I gave up tagging a way's smoothness a long time ago as it's so
subjective & open to misinterpretation. Agreeing on what the make-up of
the actual surface is difficult enough. See also anything referred to as
'difficult' or 'dangerous':
All of the scales listed here would be described by me as "You've got to
be kidding me, I'm getting off & pushing.":
https://wiki.openstreetmap.org/wiki/Key:mtb:scale
DaveF
On 28/01/2018 07:59, Johannes wrote:
Hello,
I wanted to get some opinions about an idea of mine.
I consider data on the smoothness/roughness of routes to be quite important for
cycle routing in order to plan optimal routes. Up to now, this has not played a
major role in bicycle routes, as far as I know. Therefore, I would like to make
a small improvement of the surface data for paths in Openstreetmap.
You can see on mapillary photos what kind of road surface there is on a cycle
path, but you can't deduce reliable data about the smoothness of it.
A first technical idea was to record a track as a GPX file enriched with a
vibration coefficient (IRI, International Roughness Index, dont know the
exactly format yet) recorded by a smartphone while riding a bike.
The GPX file format seems to be flexible enough (extension?) to store
additional data such as this coefficient.
Therefore a central data repository is needed.
Do you think it's a good idea to store such enriched GPX data in the public GPS
tracks repository on openstreetmap.org and make appropriate changes to the
database schema and API so that these additional metadata are preserved when
exporting GPX, so that on the one hand the GPS tracks can be made available to
the public and on the other hand special client software can visualize the
vibration metadata.
What do you think?
Greetings Johannes
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