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I have an openlayers based web app, map object is initalized like this:

p4326 = new OpenLayers.Projection('EPSG:4326');
p3857 = new OpenLayers.Projection('EPSG:3857');

//initialize map object, bind it to map_canvas div
map = new OpenLayers.Map('map_canvas', 
    {
    //allOverlays: true,
    projection: p3857,
    displayProjection: p4326,
    maxExtent: new OpenLayers.Bounds(-20037508.3427892,-20037508.3427892,20037508.3427892,20037508.3427892), 
    numZoomLevels:20, 
    maxResolution:156543.0339,
    units:'m', 
    projection: p3857});

I have a prerendered map from levels 8-16, however, in order to view zoom level 16 of the map, i have to initialize its layer like this:

var osm = new OpenLayers.Layer.XYZ("OSM Mapnik", "http://localhost/osm_tiles/osm/${z}/${x}/${y}.png", { isBaseLayer: true, sphericalMercator: true, numZoomLevels: 17});
map.addLayer(osm);

Notice, that i set the zoom level 17 (or i cant zoom and view level 16 of the map). Can someone tell me why?

share|improve this question
    
Does your backend support it? The rendering server needs to be setup accordingly! –  Styp Oct 1 '12 at 19:29
    
Rendering was ok. I ll check what are the values of map object with firebug –  U2ros Oct 1 '12 at 19:56
2  
need to count up from 0 so 17 will equal zoom level 16. (it is part of the api not because your tiles are starting from level 8). –  Mapperz Oct 1 '12 at 21:01
    
@mapperz: thanks, i forgot i should consider the argument as index –  U2ros Oct 2 '12 at 6:51

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