On Mar 3, 2008, at 22:45, Sven Grüner wrote:
> Robert Vollmert schrieb:
>> I think not. I'm pretty sure for osmarender, but may not have had
>> enough patience to test out the various combinations with mapnik.
>
I was wrong about osmarender: What I remembered is actually code from
mapnik (or rather, osm2pgsql):
static int pgsql_out_way
[...]
const char *multipolygon = getItem(tags, "multipolygon");
// If the way has been part of a multipolygon then skip
if (multipolygon)
return 0;
The "multipolygon" tag is set in pgsql_out_relation for ways with
role=inner. Furthermore, pgsql_out_relation appears to aggregate tags
of all ways involved, so you should end up with
landuse=forest,natural=water on the multipolygon. I wonder what
happens when both have differing natural= tags?
Or am I reading this all wrong? I haven't really been able to test
because so far, my mapnik install doesn't appear to render any areas...
> Nah, that island is just natural=water and role=inner in a
> multipolygon.
> The green comes from the park encasing the lake. But it only works
> when
> drawn counter-clockwise.
>
> http://www.informationfreeway.org/?lat=52.249&lon=10.52656&zoom=17
And it also works in mapnik! Maybe you're just lucky with the drawing
order? :)
I'll keep experimenting.
Cheers
Robert
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