R: [mkgmap-dev] max-speed and arbitrary values

Wed Jun 3 12:34:20 BST 2009

Hi,
As far as I know the map only stores the road_speed and road_class (not the speed in km/h: association road_speed vs. speed is demanded to Garmin devices or mapsource).

The turn time penalties I tested was depending on the road_speed (but I presume the penalty is proportional to the speed). Anyway it was not related to the road_class. Do you have other results about those turn time penalties?

for bikers, just put only road_speed=0 or 1 to all roads (maybe road_speed 2 for downward roads...)

Ciao, Marco.

--- Mer 3/6/09, Felix Hartmann <extremecarver at googlemail.com> ha scritto:

> Da: Felix Hartmann <extremecarver at googlemail.com>
> Oggetto: [mkgmap-dev] max-speed and arbitrary values
> A: "Development list for mkgmap" <mkgmap-dev at lists.mkgmap.org.uk>
> Data: Mercoledì 3 giugno 2009, 12:06
> Is it possible to encode arbitrary
> maxspeed values or can we only set in steps of 10km/h?
> 
> For example having road  road_speed=7 associated with
> 35km/h, road road_speed=6 with 27, road_speed=5 with 23,
> road_speed=4 with 20, road_speed=3 with 17, road_speed=2
> with 10 and road_speed=1 with 5km/h. The difference this
> should make would be enough to only set road_class=2, 1 and
> 0 and avoid the big time penalties for sharp turns that
> happen in road_class 4 and 3.
> 
> This would be great for bicycle maps.
> 
> In Mapsource one can change the speed oneself, I noticed
> that dividing default speeds by a factor of 3.5 produces
> pretty good estimation of arrival times for bicylces (when
> using the car/motorcycle setting, as bicycle produces
> rubbish routes) but on the GPS this is not possible.
> 
> @Thilo, do you understand the code good enough to write a
> patch for this if possible.? I have problems understanding
> in which files the maxspeed is handled.
> 
> Cheers,
> Felix
> 
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