[OpenLayers-Users] Overzoom of tiled layers

[Mika Lehtonen]

Hi all,

I know Jukka is using TMS-layer as an overlay on top of Google or what 
so ever layer. I think that the "overzooming" effect could be 
accomplished by doubling the layer's tile size and doing a little fake 
in order to fit 256x256 tile in 512x512 or 1024x1024 div. Maybe there 
are some more elegant ways to handle this, I do not know.

But if we do like I suggested, how could it be done on-fly? I know I can 
make this artificial client side zooming happen adding 
'layer.setTileSize(new OpenLayers.Size( )) while initialising the map. 
But if I do it afterwards, it doesn't seem to be working. I also tried 
removing and adding the layer, redrawing it and couple of other things 
without any success. I added my tilesizing into a function which 
constructs the TMS-url, so everytime the zoomlevel gets over a certain 
limit, the tile size is adjusted. Maybe I am going wrong in this. Should 
I use some event handler? Any ideas?

- mika -

Jukka Rahkonen kirjoitti:
> Hi,
>
> I read through the FAQ and half a years mail archive titles but did not
> find a question for this simple question: Is it possible to zoom over the
> last level of the tiled imagery? Our users should do accurate on-screen
> digitising using images of 0.5 meter pixel size. However, accurate work is
> not possible if one image pixel is mapped to one screen pixel. Is it
> possible to overzoom with Openlayers beyond the last zoom level?  The last
> level is now using the same resolution as the original imagery and
> creating tiles for the next zoom level on the server is not an option.  It
> would only take four times more disk space without improving image
> quality.
>
> -Jukka Rahkonen-
>
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