[mkgmap-dev] mergeroads sometimes breaks routing

Mon Dec 30 09:31:27 GMT 2013

Hi,

just to let you know: I am able to reproduce the results with your data.
Not sure what happens with the mergeroad map. MapSource finds
the shorter route when you select to minimize the distance,
and (depending on the speed settings), it even may calculated
the shorter time for the shorter route. 
For both routes I see a list with 7 hints, so the only explanation
that I have is that MS prefers routes where don't have to 
change roads often within a few meters.

Gerd

> Date: Sun, 29 Dec 2013 10:44:24 -0800
> From: franco.bez at web.de
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: [mkgmap-dev] mergeroads sometimes breaks routing
> 
> I found a very strange routing behaviour connected to the mergeroads-patch.
> The Problem area is here:
> http://www.openstreetmap.org/#map=17/47.89307/10.63390
> 
> When I try to route ( Automobile-mode, minimize-time ) from corner
> Liegnitzer-Straße/Glogauer-Straße to Beuthener-Straße Nr. 11, I get routed
> all the way round the block.
> 
> Using --x-no-mergeroads the routing is fine.
> 
> Even stranger, when I tried to assemble a small testcase with an
> data-extract from JOSM, the routing is fine, even when using mergeroads.
> 
> So the error seems to be triggered by something specific to the tile that
> was generated when building a map of Bayern.
> 
> See screenshots:
> 
> Bad Routing with mergeroads:
> 
> <http://gis.19327.n5.nabble.com/file/n5791132/mergeroads-9452.bmp> 
> 
> 
> Routing OK with --x-no-mergeroads:
> 
> <http://gis.19327.n5.nabble.com/file/n5791132/no-mergeroads-19995.bmp> 
> 
> 
> 
> --
> View this message in context: http://gis.19327.n5.nabble.com/mergeroads-sometimes-breaks-routing-tp5791132.html
> Sent from the Mkgmap Development mailing list archive at Nabble.com.
> _______________________________________________
> mkgmap-dev mailing list
> mkgmap-dev at lists.mkgmap.org.uk
> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.mkgmap.org.uk/pipermail/mkgmap-dev/attachments/20131230/7eae8d47/attachment.html>