[mapserver-dev] mapcache WMTS: offset on some zoom levels

[thomas bonfort]

If you use the map+layer javascript definitions as copy-pasted from
the demo interface, does the offset still exist?

--
thomas

On Thu, Sep 29, 2011 at 11:48, Mathias Walker <mwa at sourcepole.ch> wrote:
> Hello
>
> While setting up a mapcache WMTS for EPSG:21781 I noticed that the tile data
> on some zoom levels is offset to the reference data when loading it with
> OpenLayers. If I load the same layer as mapcache TMS all zoom levels are
> correctly aligned.
> Am I missing some configuration options or are there some issues in the WMTS
> calculation?
>
> OpenLayers uses the same extent and resolutions as the mapcache config.
> The following zoom levels are offset for WMTS in my setup:
> (0 - 6 unknown) 7, 8, 9, 10, 12, 13, 14, 15, 17, 19, 24
>
> Here are my settings:
>
> mapcache.xml grid:
>
>  <grid name="CH1903">
>    <metadata>
>      <title>CH1903 / LV03</title>
>    </metadata>
>    <srs>EPSG:21781</srs>
>    <units>m</units>
>    <extent>420000,30000,900000,350000</extent>
>    <resolutions>4000,3750,3500,3250,3000,2750,2500,2250,2000,1750,1500,1250,1000,750,650,500,250,100,50,20,10,5,2.5,2,1.5,1,0.5</resolutions>
>    <size>256 256</size>
>  </grid>
>
> OpenLayers:
>
>  var options = {
>    controls: [],
>    projection: new OpenLayers.Projection("EPSG:21781"),
>    units: "m",
>    maxExtent:  new OpenLayers.Bounds.fromArray([420000,30000,900000,350000]),
>    restrictedExtent:  new
> OpenLayers.Bounds.fromArray([420000,30000,900000,350000]),
>    resolutions:
> [4000,3750,3500,3250,3000,2750,2500,2250,2000,1750,1500,1250,1000,750,650,500,250,100,50,20,10,5,2.5,2,1.5,1,0.5],
>    allOverlays: false
>  };
>  var map = new OpenLayers.Map("map", options);
>
>  map.addLayer( new OpenLayers.Layer.WMTS({
>      name: "Bezirksgrenzen WMTS",
>      url: "http://???.sourcepole.ch/mapcache/wmts/",
>      layer: 'bezirksgrenzen',
>      matrixSet: 'CH1903',
>      format: 'image/png',
>      style: 'default',
>      buffer:0,
>      isBaseLayer:false,
>      maxExtent: new OpenLayers.Bounds(420000,30000,900000,350000)
>    }
>  ));
>
>  map.addLayer( new OpenLayers.Layer.TMS(
>    "Bezirksgrenzen TMS",
>    "http://???.sourcepole.ch/mapcache/tms",
>    {
>      layername: "bezirksgrenzen",
>      type: "png",
>      isBaseLayer: false,
>      buffer: 0,
>      visibility: true
>    }
>  ));
>
>
> Best regards
> Mathias Walker
> --
> Sourcepole - Linux & Open Source Solutions
> Churerstrasse 22, 8808 Pfäffikon SZ, Switzerland
> Tel: 044 440 77 11  Fax: 044 440 77 12
> mwa at sourcepole.ch  http://www.sourcepole.ch
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