[mkgmap-dev] special case where splitting fails without a log message

Wed Jun 2 10:23:40 BST 2021

Hi Gerd

I see what you mean. Is this with splitShaeFix_5_lowRes.patch?
I'll investigate. Is there an OSM file I can run with?

Ticker

On Wed, 2021-06-02 at 06:32 +0000, Gerd Petermann wrote:
> Hi Ticker,
> 
> please check https://files.mkgmap.org.uk/download/509/special-v5.zip
> 
> Can you tell me why ShapeSplitter drops some points, e.g the one near
> 68.2669706, 15.1206053 without complaining?
> None of the points in the original data is visited more than twice
> and all highprec equal points are unique.
> 
> I'm working on an improvement to make the connecting lines shorter,
> but I don't see yet how I can avoid to have connecting lines like
> that.
> 
> Gerd
> 
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag
> von Ticker Berkin <rwb-mkgmap at jagit.co.uk>
> Gesendet: Dienstag, 1. Juni 2021 17:18
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] special case where splitting fails without
> a log message
> 
> Hi Gerd
> 
> I've added code to deal with some variants of the case as described -
> I
> hope this will be enough to cope with more complex shapes generated
> by
> ShapeMerger.
> 
> There might be a bit more I can do without having to resort to more
> complex geometry analysis if it still gives problems.
> 
> I've also restructured it a bit.
> 
> Patch attached based on low-res-opt. Trunk version will be the same
> (but the patch would be different)
> 
> Ticker
> 
> On Mon, 2021-05-31 at 17:12 +0100, Ticker Berkin wrote:
> > Hi Gerd
> > 
> > shapeSplitter will have problems (ie get it wrong some of the time)
> > where there are in/out lines to a hole that share the same cut
> > point
> > as
> > a line that is the boundary between a shape and hole; could be many
> > holes (or shapes) and many lines. The simple sort/dedupe I was
> > doing
> > isn't adequate. I'll come up with something better tomorrow.
> > 
> > Ticker
> > 
> > _______________________________________________
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> > mkgmap-dev at lists.mkgmap.org.uk
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