[mapserver-users] Label text always clipped by tiles

[Mike Stoddart]

Thanks Jean-François, I'll try your solution.

Is this clipping issue only a problem in the AGG renderer or does the
original GD(?) renderer have the same problem.

Thanks
Mike

On Wed, Jan 26, 2011 at 11:00 AM, Jean-François Gigand
<jean-francois at gigand.fr> wrote:
> Hi,
>
> I met the edge issue when I had to produce statistics maps with
> proportional symbols.
>
> TileCache addressed the issue indeed, with the "metaBuffer" option
> (see http://tilecache.org/docs/README.html#configuration).
> It means that MapServer will be called to generate larger tiles which
> are then cropped by TileCache, which has a time processing cost.
>
> The "metaTile" is meant to optimize this by rendering multiple tiles
> as a single one.
>
> Jeff
>
> 2011/1/26 Gregor at HostGIS <gregor at hostgis.com>:
>>> I was using TileCache, but I switched it off to debug this problem. If
>>> TileCache generates larger tiles, will there still be clipped labels?
>>> Just fewer clipped labels? I don't think this is a workable solution
>>> for me, but if I have the time I'll try it.
>>
>> Correct; there would be FEWER labels clipped (if you force them and allow
>> partials) or missing (if you disallow partials).
>>
>> How many fewer, depends on how large you make your meta-tiles. If they're
>> 5x5, that's a significant reduction in the number of tile edges. If you
>> really turn up your MAXSIZE in your mapfile, you could potentially make
>> 10x10 meta-tiles; that's 1% as many tile edges.
>>
>> You could also make your tiles larger. If you have 512x512 tiles, and 10x10
>> meta-tiles, that's a HUGE reduction in the number of tile edges over single
>> 256x256 tiles.
>>
>> The only method I know that would eliminate ALL tile-edge artifacts, would
>> be to eliminate tiling, e.g. singleTile:true in OpenLayers. Not that that's
>> a great solution either, but it is sometimes the only way.
>>
>> --
>> HostGIS, Open Source solutions for the global GIS community
>> Greg Allensworth - SysAdmin, Programmer, GIS Person, Security
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>