[Tagging] surface=ground/dirt/earth

[Martin Koppenhoefer]

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.



> - "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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/tagging/attachments/20140315/fe5ae018/attachment.html>