[OpenLayers-Dev] tiling with watermarks + labels

Bill Woodall bwoodall at wardrobe.dhs.org
Mon May 7 15:27:09 EDT 2007

Hi Emanuel,

I see that you have at least two options to address both issues;

	Use WMS.Untiled with parameter 'ratio: 1',
        This option might be painful on the client's bandwidth with the
        large image that is in your example
        Use standard WMS layer and TileCache with MetaTiles,
        This option will slice up the large MetaTile into smaller tiles
        and get a cache as well!
        And with the lastest TC v1.8.1, there is a watermark code in TC

On Mon, 2007-05-07 at 19:24 +0200, Emanuel Schütze wrote:
> Hi,
> there are 2 gerneral problems if you use tiling in tile-based web mapping 
> clients (like OpenLayers):
> 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?
> 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?
> I'm currently writing my thesis about usability in web mapping applications 
> ("smart map browsing") using the example of OpenLayers. Therfor I search some 
> informations about trends and problems of tiling. I'm looking forward to 
> getting your replies. Many thanks in adavance!
> Best regards,
> Emanuel
> [1]http://dev.openlayers.org/sandbox/emanuel/animatedZooming/demo_grass.html
> [2]http://dev.openlayers.org/sandbox/emanuel/animatedZooming/demo_bavaria.html
> PS: Please answer, if possible, to dev at openlayers.org!
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