[mkgmap-dev] What is the idea behind --adjust-turn-headings?

Mon Aug 10 11:29:33 BST 2015

Yes - in principle this is correct. However for roads with too sharp turns
or even worse intersections that are needed to be less sharp - that's not
true. Maybe concerning long distance routing yes - but when it comes to
does Basecamp/the GPS device choose the better route that is actually
faster - better have some divided roads. I did setup some test maps with
way A vs way B possible between two points. Way A much shorther but with
sharp turns - vs Way B much longer and even having intersections - but not
sharp turns. B will be chosen. Some profiles are completely incapable (e.g.
automotive profiles in new Basecamp versions) of accepting sharp turns -
while some profiles like dirt bike or ATV are actually a bit less dependent
there - but still results will be much better without sharp turns. It's
actually enough to change a sharp turn into a curve - and it will be much
more likely to be routed along...

On 10 August 2015 at 11:57, Andrzej Popowski <popej at poczta.onet.pl> wrote:

> Hi Felix,
>
> > Another possibility would be to decrease the road speed at the
> > turn/intersection by 1 or 2 levels - then have the turn/intersection.
> > At road-speed 0 or 1 it is already much better - and the overall time
> > for the way will decrease! (if you have 10meters in and out of the
> > turn with lower road-speed).
>
> I'm afraid this could greatly increase time for calculating a route. I
> have done tests with some commercial data and cGPSmapper. I'm not sure if
> results are directly compatible with mkgmap, but in my opinion, for routing
> speed most important is the number of roads (class 4 roads in case of long
> distance routes). Single road with multiple nodes (junctions) is better
> than the same nodes arranged as multiple roads.
>
> --
> Best regards,
> Andrzej
>
>
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-- 
Felix Hartman - Openmtbmap.org & VeloMap.org
Floragasse 9/11
1040 Wien
Austria - Österreich
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