[OSM-talk] Mapnik, large river, area with hole [was: Re: The segments vs ways vs superways question again...]

[Christopher Schmidt]

On Wed, Jan 03, 2007 at 04:58:33PM +0100, Thomas Walraet wrote:
> Jochen Topf a ?crit :
> > 
> > Currently we can't do:
> > 
> > - Areas with holes in them. Current hack around this: Define inner area
> >   with higher layer. Disjoint areas: Say several parking lots around a
> >   convention center that we want to tag together.
> > [..]
> > - Large rivers  [..]
> 
> I draw the Seine (large river) inside Paris with many areas to have 
> holes in it.
> 
> It render nicely with osmarender :
> http://dev.openstreetmap.org/~ojw/Browse/?x=16598&y=11273&z=15&tileset=0
> 
> But it doesn't work with mapnik :
> http://labs.metacarta.com/osm/?lat=6217835.98446&lon=261701.92235&zoom=13&layers=B00
> 
> 
> This is because mapnik draw a border around water.
> I think it's a bad idea. If we zoom more, another problem come from this 
> "water border" : it can be confused with a road
> Ex : 
> http://labs.metacarta.com/osm/?lat=6217588.7585&lon=262380.30083&zoom=15&layers=B00

This is a known issue that I have not yet resolved. 

Regards,
-- 
Christopher Schmidt
MetaCarta