[mkgmap-dev] [Patch v3] sharp angles

Sat Sep 5 14:17:17 BST 2015

Yes - I think for the start and end of a route - the algo will choose
topmost route only. For inbetween sections however not - there it chooses
the best - at least according to my tests a few years ago...
There is a max of 6 or 7 roads lying on top of each other - if more it will
produce a routing error and not go there at all.

And yeah - I also don't know what's best. V2 seemed best to me so far.

On 5 September 2015 at 15:09, GerdP <gpetermann_muenchen at hotmail.com> wrote:

> Hi Felix,
>
> okay, I came to similar results with other styles today, so
> maybe I'll revert the change that makes most angles larger.
>
> Reg- --x-cycle-map:
> Without it only angles < 45° are changed to 45°.
> With it and v2, angles were changed to 68° when road speed of an arc is >=
> 3
> and 90° when road_speed >= 5.
> With it and v3, all angles < 90 are changed at junctions with only 3
> directions.
>
> I think the Garmin algo is not really able to handle multiple arcs with
> that your style creates, at least it doesn't seem to "look" at all of them,
> esp. the last part of a route seems always to use the "topmost" road,
> means, the one that was last added in the style (as long as the selected
> vehicle is allowed).
> I think we first have to understand how the Garmin algo works before
> we can try to manipulate the data for better results.
> This is time consuming and error prone, so I'll need a few more days to
> work out facts.
>
> Gerd
>
>
> Felix Hartmann-2 wrote
> > Well - I guess this will never be without errors - with Patch v3 there
> > is again a little loop - now again at the first place:
> >
> >
> > (only happens with "Shorter Distance" and one of the
> > driving/motorcycle/Dirtbike and so on profiles..).
> >
> > Also on some other places still detours - in general "Shorter Distance"
> > seems to be much more problematic than "faster time". So for sharp turns
> > - ironically - shorter distance chooses the detour to avoid the sharp
> > turn.
> >
> >
> > I'm not really sure patch v3 is better than v2 however. Results are
> > 50/50 better/worse. However the arrival times got a bit slower (even if
> > following exactly the same route). I always tried with --x-cycle-map
> > switch - never without. I'm still not so sure what this option really
> > changes for outcome in the end.
> > So - additional intersection roads would still be king IMHO... (but yes
> > I know - not possible).
> >
> >
> >
> > On 04.09.2015 19:34, Gerd Petermann wrote:
> >> Hi all,
> >>
> >> attached is v3, only small changes:
> >> 1) the message "maybe duplicated OSM way " was printed too often
> >> 2) with --x-cycle-map, change the headings
> >> at junctions with only three different arcs so that angles of 90° or
> more
> >> are created.
> >>
> >> If I hear no complains I'll commit this patch on monday,
> >> probably without the --x-fix-sharp-angles switch.
> >>
> >> I am still trying to work out in what case the Garmin routing algo
> >> prefers a detour, so maybe I find more improvements later.
> >>
> >> Ciao,
> >> Gerd
> >>
> >>
> >> _______________________________________________
> >> mkgmap-dev mailing list
> >>
>
> > mkgmap-dev at .org
>
> >> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
> >
> > --
> > keep on biking and discovering new trails
> >
> > Felix
> > openmtbmap.org & www.velomap.org
> >
> >
> > _______________________________________________
> > mkgmap-dev mailing list
>
> > mkgmap-dev at .org
>
> > http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
> >
> > ajjdjdgb.png (24K)
> > <http://gis.19327.n5.nabble.com/attachment/5854037/0/ajjdjdgb.png>
>
>
>
>
>
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-- 
Felix Hartman - Openmtbmap.org & VeloMap.org
Floragasse 9/11
1040 Wien
Austria - Österreich
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