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[mkgmap-dev] Problem with turn restriction

From Gerd Petermann gpetermann_muenchen at hotmail.com on Mon Feb 3 17:48:27 GMT 2014

Hi WanMil,

in the branch the problem occurs if the way is so short that
the two end points are highPrecEqual(). This is very unlikely,
as we talk about <= 4 cm here. 
The problem probably only occurs with ways close to the tile
boundary that are clipped. I don't know if we can save a route 
restriction when the to-node or from-node lies outside of the boundary.


> Date: Mon, 3 Feb 2014 18:35:27 +0100
> From: wmgcnfg at web.de
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] Problem with turn restriction
> > Hi,
> >
> > GerdP wrote
> >> So, I will first check where the way segement gets lost.
> >
> > well, this is quite special, and I am not sure where to fix it.
> >
> > The input file contains no bbox, so mkgmap calculates
> > it (using 24 bit resolution). Later, the way -47698
> > is clipped against this bbox using high precision,
> > and in high prec two points are outside of the calculated
> > bbox.
> >
> > In r3001 I'v fixed that by enlarging the calculated bbox,
> > but I still have to check that this also works
> > when the bbox is calculated by the tile splitter.
> >
> > Gerd
> >
> Hi Gerd,
> uups, I wanted to add bounds information but obviously I missed that and 
> you got and unintended second test case ;-)
> I am thinking how to fix the problem with the very short way and the 
> relation. Do you think it is possible to detect that the short way 
> consists of two points with identical Garmin coords. In this case it 
> might be possible to change the restriction in such a way that the ways 
> connected to the short way are used in the restriction instead.
> I want to make a small statistic why restriction relations become 
> invalid. Maybe the problem is so seldom that it's not worthy...
> WanMil
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