[Tagging] wall and block that aren't a barrier

Lionel Giard lionel.giard at gmail.com
Tue Jun 12 11:14:50 UTC 2018

The main idea that i got for barrier=retaining_wall is to indicate that
between the lower ground and the upper ground, there is a retaining wall
preventing the movement to got this way (most probably, car or bicycle
can't go through the retaining wall easily, as it act like a small
"cliff"). That's why it is a barrier.

In this example, only the wall would be indicated by this tag as it prevent
people to go directly in that direction easily (you would need to escalade
the wall), so it is better to take the path around with the stairs.

2018-06-11 18:25 GMT+02:00 Tobias Knerr <osm at tobias-knerr.de>:

> On 09.06.2018 23:13, marc marc wrote:
> > https://upload.wikimedia.org/wikipedia/commons/thumb/2/22/
> Rehbrunnen_04.jpg/800px-Rehbrunnen_04.jpg
> Based on this picture, the current mapping is clearly incorrect. This
> basin doesn't qualify as a barrier=retaining_wall even if we allow for a
> very generous reading of the tag's definition.
> For most use cases, I believe it would be entirely sufficient to draw an
> area for the fountain, and add subtags as desired. For map users who are
> interested in how the fountain looks, the image and wikimedia_commons
> tags are already available.
> The mapper seems to be interested in going beyond that and creating a
> relatively detailed model of the fountain, which is a legitimate goal
> and might be useful in some applications, e.g. 3D rendering. However,
> I'd argue that our editors and data model aren't really the right tools
> for that job. It would seem more practical to create a model of the
> fountain in Blender or SketchUp, which could then be uploaded to the 3D
> Model Repository and linked with OSM.
> If we to try to model the fountain using OSM ways and areas anyway,
> though, then I'd rather see specialized tags for fountain micromapping
> (nano-mapping?) introduced. Re-purposing existing tags for this use case
> isn't a good idea imo.
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