[OpenLayers-Users] geowebcache tiling zoom and bounds

[Christopher Schmidt]

On Wed, Sep 10, 2008 at 09:57:33AM -0700, Wes Toews wrote:
> ---------- Forwarded message ----------
> From: Wes Toews <wolfsnipes at gmail.com>
> Date: 10 Sep 2008 09:56
> Subject: geowebcache tiling zoom and bounds
> To: geoserver-users at lists.sourceforge.net
> 
> hi, I have an issue with openlayers/gwc integration.  I have built an
> application using gwc, openlayers and geoserver, and it works fine except
> for implementing the getfeatureinfo request.  When clicking on a map
> feature, I receive the documented problem of:
> 
> "The bounds result in a zoom level of 6.359755367181556, expected something
> within 0.05 of an integer, check
> -115.386772,51.632202,-111.003228,54.367798"

GeoWebCache probably doesn't support GetFeatureInfo. (TileCache
doesn't.) 

> I have read the documentation on this, set the maxResolution parameter to
> 0.703125 as recommended in the documentation; as well I've played
> with combinations of zoom levels and maxResolutions, starting zoom and
> maxResolution parameters.  The resulting tiles are 256x256 pixels size.
> 
> my openlayers code looks something like this:
> 
>     var mapOptions = {
>      maxExtent: new OpenLayers.Bounds(-180,-90,90,180),
>      units: 'degrees',
>      projection: "EPSG:4326",
>      maxResolution: 0.703125
>      };
> 
>     function OLMapInit()
>     {
>      map = new OpenLayers.Map('map', mapOptions);
> 
>      var myLayer = new OpenLayers.Layer.WMS("TRSI Projects","
> http://localhost:8080/geowebcache/service/wms",
>      {
>       layers: 'TerraWorld',
>       format: 'image/png'
>      });
> 
>      map.addLayer(myLayer);
>      map.zoomToExtent(initialZoomExtents);
> 
>      //map.zoomToMaxExtent();
> 
> The getfeatureinfo request is standard stuff borrowed from the Geoserver
> example code, nothing changed.  This generates the zoom level error cited
> above.  Any ideas?
> 
> Thanks in advance,
> 
> -Wes

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-- 
Christopher Schmidt
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