[Tagging] MAST RELATION

[Tobias Knerr]

On 06.03.25 at 20:46, thigpen--- wrote via Tagging:
> MAST RELATION

As one of the few data consumers who is already evaluating whether 
objects are attached to other objects (for 3D rendering purposes), I'm 
naturally interested in the topic.

Your approach does seem narrow in that it only works for things attached 
to masts. However, the objects you name as examples (cameras, 
billboards, traffic signs, ...) can also be attached to street lamps, 
walls, buildings and many other object types. Ideally, I would like a 
solution that works for those cases as well.

At the moment, I'm relying on the support key:
https://wiki.openstreetmap.org/wiki/Key:support
For example, if something is tagged support=street_lamp, I'm looking for 
the closest street lamp. This approach does not require any relations. 
This means the relationship is only expressed implicitly, but it is 
arguably easier to map.

One benefit of your approach is that it works for situations where the 
mast itself is not mapped as a physical object at all. It also makes 
both the relationship and the vertical order of the attached objects 
explicit.

A possible compromise might be to only use a relation-based approach in 
situations where the implicit relationship might be ambiguous. As I said 
in the beginning, though, my main ask would be for any such solution to 
not be mast-only.