[OSM-talk] osmarender slippy map rendering
frederik at remote.org
Thu Apr 26 10:12:26 BST 2007
> 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
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.
Frederik Ramm ## eMail frederik at remote.org ## N49°00.09' E008°23.33'
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