[mapserver-users] Label text always clipped by tiles

[Mike Stoddart]

I have three layers; polygon, line and text (point). I get better
results when I combine all three layers into one OpenLayer layer than
when I move the text layer into its own OpenLayer layer. But I'm
seeing fewer partials.

Thanks
Mike

On Wed, Jan 26, 2011 at 2:46 PM, Jean-François Gigand
<jean-francois at gigand.fr> wrote:
> Hi,
>
> 2011/1/26 Gregor at HostGIS <gregor at hostgis.com>:
>>> My problem is that I need ALL labels to be complete and visible.
>>
>> I don't think that's possible if you're using tiles. Somewhere, some label
>> will be close to a tile boundary and be truncated or omitted.
>
> I think it is possible! Because setting a "big enough" metaBuffer will
> make all labels "far enough" from tile boundaries (since the
> metaBuffer artificially extends tile boundaries).
>
> What about the "labelcache_map_edge_buffer" metadata option of
> MapServer the TileCache doc talks about ?
> (http://tilecache.org/docs/README.html)
> I could not find good doc about it.
>
> However, it should not be needed. Try setting the metaBuffer quite big
> (more than 20, say 100 as a test).
> Disable metaTile to keep things simple for the test.
>
> Enable MapServer logging and check the GetMap dimensions requested by TileCache.
> Requesting TileCache for 256px with metaBuffer=100 should generate
> MapServer GetMap requests with width and height of 456px.
> Also, make sure PIL has no problem cropping the image back to 256px.
> Check the interlaced PNG issue
> (http://tilecache.org/docs/README.html).
>