[mkgmap-dev] Curvy routing support: new function?

Thu Jul 31 06:18:49 BST 2014

Hi WanMil,

unfortunately the curviness() function does not work as expected yet. I can try to help to analyse it, may I have a look at the source code anywhere? The function alone would be enough

Thanks and cheers
Manfred

PS: please find detailed analysis in my mail from July 3

> Gesendet: Donnerstag, 03. Juli 2014 um 20:49 Uhr
> Von: WanMil <wmgcnfg at web.de>
> An: "Development list for mkgmap" <mkgmap-dev at lists.mkgmap.org.uk>
> Betreff: Re: [mkgmap-dev] Curvy routing support: new function?
>
> I forgot to clean before build...
> Here is the new version: http://files.mkgmap.org.uk/detail/216
> 
> > Hi WanMil,
> >
> > you are very fast, thank you very much for this!
> > However I'm facing some expectations, log:
> > java.lang.NoSuchMethodError: uk.me.parabola.mkgmap.reader.osm.Way.deleteTag(Ljav
> > a/lang/String;)V
> >          at uk.me.parabola.mkgmap.reader.osm.MultiPolygonFinishHook.end(MultiPoly
> > gonFinishHook.java:50)
> >          at uk.me.parabola.mkgmap.reader.osm.OsmReadingHooksChain.end(OsmReadingH
> > ooksChain.java:79)
> >          at uk.me.parabola.mkgmap.reader.osm.o5m.O5mBinMapDataSource.load(O5mBinM
> > apDataSource.java:49)
> >          at uk.me.parabola.mkgmap.reader.osm.OsmMapDataSource.load(OsmMapDataSour
> > ce.java:127)
> >          at uk.me.parabola.mkgmap.main.MapMaker.loadFromFile(MapMaker.java:167)
> >          at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:63)
> >          at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:253)
> >          at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:249)
> >          at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
> >          at java.util.concurrent.FutureTask.run(Unknown Source)
> >          at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
> >          at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
> >          at java.lang.Thread.run(Unknown Source)
> >
> > (I have installed r3310 which works ok, and then replaced mkgmap.jar by your build)
> >
> > I'm open to any suggestions for other logic. A curviness function can only be a virtual value, not physical. However it may probably sufficient to say, curviness=length()/distance(first_point, last_point)? May be I'm thinking too complex :-)
> >
> > Cheers
> > Manfred
> >
> >
> >
> >> Gesendet: Dienstag, 01. Juli 2014 um 22:32 Uhr
> >> Von: WanMil <wmgcnfg at web.de>
> >> An: "Development list for mkgmap" <mkgmap-dev at lists.mkgmap.org.uk>
> >> Betreff: Re: [mkgmap-dev] Curvy routing support: new function?
> >>
> >> Hi,
> >>
> >> I remember that it is on my Todo-List :-)
> >>
> >> So I performed a quick implementation following your suggestion. You can
> >> find in the attached patch so that you can play a little bit with it.
> >> (Attention: it is completely untested!!)
> >> You can find a patched mkgmap.jar at http://files.mkgmap.org.uk/detail/215.
> >>
> >> I think curviness should to be defined in a different way.
> >> 1. Calculate the distance of each point Dmiddle to the virtual line from
> >> first to the last point.
> >> 2. curviness()=standard mean(Dmiddle/(length to next point + length to
> >> previous point)
> >>
> >> I think this gives a better indication how curviness a road is. But it
> >> need to be implemented and tested later on :-)
> >>
> >> WanMil
> >>
> >>> Hi all,
> >>>
> >>> Garmin offers "curvy roads" preferences for their zümo 390 and 590 devices.
> >>> https://buy.garmin.com/en-US/US/on-the-road/motorcycles/zumo-390lm/prod138275.html
> >>> I'm thinking about creating motorcycle maps for old 200 series.
> >>> Might it be useful to integrate a curviness() function so that mkgmap can optimize for curvy roads too? It might also help do determine a better default speed for curvy roads for use with car routing.
> >>>
> >>> The curviness() value might be the overall absolute turning angle (in degrees) of a road segment divided by the segment's length.
> >>>
> >>> What's your opinion?
> >>>
> >>> Cheers
> >>> Manfred
> >>>
> >>>
> >>>
> >>>
> >>> Pseudo code might look like this:
> >>>
> >>> function curviness()
> >>> {
> >>> oldpoint=points(0)
> >>> foreach (point of a way segment as newpoint)
> >>>     {
> >>>     d_x=(newpoint.x-oldpoint.x)/360*40000000*COS(newpoint.x*PI()/180) //in meters
> >>>     d_y=(newpoint.y-oldpoint.y)/360*40000000 //in meters
> >>>     length+=sqrt(d_x**2+d_y**2)
> >>>     angle=arctan(d_y/d_x)
> >>>     d_angle=abs(angle-old_angle)
> >>>     sgn_x=sgn(d_x)
> >>>     sgn_y=sgn(d_y)
> >>>     if ((sgn_x*sgn_y*old_sgn_x*old_sgn_y)=-1 && (sgn_x!=old_sgn_x))  d_angle=pi-d_angle  // 180 degrees correction, otherwise north-south roads show strange results
> >>>     if (point>1) sum_angle+=d_angle
> >>>     old_angle=angle
> >>>     oldpoint=newpoint
> >>>     old_sgn_x=sgn_x
> >>>     old_sgn_y=sgn_y
> >>>     }
> >>> return sum_angle/length
> >>> }
> >>>
> >>> // perhaps simple multiplication is faster than 4 times sgn() functions?
> >>> _______________________________________________
> >>> mkgmap-dev mailing list
> >>> mkgmap-dev at lists.mkgmap.org.uk
> >>> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
> >>>
> >>
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> >
> 
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