[OSM-dev] OpenStreetMap

[Christopher Schmidt]

On Tue, Nov 20, 2007 at 08:29:19AM +0000, Tom Hughes wrote:
> In message <47426F2A.60505 at graphicsoptimization.com>
>         Derek Tonn <datonn at graphicsoptimization.com> wrote:
> 
> > I have been looking for a ".png" equivalent to Zoomify for quite a
> > while now that I could use to display maps on the web...and since you
> > are doing that very thing with OSM, I figured I would ask you for any
> > advice you might have that could lead me to the ability to create
> > solid "zoom" effects outside of the Zoomify interface.
> 
> Well I'm not familiar with Zoomify but if it does what I think it
> does (animating the effect of zooming the map in and out) then the
> next version of OpenLayers (the map viewer we use) is expected to
> include technology to do such effects.
> 
> There's an example kicking around on the web somewhere that Christopher
> will probably be able to point you at, but basically it does an immediate
> redisplay by scaling the original tiles (either in one jump or as an
> animated zoom) and then loads the new tiles to replace the zoomed image.

Zoomify actually is two things: A tool for chopping up images and
a tool for browsing them. The first is kind of done by TileCache, but
not any more smartly than zoomify. OpenLayers, of course, acts as a
great frontend once you have images chopped up, but I'm not convinced
that post-processing optimizing the images that zoomify creates isn't
the path the OP is looking for.

That said, the link TomH was thinking of was
http://dev.openlayers.org/sandbox/pagameba/transition/examples/transition.html
-- try the 'resize' or 'animate' effects using the layerswitcher (upper
right).

Regards,
-- 
Christopher Schmidt
MetaCarta