Add an example for using an Esri 512x512 tile server in EPSG:4326

[bartvde]

This shows how to use http://services.arcgisonline.com/arcgis/rest/services/esri_imagery_world_2d/mapserver in ol3.

So currently XYZ sources can only be used with 256x256 right?

[bartvde]

but I do recall discussion (in the ol3 hangout) about adding tileSize to sources, has this already happened or not as yet?

[elemoine]

Yes: https://github.com/openlayers/ol3/blob/master/src/ol/source/xyzsource.js#L26

[bartvde]

ah right, thanks @elemoine then probably the apidoc hasn't been updated in a while:

http://openlayers.org/en/master/apidoc/ol.source.XYZ.html

[bartvde]

What am I missing here that this does not achieve the same:

var map = new ol.Map({
  target: 'map',
  layers: [
    new ol.layer.Tile({
      extent: projectionExtent,
      source: new ol.source.XYZ({
        url: 'http://services.arcgisonline.com/arcgis/rest/services/ESRI_Imagery_World_2D/MapServer/tile/{z}/{y}/{x}',
        attributions: [attribution],
        resolutions: resolutions,
        projection: projection,
        tileSize: 512
      })
    })
  ],
  view: new ol.View({
    center: [0, 0],
    projection: projection,
    zoom: 2,
    minZoom: 2
  })
});

[bartvde]

okay maybe this still needs a custom tile url function since it's not a simple x/y/z replace ?

[elemoine]

The problem may be related to the fact that an XYZ source (and XYZ tile grid) does not take resolutions. And in your case you need a specific resolutions array. This example is useful I think. Please merge if you also think that using an XYZ source is not possible in that case. Also, comment about that in the example's code may be useful.