1

I am trying to create a WMTS layer in OpenLayers with the following properties:

I am using the projection definition from http://epsg.io/5514 (the default one).

The resulting tiles contain two layers: 1 positioned correctly and another one in the wrong position. Does anyone have idea why is this happening?

enter image description here

Here is also a codepen that I have created https://codepen.io/bampakoa/pen/yWyLog

2

Strange effects can be produced by some reprojections. This is the world with 2 Europes and Africas when projected in EPSG:5514

enter image description here

A simple workaround would be to limit the EPSG:3857 extent of your EPSG:5514 layer when it is reprojected to EPSG:3857

  new ol.layer.Tile({
    opacity: 1,
    extent: ol.proj.transformExtent([10,40,30,60],'EPSG:4326','EPSG:3857'),
    source: new ol.source.WMTS(/** @type {!olx.source.WMTSOptions} */ (options))
  })
  • 1
    Actual extent for EPSG 4326 is [12.09, 47.73, 22.56 ,51.06] (see epsg.io/5514). – TomazicM May 6 at 12:03
  • @TomazicM In some cases a buffer may be useful. Maps sometimes go beyond the defined extent of their projection, e.g. overview maps in EPSG:27700 epsg.io/27700 are usually extended west into negative coordinates to include the whole of Ireland – Mike May 6 at 16:11
  • Thanks, I'll keep that in mind. – TomazicM May 6 at 16:14

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