[mkgmap-dev] found multiple points with equal coord.....

Tue May 4 09:54:07 BST 2021

Hi Gerd

I think it should just deal with the (probably) common, significant
case and assume the restriction is needed.

The short distance is, nominally, from the centre-line to the side of
the non-barriered highway. In the examples I've seen this more than
highPrecEqual but less than 2m (apart from the errors where mappers
have put a stile on the junction, forcing car-routing to avoid the
area!)

Ticker

On Tue, 2021-05-04 at 08:16 +0000, Gerd Petermann wrote:
> Hi Ticker,
> 
> thanks for the info. I didn't see such messages in GpsMapEdit before,
> only for turn-restrictions with multiple via nodes.
> The only special case here is that the barrier node "highPrecEquals"
> the last node.
> 
> A general question would be if mkgmap should detect that a
> restriction shoud better be ignored when it only restricts access to
> the last 5 meters or so.
> I didn't try it but I guess it could lead to routing problems if your
> start is at the end of the road.
> 
> 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, 4. Mai 2021 10:06
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] found multiple points with equal coord.....
> 
> Hi Gerd & others
> 
> This is a quite common physical set-up; a highway with another, more
> minor, highway/track/path leading off it with a "barrier" at the
> junction, inhibiting access to the minor highway.
> 
> Often the only clear access restrictions visible on-the-ground are on
> the barrier, so these are what get represented in OSM. A minimal
> distance between the barrier and the major highway is needed to map
> this on OSM.
> 
> mkgmap should handle this situation correctly. I haven't tried to
> understand why it didn't before, but if the patch fixes it then it
> should be applied.
> 
> I've seen other examples of GPSMapEdit flagging errors like this:
> 
> WARNING: Unexpected format of input data. Unexpected NodeID=936272 in
> turn restriction at (51.013083,-1.389384). The restriction will be
> ignored
> 
> where there are very short section between the restriction and the
> junction node and I think it is just a GPSMapEdit problem.
> 
> Ticker
> 
> 
> On Sun, 2021-05-02 at 08:46 +0000, Gerd Petermann wrote:
> > Hi all,
> > 
> > the message
> > "Found multiple points with equal coords as CoordPOI at
> > http://www.openstreetmap.org/?mlat=56.835675&mlon=37.404949&zoom=17
> > "
> > is produced because the nodes
> > https://www.osm.org/node/2924385337
> > https://www.osm.org/node/2924351922
> > are so close together that mkgmap could not distinguish the
> > position.
> > No idea why someone maps a lift-gate less that close to the end of
> > the road, but of course mkgmap should not fail with this.
> > 
> > The problem doesn't show up with the default style unless I add
> > this
> > line in points rules:
> > barrier=*{ addaccess no;}
> > after
> > barrier=* & access=* {addaccess '${access|subst:private=>no}'}
> > Without this change the default style doesn't create a route
> > restriction for the barrier node
> > https://www.openstreetmap.org/node/2924385337
> > 
> > I've created a patch to fix this problem for good by adding  a
> > hashmap but GpsMapEdit doesn't like the result:
> > Unexpected format of input data. Unexpected NodeID=136381 in turn
> > restriction at (56.835666 37.404950). The restriction will be
> > ignored.
> > 
> > The old code didn't add the restriction, the new code does.
> > Now I am unsure if the "corrected" code causes more trouble than
> > the
> > old. Maybe I should somehow detect the special case that a barrier
> > is very close to an end of a way which is not connected to other
> > ways? If I change the input data so that the end is a bit more away
> > GpsMapEdit doesn't complain. Is it just a problem in GpsMapEdit?
> > 
> > Gerd
> > 
> > ________________________________________
> > Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag
> > von Thomas Morgenstern <webmaster at img2ms.de>
> > Gesendet: Samstag, 1. Mai 2021 08:56
> > An: Development list for mkgmap
> > Betreff: [mkgmap-dev] found multiple points with equal coord.....
> > 
> > Hi ,
> > yesterday mkgmap r4587 gives me following message : 'found multiple
> > points with equal coord as CoordPOI at 56.835467 37.404949.......
> > The map seems okay. What shell I do with this message ?. Is this
> > meassage only a hint for incorrect data ? Or what else ?
> > 
> > thomas
> > 
> > _______________________________________________
> > mkgmap-dev mailing list
> > mkgmap-dev at lists.mkgmap.org.uk
> > https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
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