[mkgmap-dev] Problem with turn restriction

Mon Feb 3 18:43:27 GMT 2014

Hi Gerd,

 > 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.

Sounds great!

> 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.

Would it solve the problem if the boundary nodes are added earlier just 
before the RestrictionRelation.addRestriction(MapCollector) is called?

WanMil

>
> Gerd
>
>  > 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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