[OSM-dev] multipolygons - dealing with topology errors

[Ben Supnik]

Hi Y'all,

Two things about multipolygons:

1. My software now detects topologically broken multipolygons, e.g. 
cases where I can't form rings out of the node list.  Is this useful, or 
is this information already generated by things like pgsql?

2. While looking at one test set of data, I found a lake where one 
island (modeled as a hole in the lake multipolygon) had not been "sealed".

Mapnik simply ignored the island, but osmarender had linked the start 
and end of the ways to form the island.

I have learned from experience that it isn't useful for me to ask 
"what's the spec"...OSM is its own spec, etc. etc.

So I'll just ask: any comments?  Is one interpretation considered better 
or worse than the other?

cheers
ben
-- 
Scenery Home Page: http://scenery.x-plane.com/
Scenery blog: http://xplanescenery.blogspot.com/
Plugin SDK: http://www.xsquawkbox.net/xpsdk/
X-Plane Wiki: http://wiki.x-plane.com/
Scenery mailing list: x-plane-scenery at yahoogroups.com
Developer mailing list: x-plane-dev at yahoogroups.com