[OpenLayers-Dev] tiling with watermarks + labels

Christopher Schmidt crschmidt at metacarta.com
Mon May 7 15:19:13 EDT 2007

On Mon, May 07, 2007 at 07:24:06PM +0200, Emanuel Sch?tze wrote:
> 1. Some WMS create for _any_ map a scalebar, logo or watermark. If you use 
> tiling, it looks really terrible: look at the demos [1] and [2].
> Are there already any proposals to solve this problem?

Don't use WMSes which do that :)

> 2. Another problem of tiling are labels. If you have a label, which overlaps 
> the tile border, it will clip and doesn't continue in the neighbor tile. Demo 
> [1] shows this effect.
> Anybody already disussed some new methods to improve this?

Sure. That's what meta tiling in TileCache fixes. Same with ka-Map.
(PARTIALS OFF helps in MapServer.) Mapnik changes the problem by using
geographic-based label locations (rather than tile-based), so that the
problem is different -- you just have to make sure your tiles are always
big enough (before you save them) that you can catch any thing that
might lie across an edge. 

Christopher Schmidt

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