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[mkgmap-dev] closed ways and multi-polygon relations

From Gerd Petermann gpetermann_muenchen at hotmail.com on Fri Nov 23 07:12:39 GMT 2018


first I'd like to say it works as intended, see 

Unfortunately WanMil is no longer active here, so I have no way to ask him
he deicded to use copies of the original ways instead of the joined way.
for ways with mkgmap:mp_created=true one should not use is_closed(), the
important information is in 
I think the current implementation is not good because it creates lots of
objects instead of a few, maybe only one. Each one is processed in the style
and later the mergel-ine algo tries to put them together again.


popej wrote
> Hi Gerd,
>  > are in fact copies of the original way members of the MP and those are
>  > typically not closed
> I see 3 possible solutions:
> 1. Convert multipolygon ways to a proper, continuous outline.
> 2. Return is_closed() as true, when mkgmap:mp_created is true.
> 3. Add info to documentation, that lines with mkgmap:mp_created=true are 
> part of a closed outline, but not necessary result in is_closed()=true.
> I would suggest solution 3.
> I assume that is_closed() means, that object could be a polygon, while 
> mkgmap:mp_created=true or area=yes describe a more complex object, but 
> essentially a kind of polygon too.

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