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I'm using GeoXml3 to parse XML files in Google Map and would like to add OSM as custom maptype. I fiddled with this example but it hides completely the original Google layers.

I've found a couple of other examples but unfortunately all of them are using the V2 API.

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Could you please provide a sample page of what you want (even it uses google v2 api)? – simo Sep 22 '11 at 10:23
A V2 more complex example – elbatron Sep 22 '11 at 10:46
pastebin modified code from OSM wiki. It displays Google Map controls with OSM layer, but switching maptypes doesn't work. – elbatron Sep 22 '11 at 10:49
Ok, maybe your question is a duplicate of… – simo Sep 22 '11 at 12:12
I've seen that post and the answer. I would like to use OSM a maptype and not just part of it (e.g road layer). I think my pastebin example is almost there... – elbatron Sep 22 '11 at 12:20
up vote 6 down vote accepted

Here is a working example. I based this off of your pastebin code and this example in Google's doc.

Your code was missing the maxZoom parameter in the mapTypeOptions object; which is a required parameter. See:

Google Doc (under MapType interface header)

OSM Doc, under 'Example - Using Google Maps API v3 setting OSM as a base map layer' header:

Note that you need to set maxZoom in the ImageMapType for it to work as a base layer.

Here is the js code:

var osmMapTypeOptions = {
getTileUrl: function(coord, zoom) {
    return "" +
    zoom + "/" + coord.x + "/" + coord.y + ".png";
    tileSize: new google.maps.Size(256, 256),
    isPng: true,
    maxZoom: 19,
    minZoom: 0,
    name: "OSM"

var osmMapType = new google.maps.ImageMapType(osmMapTypeOptions); 
var map;

function initialize(){

var latlng = new google.maps.LatLng(57, 21);
var mapOpts = {
    zoom: 3,
    center: latlng,
    panControl: true,
    scaleControl: true,
    mapTypeControlOptions: {
        mapTypeIds: ['OSM',google.maps.MapTypeId.ROADMAP],
        style: google.maps.MapTypeControlStyle.DROPDOWN_MENU
    zoomControl: true,
    zoomControlOptions: {
        style: google.maps.ZoomControlStyle.SMALL

map = new google.maps.Map(document.getElementById("map"), mapOpts);
map.mapTypes.set('OSM', osmMapType);
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