOptions = {
             center: new google.maps.LatLng(-34.397, 150.644),
             zoom: 1,
             minZoom: 1
          };
          var map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);
       }

       google.maps.event.addDomListener(window, 'load', initialize);
    </script>
  </head>
  <body>
   <div id="map-canvas"/>
  </body>
</html>

code snippet:

function initialize() {
  var mapOptions = {
    center: new google.maps.LatLng(-34.397, 150.644),
    zoom: 1,
    minZoom: 1
  };
  var map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);
}

google.maps.event.addDomListener(window, 'load', initialize);

html {
  height: 100%
}

body {
  height: 100%;
  margin: 0;
  padding: 0
}

#map-canvas {
  height: 512px;
  width: 512px;
}

<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>
<div id="map-canvas"></div>

Solution 2

Here's a function worldViewFit I like to use:

function initMap() {
	var mapOptions = {
		center: new google.maps.LatLng(0, 0),
		zoom: 1,
		minZoom: 1
	};
	map = new google.maps.Map(document.getElementById('officeMap'), mapOptions);
	google.maps.event.addListenerOnce(map, 'idle', function() {
		//Map is ready
		worldViewFit(map);
	});
}

function worldViewFit(mapObj) {
	var worldBounds = new google.maps.LatLngBounds(
		new google.maps.LatLng(70.4043,-143.5291),	//Top-left
		new google.maps.LatLng(-46.11251, 163.4288)	 //Bottom-right
	);
	mapObj.fitBounds(worldBounds, 0);
	var actualBounds = mapObj.getBounds();
	if(actualBounds.getSouthWest().lng() == -180 && actualBounds.getNorthEast().lng() == 180) {
		mapObj.setZoom(mapObj.getZoom()+1);
	}
}

google.maps.event.addDomListener(window, 'load', initMap);

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

#officeMap {
  height: 512px;
  width: 512px;
}

<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="officeMap"></div>

19,342

jezzipin

Software developer at Tempcover

Updated on May 25, 2022

Comments

jezzipin almost 2 years

I'm currently using the Google Maps API for the first time. Essentially I wish to have the map zoomed out so that the whole world is displayed with no overlap (e.g. bits of a certain country are not repeated on either side of the map).

The closest I have found to my requirements is this SO question: Google Maps API V3: Show the whole world

However, the top answer on this question does not provide the full code required.

I have used the starter example from Google as the base for my HTML:

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
      <style type="text/css">
        html { height: 100% }
        body { height: 100%; margin: 0; padding: 0 }
        #map-canvas { height: 100% }
    </style>
    <script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCuP_BOi6lD7L6ZY7JTXRdhY1YEj_gcEP0&sensor=false">
    </script>
    <script type="text/javascript">
       function initialize() {
          var mapOptions = {
             center: new google.maps.LatLng(-34.397, 150.644),
             zoom: 1
          };
          var map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);
       }

       google.maps.event.addDomListener(window, 'load', initialize);
    </script>
  </head>
  <body>
   <div id="map-canvas"/>
  </body>
</html>

However, in the example provided in the question above a number of additional variables have been specified. My question is, where do I plug in the code from the question above to ensure that my world map is displayed correctly?

jezzipin over 10 years

This is great however it produces a grey box at the bottom of the map regardless of height. Is there any way of getting rid of this grey box as it looks horrible.
geocodezip over 10 years

You can change the height to be shorter than a multiple of 256, the vertical direction doesn't repeat.
Jochem Schulenklopper about 7 years

@jezzipin: you could also set minZoom to 2, or another higher level, depending on the devices you want to show your map on. Wide screens will indeed show those grey boxes at the top and bottom if the minimum zoom factor is too low.