[mkgmap-dev] Question regarding duplicated shapes

Sun Jan 12 22:05:28 GMT 2014

Hi Marko,

thanks for the explanation. So I'll better use other data for testing ;-)

Gerd

> Date: Sun, 12 Jan 2014 23:55:20 +0200
> From: marko.makela at iki.fi
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] Question regarding duplicated shapes
> 
> On Sun, Jan 12, 2014 at 03:46:30PM +0100, Gerd Petermann wrote:
> >while debugging the shape merger I found many duplicated shapes in 
> >Finland, and I am not sure how mkgmap should handle them.
> 
> Oh, the Corine import by "teollisuus" ("industry" in Finnish) is 
> hopeless IMO. :( It is based on very inaccurate data, and the converter 
> is generating duplicate ways and improperly tagged multipolygon 
> relations, like in your example.
> 
> Instead of defining the area-style tags on the multipolygon relation 
> itself, this import added the tags to all relation members (both 
> role=inner and role=outer). JOSM at least used to display this as 
> intended, IIRC.
> 
> Whenever I have fixed some multipolygon error in Finland, I have tried 
> to remove the duplicate shapes, and to move the area-style tags to the 
> multipolygon relation. It is sometimes tricky if someone has already 
> tried to edit the imported data.
> 
> >Example:
> >
> >http://www.openstreetmap.org/way/105723026
> >
> >is tagged landuse=farm and is the role=inner member of
> >multipolygon relation
> >http://www.openstreetmap.org/relation/1504949
> >which has only one role=outer way which also is
> >tagged landuse=farm.
> >Way http://www.openstreetmap.org/way/105719041
> >is a copy of way 105723026, but with reverse order of
> >points. It is tagged natural=scrub
> 
> Yes, this is exactly what I have seen many times.
> 
> FWIW, I do not think that mkgmap should spend too much effort in 
> supporting this broken and redundant way of mapping multipolygons. The 
> Corine data is very low-resolution, basically useless. Now that we 
> finally got the license stuff sorted out at 
> http://www.openstreetmap.org/copyright the import from the National Land 
> Survey database is "only" a matter of writing and configuring a 
> converter, and manually resolving conflicts with existing data. In this 
> process, the Corine landuse imports will probably be deleted.
> 
> Best regards,
> 
> 	Marko
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