[OSM-dev] osm2pgsql and only-named multipolygons

Frederik Ramm frederik at remote.org
Tue Oct 4 14:22:27 BST 2011


On 10/04/11 12:23, Richard Fairhurst wrote:
> So for the tools I contribute to, principally P2 and an upcoming Ruby PDF
> renderer, I've taken a decision not to spend time on anything more than
> rudimentary multipolygon support (one outer, tags on outer way)

While multipolygons with more than one outer *ring* are uncommon,  those 
with more than one outer *way* are heavily used where I live (typical 
situation: forest bounded by road on one side, or indeed any kind of 
boundary that is part of a mesh).

31% of all multipolygon relations world-wide have more than one "outer" 
member, and 56% of all boundary relations do (but with boundaries it is 
usual to just have an empty role, so in fact there will be more where 
the outer ring comprises several ways).

And I always recommend that people put their tags on the relation, not 
on the way - because I have a hunch that this is closer to a possible 
future area type than asking people to tag the outer way.

Your call entirely of course. And now excuse me, I have to go back to 
implementing all-singing-all-dancing multipolygon relation handlers that 
become obsolete when we get API 0.7 ;)


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