[OSM-talk] What's wrong with this multipolygon?
Nathan Edgars II
neroute2 at gmail.com
Fri Aug 27 10:40:41 BST 2010
On Fri, Aug 27, 2010 at 5:35 AM, Willi <willis at gmx.de> wrote:
> On 27. August 2010 09:10 Nathan Edgars II [neroute2 at gmail.com] wrote
>
>> http://www.openstreetmap.org/?relation=1141252
>> Mapnik has no problems with it, but Osmarender won't fill the northern
>> part correctly. (It's not a delay in rendering; I added the swamps
>> after creating the multipolygon.)
>
> There are several areas like school, park, wetland and retail within the
> outer line of the multipolygon but they aren't inner members of the
> multipolygon, i.e. the multipolygon is incomplete. In this case the result
> depends on the rendering sequence and isn't always as expected. You can see
> already in JOSM a difference. These areas aren't drawn in their usual color
> but in a compound color. After adding an area as inner JOSM will draw it in
> its usual color.
Those aren't inner areas though; they're all parts of the Southchase
neighborhood. Think of it like a city boundary multipolygon with
slightly ill-defined borders. (If there's a better way to tag a
mostly-residential neighborhood than landuse=residential name=*, I'm
unaware of it.)
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