Mark Burton wrote: 
Hi Felix,

  
I am not sure which of todays changes is responsible, but routing in 
Mapsource became a lot worse! Often I get routes 10-30% longer or on 
less priorised ways than before, this is a drastic example but happens 
on every 10 route:

Yellow route is old SVN 1773, pink is newest SVN version (yellow is 
17.8km and 33 minutes, pink is 26.5km and 56 minutes):

    

Please try increasing the values of MAX_ARC_LENGTH and MAX_LINE_LENGTH
and see if that improves things. I would not expect MAX_LINE_LENGTH to
make a difference as that only influences lines not routable ways.

If the reduction in MAX_ARC_LENGTH is causing your routing to become
worse, that's going to conflict with the issue Marko reported.

Could it be that at resolution 24 we have filters running for smoothing lines that cause the problem, or the tweeze arc causing problems with low values?

The crazy thing is that if I increase max_arc_length at resolution=24 I will even see roads with different shapes/angles at the junction.

The thing is that with more max_arc_length and max_line_length (both set to 80.000) even on very short roads routing get better - roads that definitely don't have more than 20 points or longer than 200-300m.
This however happens only once the overall length of the route without via points gets longer (starting at about 30-40km).

Another thing we could try is to make the tweeze arc filter much more radical - maybe this would help in the routing problem. I still cannot believe that the max_arc_length itself is responsible for the problems on the Nuvi.
Cheers,

Mark
_______________________________________________
mkgmap-dev mailing list
mkgmap-dev@lists.mkgmap.org.uk
http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev