[OpenLayers-Users] [Geoserver-users] Problem with GWC and tile alignment but only affecting some zoom levels.

Tue Sep 18 20:05:06 PDT 2012

This is SEEMS to beOpenLayers issue not a Geoserver issue. I have 
reported bug complete with minimal code for reproducing it.
However, this URL
http://maps.gns.cri.nz/geoserver/wms?LAYERS=gns%3APETROLEUM.IWI_BOUNDARIES&FORMAT=image%2Fpng&TRANSPARENT=TRUE&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG%3A900913&BBOX=18785164.06875,-4642705.18625,19411336.204375,-4016533.050625&WIDTH=256&HEIGHT=256

produces a different image to this one (identical BBOX)
http://maps.gns.cri.nz/geoserver/wms?LAYERS=gns%3APETROLEUM.IWI_BOUNDARIES&FORMAT=image%2Fpng&TILED=TRUE&TILESORIGIN=-20037508.34%2C-20037508.34&TRANSPARENT=TRUE&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG%3A900913&BBOX=18785164.06875,-4642705.18625,19411336.204375,-4016533.050625&WIDTH=256&HEIGHT=256

Ie the lower one has tiled=true (and tile origin stated though it 
produces exactly the same image whether tileorigin parameter is present 
or not).
Its a public geoserver instance. This one is 2.1.3, but I get identical 
behaviour 2.1.4 server.

https://github.com/openlayers/openlayers/issues/688

Minimal HTML for reproducing bug.
<html xmlns="http://www.w3.org/1999/xhtml"><head>
<meta http-equiv="imagetoolbar" content="no">
<title>test:PETROLEUM.IWI_BOUNDARIES EPSG:900913 image/png</title>
<style type="text/css">
body { font-family: sans-serif; font-weight: bold; font-size: .8em; }
body { border: 0px; margin: 0px; padding: 0px; }
#map { width: 85%; height: 85%; border: 0px; padding: 0px; }
</style>
<script 
src="http://data-uat/JsLibrary/OpenLayers-2.12/OpenLayers.js"></script>
<script src="http://maps.google.com/maps/api/js?v=3&sensor=false"></script>
<script type="text/javascript">
var map, demolayer;
   // sets the chosen modifiable parameter
   function setParam(name, value){
    str = "demolayer.mergeNewParams({" + name + ": '" + value + "'})"
    // alert(str);
    eval(str);
   }
OpenLayers.DOTS_PER_INCH = 90.71428571428572;
OpenLayers.Util.onImageLoadErrorColor = 'transparent';
function init(){
var mapOptions = {
  resolutions: [156543.03390625, 78271.516953125, 39135.7584765625, 
19567.87923828125, 9783.939619140625, 4891.9698095703125, 
2445.9849047851562, 1222.9924523925781, 611.4962261962891, 
305.74811309814453, 152.87405654907226, 76.43702827453613, 
38.218514137268066, 19.109257068634033, 9.554628534317017, 
4.777314267158508, 2.388657133579254, 1.194328566789627, 
0.5971642833948135, 0.29858214169740677, 0.14929107084870338, 
0.07464553542435169, 0.037322767712175846, 0.018661383856087923, 
0.009330691928043961, 0.004665345964021981, 0.0023326729820109904, 
0.0011663364910054952, 5.831682455027476E-4, 2.915841227513738E-4, 
1.457920613756869E-4],
         units: "m",

projection: new OpenLayers.Projection('EPSG:900913'),
maxExtent: new 
OpenLayers.Bounds(-2.003750834E7,-2.003750834E7,2.003750834E7,2.003750834E7),
controls: []
};
msex = new OpenLayers.Bounds(-20037508.34, -8399738, 20037508.34, 
20037508.34);
map = new OpenLayers.Map('map', mapOptions );
map.addControl(new OpenLayers.Control.PanZoomBar({
         position: new OpenLayers.Pixel(2, 15)
}));
map.addControl(new OpenLayers.Control.Navigation());
map.addLayer(new OpenLayers.Layer.Google("Google Street", {
             type: google.maps.MapTypeId.ROADMAP,
             sphericalMercator: true,
             numZoomLevels: 20,
             wrapDateLine: true,
             visible:true,
             isBaseLayer:true
         }));
demolayer = new OpenLayers.Layer.WMS(
"gns:PETROLEUM.IWI_BOUNDARIES","http://maps.gns.cri.nz/geoserver/wms",
{layers: 'gns:PETROLEUM.IWI_BOUNDARIES', format: 'image/png',
tiled:true, tilesOrigin : map.maxExtent.left + ',' + map.maxExtent.bottom,
   transparent:true },
{
     tileSize: new OpenLayers.Size(256,256),
                 wrapDateLine: true,
                 isBaseLayer: false,
                 displayOutsideMaxExtent: false,
                 maxExtent:msex,
                 displayInLayerSwitcher: true,
});
map.addLayer(demolayer);
var p4326 = new OpenLayers.Projection("EPSG:4326");
var p900913 = new OpenLayers.Projection("EPSG:900913");
nzArea = new OpenLayers.Bounds(161.0, -50.0, 179.99, -31.0);
nzArea.transform(p4326, p900913);

map.zoomToExtent(nzArea);
}
</script>
</head>
<body onload="init()">
<div id="params"></div>
<div id="map"></div>
<div id="nodelist"></div>
</body>
</html>

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