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

Tue May 4 09:06:43 BST 2021

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
> 
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