[Tilesathome] tiles at home = mission impossible?

[Christopher Schmidt]

On Sat, Apr 12, 2008 at 10:48:07PM +0200, Frederik Ramm wrote:
> Hi,
> 
> > if I understand it right, lowzoom now works like this:
> 
> I think you don't understand it right ;-)
> 
> > Generating levels 8-11 tries to read zoom 12 'captionless' for all needed
> > tiles.
> 
> True.
> 
> > The servercode "sees" that most zoom 12 'captionless' are missing
> > and requests rendering for zoom 12.
> 
> False.

No, True.

> The lowzoom process does not create render requests. If it downloads a
> tile that isn't there, that's a white spot on the lowzoom tile. At
> least that was the case last time I looked, which admittedly is some
> time ago...

Any time there is a request for a z12 tile that doesn't exist on the
server, a priority 3 request is created for the tileset.   

> > The client renders zoom 12
> > 'captionless' (which is needed) + zoom 12-17 'tile' (which are not needed
> > but use most space and time).

Yep.

> These are only rendered if explicitly requested, not as part of a
> lowzoom process.

Viewing missing tiles is an explicit request, in the mind of the t at h
server. 

Regards,
-- 
Christopher Schmidt
MetaCarta