[Openstreetmap] Re: [Openstreetmap-dev] Cache the whole world.

[David Sheldon]

On Thu, Feb 16, 2006 at 08:14:51AM +0100, Erik Johansson wrote:
> The other problem with invalidating is that there are lots of zoom
> levels. Why not disabling the Landsat for zoom 16,17,18, or completly?
> I'm not even sure you need landsat for zoom 15.

Given that the landsat for zoom 15-18 is just a scaled version of that for
zoom 14, I think the best way would be to make all of the clients use
the zoom 14 landsat tile, and scale it themselves. At zoom 17 a single
zoom 14 tile should cover the whole screen, thus reducing the number of
tile requests, and limiting it to those already cached at the earlier
zoom.

Does anyone know if there will be problems with projections and making
them line up with the streets/gpx points? For the slippy map a precurser
to this would be to work out how to use transparent PNGs for the
streets. This could allow us to have the clients request the landsat
from NASA which I think we've looked at before.

David
-- 
If you give a man a fire, he'll be warm for a day. If you set a man on fire, 
he'll be warm for the rest of his life.