[OSM-dev] [PATCH] Delete empty t at h tiles on the server

Jeroen Dekkers jeroen at vrijschrift.org
Wed May 2 00:12:42 BST 2007


At Tue, 01 May 2007 20:56:27 +0200,
Frederik Ramm wrote:
> 
> Hi,
> 
>  > With the
> > attached patch those empty tiles get deleted, including all higher
> > zoom level tiles.
> 
> Such a "cascading" deletion is probably incorrect in corner cases where 
> there is something on a tile that only gets rendered at a very high zoom 
> level (e.g. a lone pub node). This will lead to an emtpy Z-13 tile, but 
> doesn't mean that corresponsing Z-17 tiles may be deleted.

Can't we assume that if there are things on Z-17 tiles, there will at
least be something on the higher level zoom tiles?

If that assumption is wrong, then we should also change the t at h
clients, because at the moment they don't generate subtiles of empty
tiles.

Jeroen Dekkers




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