Tom,

Not something related to GeoServer, but your tiling engine. Check out whether 
you can specify an extra gutter/buffer around the meta-tiles that you request 
from GeoServer. The exact parameter depends on your tiling engine.

Also check out http://permalink.gmane.org/gmane.comp.gis.geoserver.user/21271

Kind regards,

Edward

Date: Wed, 16 May 2012 13:30:05 +0100
From: [email protected]
To: [email protected]
Subject: [Geoserver-users] Point markers that straddle tiles

Hi all,
When using images as point styles I have discovered that if the image straddles 
a tile it will cut off at the edge of the tile. Is there any way to prevent 
this?  The attached image shows a couple of examples of this in action and you 
can see where the edges of the tiles are.  The two icons at the bottom have 
their tops missing (slightly) while the two just to the right and a little 
further up are virtually cut in half!
Incidentally, the attached image also shows that alpha transparency doesn't 
appear to work either.  Each of the images has a border with alpha transparency 
but they are rendered as black.We're using Geoserver 2.1.3 on Windows Server 
2008 32bit.

Tom


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