[Tilesathome] t at h server next generation

[spaetz]

On Thu, Jul 10, 2008 at 11:32:24PM -0700, Alan Millar wrote:
> > captionless is only z12
> 
> We discussed this recently and came to the conclusion that the captionless
> layer should exist for more levels than just z12, so that we could do
> things like support labels in other languages.  See:

Captionless needs only be rendered for z12, it can be stitched together at lower zoom levels, just like the regular lowzooms.


> > But then I plan to not store empty z12 tilesets at
> > all, but have a "blank tileset db" for that (which only has entries for
> > completely empty tilesets). But given that we currently waste tons of
> > diskspace for the millions and millions of files and thousands of
> > directories (which all use up an unknown minimum filesize), I would think
> > that we waste still much less space than we currently do.
> 
> The blank tile database will be the biggest savings in space of anything
> we can do, particulary if it is fully recursive.

It's always a tradeoff of lookups vs the number of entries. Yes, going recursively up to -say- zoom level 6 or so might be feasible. However, given that disk space is not our bottleneck, this is pretty low on my current list.

> If we can't do full recursion, then hopefully we can at least do z6 to
> eliminate 4096 blank z12s.  In addition to the ocean, there is quite a bit
> of Yukon, Greenland, and Siberia that can be stored in blank z6 entries.

Yep, it does make sense in general, however as I said above, there's more urgent things on my list right now.

spaetz