[mkgmap-dev] why do we have mkgmap:road-speed-class ?

Sat Dec 28 10:07:11 GMT 2013

Hi WanMil,

okay, now I got it. 
Would it be possible to print a warning when a 
style uses something like
highway=secondary {set mkgmap:road-speed=3}
highway=* & surface=gravel {set mkgmap:road-speed=-1}
highway=* & tunnel=yes {set mkgmap:road-speed=-1}

For a way with highway=secondary,surface=gravel,tunnel=yes the
resulting speed would be 2 (3-1), but the user probably expects 1 (3-1-1).

Gerd

> Date: Sat, 28 Dec 2013 10:52:54 +0100
> From: wmgcnfg at web.de
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] why do we have mkgmap:road-speed-class ?
> 
> lines:
> include 'inc/roadspeed';
> highway=* & lanes > 2 { set mkgmap:road-speed=+1 }
> 
> The roadspeed include sets the road speed. After that you need a 2nd tag 
> to modify the road speed.
> 
> WanMil
> 
> > Hi WanMil,
> >
> > I still don't understand. Please give an example where
> > mkgmap:road-speed-class has to be used because mkgmap:road-speed
> > will not work.
> >
> > Gerd
> >
> >
> >  > Date: Sat, 28 Dec 2013 09:20:20 +0100
> >  > From: wmgcnfg at web.de
> >  > To: mkgmap-dev at lists.mkgmap.org.uk
> >  > Subject: Re: [mkgmap-dev] why do we have mkgmap:road-speed-class ?
> >  >
> >  > > Hi WanMil,
> >  > >
> >  > > I fear I don't understand the meaning of this new tag.
> >  > > Docu says:
> >  > > "A value between 0 and 7. Overrides the road_speed definition in the
> >  > > element type definition if this tag is set."
> >  > >
> >  > > We have mkgmap:road-speed which allows to increment, decrement or
> > override
> >  > > the road speed value in the element type definition.
> >  > > Why did you introduce this new tag?
> >  >
> >  > mkgmap:road-speed already was already used so I could not just change
> >  > its meaning.
> >  > mkgmap:road-speed-class defines the speed classification whereas
> >  > mkgmap:road-speed can define or modify a speed classification. But how
> >  > do you want to modify an already set classification? That's not possible
> >  > in the style because you don't have arithmetic expressions.
> >  > That results in having mkgmap:road-speed-class which defines speed class
> >  > (or better overrides the class defined in the GType) and a modifier
> >  > mkgmap:road-speed. I propose to use mkgmap:road-speed as modifier only
> >  > (prefixed with +-) but I could not remove the usage without prefixed +-
> >  > because that would break existing style sheets.
> >  >
> >  > WanMil
> >  >
> >  > >
> >  > > Gerd
> >  > >
> >  >
> >  > _______________________________________________
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> >  > mkgmap-dev at lists.mkgmap.org.uk
> >  > http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
> >
> >
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> >
> 
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