[OpenLayers-Users] Vertical lines on WMS layer?

[Tim Schaub]

Jeff Yutzler wrote:
> 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);

Nice looking map!  Obviously, the best solution is to fix the Iconic WMS 
- until that is done, use gutters.

Tim

http://wms-sites.com/catalog/Natural-Earth-draped-over-SRTM/NATURALEARTH/



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