[OSM-talk] tiles rendering

[Artem Pavlenko]

Hi David,

>
> However in theory it looks a good approach.  I'm not clear however where
> these new polygons would be stored?  Is it separate to the OSM  database?
>

Good question. I think having 'polyginized' coastline in OSM DB would be a 
good idea.  BTW all existing/improved coastline already in OSM can be used to 
create polygons. 

Cheers
Artem  

> David
>
> > On Wednesday 31 January 2007 23:11, Jon Burgess wrote:
> >> On Wed, 2007-01-31 at 22:36 +0000, Jon Burgess wrote:
> >> > On Wed, 2007-01-31 at 21:43 +0000, Artem Pavlenko wrote:
> >> > > Yes, good idea.  We should only output 'closed' polygons
> >> > >
> >> > > if (polygon && start_point == end_point)
> >> > > {
> >> > > ...
> >> > > }
> >> > > else
> >> > > {
> >> > > ..
> >> > > }
> >> > >
> >> > > Artem
> >> >
> >> > That didn't seem to make any difference.
> >> >
> >> > It seems the issue is in osm.xml. The PolygonSymbolizer will render
> >> > any data as a polygon, even if the source data is a linestring :-).
> >> > This attached patch makes things look much better in my eyes. The
> >> > style may need more tweaking.
> >> >
> >> > The data I have loaded in postgis currently is from the "open areas
> >> > are not polygons" version of osm2pgsql currently so I can't be 100%
> >> > certain that this style change alone fixed it, but i'm quite confident
> >> > the osm.xml change is sufficient.
> >> >
> >> > Please try it out on your system and see if it fixes the grey
> >> > triangulated coastline.
> >> >
> >> > Jon
> >>
> >> I found some issues with the last patch, I think this one renders more
> >> cleanly at all zoom levels. It treats all natural= the same as
> >> waterways, i.e draws as a blue line for the coastline.
> >>
> >> The only downside I see with this is that natural=water no longer gets
> >> filled, you'll just get a blue outline. This may effect ponds, lakes
> >> etc.
> >>
> >> Perhaps natural=water should be rendered as a polygon but I don't
> >> understand the mapnik rule/scale/filter/else model well enough to make
> >> the rendering work reliably at all zooms.
> >>
> >> Jon
> >
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