[Tagging] better mapping for embankments / slopes

Volker Schmidt voschix at gmail.com
Tue Nov 29 14:25:19 UTC 2016

If you want to micromap slopes you should create a new key "slope" or
something similar. An embankment has two slopes. It is equivalent to dyke
or levee. The one-side embankments that are defined in the OSM wiki, are in
reality slopes and should be retagged accordingly.

Independently of the name used fo the tag I see the prblem of defining
where the slope starts, normally these are rounded features.

On 29 November 2016 at 13:48, Martin Koppenhoefer <dieterdreist at gmail.com>

> Currently we are mapping only one side of the embankment (I think it's the
> upper side, but am not sure if the wiki says this explicitly), with the
> direction. What we would IMHO need is a way to map the lower side as well
> and to combine both. A closed polygon will not work I believe.
> The obvious solution that comes to mind is a new relation type: in case
> the upper end is mapped, draw a new way for the lower end and combine both
> with a relation (possibly assigning roles like upper and lower, maybe also
> draw lateral ways (ways that connect the ends of the upper and lower ways
> and defines their shape) in cases they are not straight). (The type=area
> relation does this)
> Maybe it could also be done without the relation, simply by tagging the
> upper and lower ways accordingly, and connect them at least at one of their
> ends with an explicit lateral way (and respective tags). This would require
> from the data user to topologically search for the embankment area in order
> to be able to render it (or make other use).
> What do you think, which representation is better? Are there alternatives?
> Cheers,
> Martin
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