[OSM-talk] Mapnik Lowzoom TIles - proof of concept

[colliar]

Am 04.07.2013 11:18, schrieb Christian Quest:
> Based on Frederik lowzoom idea, I started improving the low zooms on
> our OSM-FR style...
> 
> Here is zoom 7 (others are in the render_list queue):
> http://tile.openstreetmap.fr/?zoom=7&lat=46.88069&lon=3.13697&layers=0000B0FFF
> 
> Here is how I did it:
> - modify my OSM-FR to remove all labels and boundary at zoom 8 (which
> was already using landcover/landuse),
> - generate 4 large PNG using nik2img
> - combine them and generate one large tiled z8.tif using
> gdal_translate (133MB, if you want to play with it I can share the
> result)
> - create a very simple stylesheet to test using this z8.tif as raster,
> then add placenames and boundaries
> 
> It's a work in progress. I'm currently merging this lowzoom stylesheet
> to my main OSM-FR style sheet.
> 
> I've not played with imagemagick, it is just a lanczos downscaling
> made by mapnik.
> 
> Label ordering is handled by using the place=* tag, then the
> population=* tag so large cities are placed first.
> The placename density is limited using text-min-distance.

Nice

One minor problem: Some city names are not rendered but the city nodes.
Probably it makes sense to allow to move label a bit if they are to close.

Cheers
colliar


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