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[mkgmap-dev] type=multipolygon relations

From Marko Mäkelä marko.makela at iki.fi on Sat Jan 18 17:52:51 GMT 2014

On Sat, Jan 18, 2014 at 04:30:34PM +0100, Gerd Petermann wrote:
>I wonder why we don't remove duplicate entries when we process the 
>members of mp relations. Is there any possible constellation where this 
>would cause trouble?

I cannot think of any. It should also not make any sense for the same 
way to be in different roles in a multipolygon relation.

(In a route relation, you could have the same way twice, in role=forward 
and role=backward. You might even have a way multiple times, if the 
route is visiting points A, B, A, C, A.)

The JOSM relation editor is highlighting duplicate relation members. I 
think that it would be good to issue a log message for the duplicate 
multipolygon members, so that the data can be corrected (simplified).


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