[mkgmap-dev] Estrange detours

Thu Jan 5 20:13:02 GMT 2017

Hi,

my understanding so far is that the Garmin algo doesn't like a rather sharp turn on a road with
highway=trunk [0x02 road_class=4 road_speed=5 resolution 18]

In Germany a trunk road is nearly like a motorway and it seems that the above rule is good for this.
Maybe we should add country specific rules here?

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Carlos Dávila <cdavilam at orangecorreo.es>
Gesendet: Donnerstag, 5. Januar 2017 21:01:57
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] Estrange detours

El 05/01/17 a las 19:05, Andrzej Popowski escribió:
> Hi Carlos,
>
> I have your example tested in BaseCamp and I don't see any problems at
> point 1. At point 2 weird routing appears only for track and camper.
> It could be due to angle at crossroad. I could get normal turn right
> after changing geometry of this crossroad, as in attached picture.
>
> I think there were some changes in mkgmap dealing with angels between
> roads. Maybe this code should be reviewed?
Hi Andrzej
Your findings in BaseCamp match what I found. I guess the problem comes
from the angle between crossing roads, but modifying it as in your
picture would be "tagging for the render" I suspect;-). Current angle
between those two streets is wider than 90º and it shouldn't be avoided
for routing anyway.
Attached is a picture with the correct chart