[Tilesathome] Status of lowzoom?

[spaetz]

On Tue, Sep 11, 2007 at 01:30:14PM +0200, Hakan Tandogan wrote:

> The last mail I read about the new-and-improved lowzoom was written on 16
> August. Is the development stalled or is everyone concentrating on the new
> 0.5 API?

Theoretically, it's ready for deployment, IMHO; I have just been busy with other stuff. There are some problems, namely that coastline prblems are magnified (see the experimental lowzoom layer for Norway for an impressive example). Etienne fixed some problems with fetching ways around the Meridian, so we should be fetching all ways now.

There is one remaining issue on whether we should treat a z8-z11 tileset as a low-zoom tileset, just as we do with regular tilesets currently. it would save us quite some metadata, if we could cluster those together. This has not been implemented in the t at h server though. It would be cool if OJW could comment on whether that would be ok for him.

The second issue is that it would make sense to have a low-zoom render queue, just like we have with the normal requests. In the optimal case this queue would be automatically be populated by the server when it notices that a high zoom tile has been modified, but in the beginning a manual re-request should probably be possible too.

> I stopped building lowzoom tiles about two months ago, I'd like to know
> whether it makes sense to restart using the "old" script.

The *new* lowzoom is likely to produce z8-z11 tiles. So we'll have to think who and how z0-z7 are going to be stitched together anyway. I have no opionion on this one. I think it would suffice if one or two dedicated scripts would do it to avoid overlap.

but all in all, it's just that somebody will decide it's time to turn them on. :-) (a t at h instance can only render regular *or* lowzoom, depending on its configuration).

spaetz
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