[OSM-talk] osmarender slippy map rendering

[Frederik Ramm]

Hi,

> 2. Tiles at home renders place=city as grey text at zoom=12, which
> means it should be black at zoom=11.  But t at h doesn't go that far.
> Instead, zoom=11 is created by lowzoom.pl by scaling down the
> zoom=12 image.

I talked with someone about this in Essen (probably Deelkar? not  
sure). Our idea was to do the following in tiles at home:

* Create a new layer, called "lowzoombase" or something like that,  
which has only zoom level 12 and uses a much simplified stylesheet  
compared to the one used for level 12 proper.
* Whenever a t at h client renders a tile, have it also render the  
level-12 tile for "lowzoombase" and upload it to the server, at a  
minimal additional performance and storage cost.
* "lowzoombase" tiles are not meant for viewing them directly, they  
are just fodder for lowzoom.pl.
* Modify lowzoom.pl to use scaled-down "lowzoombase" images instead  
of scaled-down standard level-12 images as the basis for level 11 and  
smaller tiles.

Of course this only shifts the problem one level further up, but I  
think it would help a lot. We could drop minor roads and ways from  
the "lowzoombase", and enhance motorways and rivers, and also handle  
city names suitably.

All this can be done with the existing infrastructure, it'd only be a  
small change to lowzoom.pl, the t at h config files and configuring of a  
new layer on the server.

Bye
Frederik

-- 
Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00.09' E008°23.33'