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

Thu Feb 22 18:27:44 GMT 2018

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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