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

[Nick Black]

On 1/3/07, Thomas Walraet <thomas at walraet.com> wrote:
>
> Jochen Topf a écrit :
> >
> > 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.


Why do you want to have holes in the river?  You should be able to represent
a river as a Polygon, rather than a Compound Polygon or a series of
polygons, in which case it would render properly in Mapnik.

Nick



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
>
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-- 
Nick Black
--------------------------------
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