[OSM-dev] Multipolygons as members of a multipolygon

[Igor Brejc]

On Mon, Oct 8, 2012 at 10:17 AM, Martin Koppenhoefer <dieterdreist at gmail.com
> wrote:

> 2012/10/8 Igor Brejc <igor.brejc at gmail.com>:
> > it has to be disregarded. Just look at multipolygons Wiki page to see how
> > many exceptions are allowed because people map things differently.
>
>
> one, touching inner rings, or which other exceptions do you intend?
>
> cheers,
> Martin
>

In addition to touching inner rings, some other:

   1. Inner/outer roles - some members have incorrect roles, some don't
   even have a role(
   http://wiki.openstreetmap.org/wiki/Relation:multipolygon#Members). If
   you want to extract as much of the OSM data as possible and in a useful
   form, you have to determine the role geometrically and ignore what's
   written.
   2. http://wiki.openstreetmap.org/wiki/Relation:multipolygon#Tagging
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