[OSM-dev] Slippy map and zoom

Christopher Schmidt crschmidt at metacarta.com
Fri Feb 15 14:51:50 GMT 2008

On Thu, Feb 14, 2008 at 01:06:32PM +0000, Tom Hughes wrote:
> In message <Pine.LNX.4.64.0802141201220.13951 at localhost.localdomain>
>         Lars Aronsson <lars at aronsson.se> wrote:
> > When I use the scroll wheel to zoom in and out of the slippy map, 
> > whether on www.openstreetmap.org, maps.yahoo.com, or 
> > maps.google.com, the screen goes blank for a short while before 
> > the tiles of the new zoom level arrive.  At Google Maps, some red 
> > corners move about showing whether I'm zooming in or out.
> >
> > Would it be possible, in JavaScript, to show the existing tiles, 
> > rescaled by the browser, until the new tiles arrive?
> When OpenLayers can do that, then yes we will do it. As it happens
> that is going to be in the next release I believe.


> > If this was possible, I guess the browser could also emulate finer 
> > grades (half-levels) of zooming.  It would make for a less bumpy 
> > user experience.
> That is also something that the next release of OL is expected to
> be able to do I believe.

Not for OSM tiles: fractional zoom is only for services that allow
arbitrary bbox requests.

Christopher Schmidt

More information about the dev mailing list