[OSM-dev] OSM over Yahoo! Satellite

Andy Allan gravitystorm at gmail.com
Thu Oct 25 20:05:01 BST 2007


On 10/25/07, Dave Stubbs <osm.list at randomjunk.co.uk> wrote:
> On 25/10/2007, Christopher Schmidt <crschmidt at metacarta.com> wrote:
> > On Thu, Oct 25, 2007 at 12:57:03PM +0100, Robert (Jamie) Munro wrote:
> > > Christopher Schmidt wrote:
> > > > http://labs.metacarta.com/osm/over-yahoo/
> > > >
> > > > Opacity slider, and three layers -- the base mapnik layer, the one I
> > > > maintain, and hte t at h layer. (The one I maintain makes no statements
> > > > or gaurentes it will work -- I just like being able to see it when it is
> > > > working.)
> > >
> > > Cool!
> > >
> > > Can we get mapnik to render PNGs with a transparent background (but
> > > using the alpha channel for anti-aliasing, rather than a white
> > > background, and just set the page background to be white?
> >
> > That's a question for someone other than me. I have no experience with
> > Mapnik tobe sure.
>
> It's possible -- but you'd need to create a different tile set.
> Basically you just edit the style file to remove the background
> colour, and then don't let it draw in the coast polygons and possibly
> world boundaries. That would normally suck, but as we have the aerial
> underlay, it's actually what we probably want.
>
> I've done a bit of the cycle layer like this here: (adsl, so maybe
> slow, and also a limited number of tiles)
> http://beerwarmer.randomjunk.co.uk/yahoo-cycle/

How does IE6 cope with this? I didn't think it could handle variable
alpha levels in .pngs. If it can, then coolio.

Andy




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