Andreas, Check out http://mapserver.org/output/tile_mode.html. It mentions the parameter "tile_map_edge_buffer". That addresses the issue you are experiencing. However, this is only available from MapServer 6, whereas you are using mapserver 5.6.5.
You may want to defer this operation to a cache renderer ,e.g. TileCache or MapProxy. You can configure these in such a way that they will request an image slightly bigger than 256x256 and will cut out a map tile at 256x256. Furthermore, for labelling purposes these cache renderers typically request even larger images (e.g. 1300*1300), cut off a 10 pixel border to counter the effects your are experiencing and then slice the remaining image 1280x1280 into 25 map tiles 256x256. This cache renderers prove these advantages: - less requests to MapServer at rendering time (only 1 large one instead of 25 small ones) - better labelling - no map tile creation upon each request, but map tiles are simply delivered from cache. Hope this helps. Kind regards, Edward > From: [email protected] > To: [email protected] > Date: Fri, 18 Nov 2011 00:44:03 +0200 > Subject: [mapserver-users] circular symbol for roads at border of tiles > > Hi all, > > I am using mapserver 5.6.5, as installed on Debian stable, to render > tiles (WMS) to an OpenLayers map. Streets are rendered with a circular > symbol. Roads going across tile borders do have at the border a circle > visible. Please see picture at: > > http://andreas.menturagroup.com/MapTilesProblem.jpg. > > I understand what is happening, and why. Is there any way to avoid this, > or a better way of rendering streets? > > Thanks, > > Andreas > > > Here my SYMBOL definition and the styles: > > SYMBOL > NAME "line_solid" > TYPE ellipse > POINTS 1 1 END > FILLED true > END > > > Then for the streets layer I have defined the following styles: > > STYLE > SYMBOL 'line_solid' > COLOR 130 130 130 > SIZE 12 > END > STYLE > SYMBOL 'line_solid' > COLOR 255 255 200 > SIZE 10 > END > > > > MapServer version 5.6.5 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP > OUTPUT=SWF OUTPUT=SVG SUPPORTS=PROJ SUPPORTS=AGG SUPPORTS=FREETYPE > SUPPORTS=ICONV SUPPORTS=FRIBIDI SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT > SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER > SUPPORTS=SOS_SERVER SUPPORTS=FASTCGI SUPPORTS=THREADS SUPPORTS=GEOS > SUPPORTS=RGBA_PNG INPUT=EPPL7 INPUT=POSTGIS INPUT=OGR INPUT=GDAL > INPUT=SHAPEFILE > > > -- > \_________________________________________________________________ > Dipl.-Ing. Andreas Heckwolf Voice : +358 40 5847 445 > Mentura Group Oy Fax: +358 424480 800 > Lönnrotinkatu 32 A 26 00180 Helsinki www.menturagroup.com > > _______________________________________________ > mapserver-users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/mapserver-users
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