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

Fri Feb 23 08:12:06 GMT 2018

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, 15:21, at 15:21, Gerd Petermann <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> im Auftrag von
>Felix Hartmann <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>>
>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>>
>im Auftrag von Felix Hartmann
><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 & VeloMap.org
>Schusterbergweg 32/8
>6020 Innsbruck
>Austria - Österreich
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>
>
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