[mapserver-users] circular symbol for roads at border of tiles

[Edward Mac Gillavry]

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: andreas.heckwolf at menturagroup.com
> To: mapserver-users at lists.osgeo.org
> 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
> 
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