[OpenLayers-Users] Users Digest, Vol 8, Issue 38

[Tim Schaub]

Hey-

Jeff Yutzler wrote:
> Tim,
> This workaround works fine at large scale, but unfortunately it 
> completely breaks down at small scale.  When I try it at 1:433k, 1:216k, 
> or 1:108k, I get even thicker white lines.  Oh well.  I have Ionic's 
> RedSpiderWeb team looking at it.
> Thanks for trying.
> -Jeff

Hmm.  Perhaps they fixed something.  I only see 2px (at most) white 
edges regardless of scale.  You can always use bigger gutters.  In any 
event, the right thing to do is get it fixed at the source.

Tim


>> > When I set the following WMS layer into OpenLayers:
>> > >    map.addLayer(new OpenLayers.Layer.WMS( "IONIC Natural Earth 
>> WMS", > "http://demo.ionicenterprise.com/ionicweb/map/NATURALEARTH", 
>> {layers: > 'NATURALEARTH'}));
>> > > I get behavior I have not seen anywhere else.  At most scales, the 
>> layer > looks fine.  However, at 1:3M and 1:7M, white vertical lines 
>> appear at > the tile boundaries.  I suppose this is a defect in 
>> OpenLayers, but I'm > not really even sure how to describe it.  Any 
>> ideas?
>>   
> 
> For tile renderers (WMS servers) that have unsavory edge effects, you 
> can use the "gutter" option on a layer.  This requests a larger tile 
> than is actually displayed in OpenLayers - hiding ugly tile edges if you 
> can't control the tiling yourself (with TileCache).
> 
> This functionality was introduced during 2.4 development and will be 
> included in the 2.4 release.  (See http://trac.openlayers.org/ticket/529 
> for details.)
> 
> In your case, the following layer definition gets rid of the white tile 
> edges:
> 
>   var iconic = new OpenLayers.Layer.WMS("IONIC Natural Earth WMS",
>       "http://demo.ionicenterprise.com/ionicweb/map/NATURALEARTH",
>       {layers: 'NATURALEARTH'},
>       {gutter: 2});
> 
>   map.addLayer(iconic);
> 
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