[mkgmap-dev] [PATCH v4] - beware of the bollards!

Mon Jul 20 22:03:37 BST 2009

2009/7/20 Mark Burton <markb at ordern.com>

>
> Hi Felix,
>
> > Well but one allways has to remap these values to motorcar=yes for
> special
> > purpose maps, as only car/motorcycle provides proper routing.
>
> Never understood that need to route as a car, but I am happy to cater
> for such a foible.
>

bicycle does rely only on routeclass, not on speedclass. So you can only
have 0-4 as differentiation in bicycle mode, no different speed (o.k. you
have 0 and 1 (2-7 get degraded to 1), basically bicycle mode equals motorcar
shorter distance, so you miss the faster / shorter time routing option
(though choosable) when going for bicycle modus. With only 5 different
classes of roads it is more or less impossible to prefer i.e. a mtbroute
over a cycleroute over a ......., you get too many roads/ways classified
equally and too few possibilites to heavily downgrade something.

One could of course use taxi, emergency, .... also as they route as good as
car/motorcycle - but bicycle and pedestrian do not produce any reasonable
routes (basically only good for shortest route while avoiding some road
types, but not enough to prefer specific road types). The problem is that
while every garmin unit (except edge) supports car/motorcycle not all
support emergency or taxi. I don't think maps where you expect cyclists to
choose emergency mode because car/motorcycle is really kept for cars but
they can only choose car/motorcycle will work well for them. That's why I
prefer to use car/motorcycle, it is the best to provide consistent results.

>
> > I have not
> > really read through the patch as it does not interest me, but you have to
> > make sure that it runs before the style-file for the access values,
> > otherwise routing with a bicycle on car/motorcycle mode will not work
> > anymore.
>
> Well, it runs after the style file stuff so to avoid making you
> unhappy, I shall make it disabled by default and the switch will enable
> it.

if it is enabled by default, but you can disable it, it would be fine with
me too. I just think we should have a possibility for speciality maps not to
need to calculate things that are not needed.

>
>
> > I'm a bit skeptical if this will really not pose any problems for
> speciality
> > maps. With a switch it would be cleaner (and not cost any additional
> > calculation time for other maps).
>
> Your scepticism is well placed.
>
> Cheers,
>
> Mark
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