[OpenLayers-Users] geowebcache tiling zoom and bounds

[Wes Toews]

---------- 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"

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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