[mkgmap-dev] Bug in Road Merging - actually doubling roads.

Tue Feb 27 12:48:47 GMT 2018

Had no time the last 3 days, I'm right now testing some things will post
back in a couple of hours....

On 27 February 2018 at 12:01, Gerd Petermann <
gpetermann_muenchen at hotmail.com> wrote:

> Hi Felix,
>
> any feedback?
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von
> Gerd Petermann <gpetermann_muenchen at hotmail.com>
> Gesendet: Samstag, 24. Februar 2018 10:36:29
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] Bug in Road Merging - actually doubling roads.
>
> Hi Felix,
>
> maybe this helps already:
> Attached is a small patch that changes StyledConverter so that it only
> accepts 4 routable ways for one OSM way.
> Any further routable way for the same OSM way creates just a warning.
>
> Gerd
>
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von
> Felix Hartmann <extremecarver at gmail.com>
> Gesendet: Freitag, 23. Februar 2018 19:08:45
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] Bug in Road Merging - actually doubling roads.
>
> I think merging is fine - maybe just add restrictions to the adjoining
> ways if preset. And it really should not happen that ways are merged past a
> junction - I now think this happens in some more places. Because it's not
> the first time I notice that a routing turns 180° to return to the junction
> to actually turn.
> And maybe could there be a filter that there are never more than 5
> routable ways from continue command? From 6 onwards it crashes devices.
> Maybe even from 5 onwards. 1 routable original and 3 routable overlays are
> definitely fine. (Basecamp/Mapsource don't care - it only crashes GPS
> devices).
>
> On 23 February 2018 at 09:12, Henning Scholland <osm at hscholland.de<mailto:
> osm at hscholland.de>> wrote:
> Hi Gerd,
> Maybe it's better to try to merge these small ways as they anyway only
> creates 'ugly' roads. With increasing level of details in OSM I think
> mkgmap will need some preprocessing to generalise the data first. I'm not
> only thinking about these very small ways, but also have the lane-mapping
> and other mapping details, which are not important for Garmin maps.
> Henning
> On 23 Feb 2018, at 15:21, Gerd Petermann <gpetermann_muenchen at hotmail.com
> <mailto:gpetermann_muenchen at hotmail.com>> wrote:
>
> Hi Felix,
>
> I have to think about this for a while. There are three very short ways
> connected in node 412440328:
> way 130665733 : the northern node 1263658617 is close to a Garmin grid
> point, the sourthern node 412440328 is also closer to this grid point than
> to any other,
> so both are rounded to the same grid point in the north, and finally it is
> ignored.
> way 110722884:  the way is only ~1m long and  both nodes are far from any
> Garmin grid point. This is the way that is causing the trouble.
> It is not removed, instead the initial rounding changes it to a ~3m way
> going north -> south.
> way 130663479: the way has 3 nodes, and the one in the middle (node
> 1263658804) is rounded to the same coords as the ends of the bridge (way
> 103567847) and way 110722884, while the northern node 412440328 is moved up.
>
> I've attached 4 files to document the problem. Please load into JOSM to
> visualize:
> orig.osm.pbf: the original osm data
> init_hp.osm.pbf: the road network as input to WrongAngleFixer in so called
> "high precision"
> init_mu.osm.pbf: like init_hp.osm.pbf, but rounded to Garmin map units
> after-WO_mu.osm.pbf: the result of WrongAngleFixer with coords rounded to
> Garmin map units
> (please ignore the fact that the node ids in non-orig files are wrong)
>
> Somehow I have to teach mkgmap that it would be better to ignore (also)
> way 110722884. I don't know yet what criteria I should use for that.
> Normally we try to keep all routable ways, as they may contain access
> restrictions.
>
> BTW: There is more such trouble near way 111528851.
>
> ciao,
> Gerd
>
> ________________________________
>
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk<mailto:mkgmap-
> dev-bounces at lists.mkgmap.org.uk>> im Auftrag von Felix Hartmann <
> extremecarver at gmail.com<mailto:extremecarver at gmail.com>>
> Gesendet: Donnerstag, 22. Februar 2018 20:19:15
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] Bug in Road Merging - actually doubling roads.
>
> Perfect. I guess my maps are the only one causing bsod here on devices,
> but without the bug they would be fine...
>
> On 22 Feb 2018 20:03, "Gerd Petermann" <gpetermann_muenchen at hotmail.com
> <mailto:gpetermann_muenchen at hotmail.com><mailto:g
> petermann_muenchen at hotmail.com<mailto:gpetermann_muenchen at hotmail.com>>>
> wrote:
> Hi Felix,
>
> I can reproduce the problem with a small download around the way and just
> the --route option.
> The problem seems to be in WrongAngleFixer, it says
> "... all points of way http://www.openstreetmap.org/way/130665733 are
> rounded to equal map units"
> No idea why the way is not reduced to a single point, will investigate
> further.
>
> Gerd
>
> ________________________________
>
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk<mailto:mkgmap-
> dev-bounces at lists.mkgmap.org.uk><mailto:mkgmap-dev-bounces@
> lists.mkgmap.org.uk<mailto:mkgmap-dev-bounces at lists.mkgmap.org.uk>>> im
> Auftrag von Felix Hartmann <extremecarver at gmail.com<mailto:
> extremecarver at gmail.com><mailto:extremecarver at gmail.com<mailto:
> extremecarver at gmail.com>>>
> Gesendet: Donnerstag, 22. Februar 2018 19:27:44
> An: Development list for mkgmap
> Betreff: [mkgmap-dev] Bug in Road Merging - actually doubling roads.
>
> I just noticed that mkgmap sometimes creates a lot more routable roads for
> a certain stretch than actually defined in the style-file.
>
> https://www.openstreetmap.org/way/130665733
>
> should be only once as a routable line in my map, however it ends up 6
> times!
> Once is correct, but 5 iterations are actually the way from the south (3
> times) and the way from the East (2 times). Now each of these ways should
> be created that often, however it should not overlay into this short
> stretch of way.
>
> While doubling up ways can be beneficial for routing, having a way more
> than 5 times on top of each other let's Garmin devices crash on routing
> over them. Also it leads to detours - as it will not always route straight
> from the Way from South to the Way going to the West, but follow along
> after the intersection for 4.3m until hitting up north, then reversing and
> finally going to the way in the West.
>
> I've uploaded the tile here:
> https://openmtbmap.org/gmapsupp_copied.img
>
>
> I'm pretty sure that with other style-files - the way will also be copied
> past the intersection and end up too often in the map for that 4.3m
> stretch...
>
>
> I kinda guess it is related to it being so short - that place has some
> remarkable micro-mapping detail.
> Or is this really expected?
>
>
> If needed I can try to create a reduced style to only create that problem
> - but I think the bug should be obvious.
>
>
> --
> Felix Hartman - Openmtbmap.org<http://Openmtbmap.org> & VeloMap.org<
> http://VeloMap.org>
> Schusterbergweg 32/8
> 6020 Innsbruck
> Austria - Österreich
> ________________________________
>
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> mkgmap.org.uk>>
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>
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>
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>
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>
>
>
> --
> Felix Hartman - Openmtbmap.org & VeloMap.org
> Schusterbergweg 32/8
> 6020 Innsbruck
> Austria - Österreich
> _______________________________________________
> mkgmap-dev mailing list
> mkgmap-dev at lists.mkgmap.org.uk
> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>

-- 
Felix Hartman - Openmtbmap.org & VeloMap.org
Schusterbergweg 32/8
6020 Innsbruck
Austria - Österreich
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