[OSM-talk] multipolygon (lake) not rendering

Rahkonen Jukka Jukka.Rahkonen at mmmtike.fi
Mon Oct 26 05:19:47 GMT 2009


I meant "Do all the polygon parts get their correct names in rendering, that is, lake the name given for the outer ring and each islands the name given for the inner ring".  Maybe also "Can export utilities make a correct output of a lake polygon as a polygon with holes and islands as separate polygons for non-OSM programs which cannot handle polygon holes as separate features".  I believe that for example PostGIS used for Mapnik rendering belongs to those non-OSM programs which might have troubles with inner rings having just a name tag.

-Jukka Rahkonen-

John F. Eldredge wrote:
> I think he means, "Wouldn't it be better to tag the entire island with a name, rather than tagging each segment separately?"

> -----Original Message-----
From: Frederik Ramm <frederik at remote.org>
Date: Sun, 25 Oct 2009 23:49:16 
To: Rahkonen Jukka<Jukka.Rahkonen at mmmtike.fi>
Cc: <talk at openstreetmap.org>
Subject: Re: [OSM-talk] multipolygon (lake) not rendering

> Hi,

> Rahkonen Jukka wrote:
> >> For what? The inner ways of multipolygons where the outer way is
>> tagged as natural=water? You don't need to tag them with anything
>> indicating that they're an island, they already are tagged as islands
>> implicitly since they're a multipolygon.
> Islands tend to have names. Does it really work to give a name for each inner
> ring of a lake polygon without any other tags?

> What do you mean by "does it really work"?

> Bye
> Frederik

More information about the talk mailing list