[OSM-dev] multipolygons - dealing with topology errors
bsupnik at xsquawkbox.net
Tue Jul 21 03:36:21 BST 2009
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?
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