[Tagging] surface=ground/dirt/earth

David Bannon dbannon at internode.on.net
Mon Mar 17 06:37:11 UTC 2014


On Sun, 2014-03-16 at 22:11 -0300, Fernando Trebien wrote:


> Do you all agree with these wiki edits?
> 
1. Yes, almost. Not too happy with the term 'stiffness'. Maybe just remove the term 'stiffness' ?

2. Yes.

3. Yes.

4. Yes, I guess so ...

However, while a good job Fernando, I still think we are missing the
real issue here. What people and routing engines want to know is how
usable a road is. For most people and most situations, people want to
know if they will be OK using it in their [4x4, SUV, Conventional car,
silly car] given their [extensive..zero] rough road experience. However,
this approach is seen as 'subjective', a serious crime ...

Sigh...

David 

> http://wiki.openstreetmap.org/w/index.php?title=Key%3Atracktype&diff=1002090&oldid=992679
> 
> http://wiki.openstreetmap.org/w/index.php?title=Template%3AMap_Features%3Atracktype&diff=1002096&oldid=971383
> 
> http://wiki.openstreetmap.org/w/index.php?title=Key%3Asmoothness&diff=1002098&oldid=905282
> 
> http://wiki.openstreetmap.org/w/index.php?title=Key%3Asurface&diff=1002099&oldid=970317
> 
> On Sun, Mar 16, 2014 at 6:07 PM, Fernando Trebien
> <fernando.trebien at gmail.com> wrote:
> > On Sat, Mar 15, 2014 at 6:41 PM, Martin Koppenhoefer
> > <dieterdreist at gmail.com> wrote:
> >>
> >> 2014-03-15 16:29 GMT+01:00 Fernando Trebien <fernando.trebien at gmail.com>:
> >>
> >>> "tracktype" is the "degree of compaction" of the material
> >>> (regardless of material)
> >>
> >>
> >>
> >> I have always more thought of it "how much it was constructed", while
> >> tracktype=1 is a paved road, 5 will be a track on grass (almost or not
> >> constructed at all) and the rest in between. Generally a tracktype=grade1
> >> should be easily navigable by bike or foot also after days of rain while for
> >> grade2 you would hope so and grade3 is not clear, 4 and 5 probably not. In
> >> the end it is a generalized hierarchical system that comprises several
> >> single characteristics to come to a summarizing tag value (and the single
> >> characteristics are not documented and may vary on individual basis).
> >> Somehow it still works as you can compare the values with other tracks in
> >> the same area.
> >
> > Hm I think that someone on a city bike (not on a mountain bike) would
> > find tracktype=grade2 somewhat inconvenient, but still usable indeed.
> >
> > Anyway, I'm making these questions because thinking of "degree of
> > compaction" (same as "hardness" maybe) makes tracktype essentially
> > independent from both smoothness and surface tags. You can then guess
> > more accurately things such as expected speed, comfort level, draft
> > forces, and the risk of getting bogged.
> >
> > One question: do you think that an almost flat natural rock path
> > should be tracktype=grade1 (because it's closer to "compacted") or
> > tracktype=grade5 (because it's not "constructed")?
> >
> >>
> >>
> >>>
> >>> - "smoothness" is the "degree of irregularity" of the surface (for
> >>> wheeled vehicles, also regardless of material)
> >>
> >>
> >>
> >> yes. in other words how "smooth" or "even" the surface is.
> >>
> >>
> >>>
> >>> - "surface" more closely represents the material structure, usually
> >>> regardless of other characteristics (with a few exceptions)
> >>
> >>
> >>
> >> yes, surface is a mixture of the ~material (roughly classified) and in some
> >> cases the way of application / the overall structure (e.g. cobblestones).
> >>
> >> cheers,
> >> Martin
> >>
> >> _______________________________________________
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> >> Tagging at openstreetmap.org
> >> https://lists.openstreetmap.org/listinfo/tagging
> >>
> >
> >
> >
> > --
> > Fernando Trebien
> > +55 (51) 9962-5409
> >
> > "The speed of computer chips doubles every 18 months." (Moore's law)
> > "The speed of software halves every 18 months." (Gates' law)
> 
> 
> 





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