[Tagging] hydrants

Viking viking81 at tin.it
Tue Oct 9 20:33:48 UTC 2018

Bkill, you added fire_hydrant:opening to wiki page [0], but you should have discussed it here and/or in discussion page before.
We did many efforts to widely discuss fire hydrant extensions [1] and finally approve them: you should at least discuss your proposal with people who spent so much time in this project.

Anyway, as a firefighter, I have to say that the opening direction is a marginal tag for firefighting purposes, because you don't need to know this information to choose on a map which hydrant to use to refill the fire engine.
But if you still want to add this information, we need to refine it, for this reason discussion is important.

The use of handedness=right / left is prone to error.
Normally on hydrants it is indicated the direction of opening and usually it is counterclockwise. But technically these hydrants' valves have right-hand threads (right handedness): you turn it clockwise to tighten the valve and close the hydrant.
So if you read on a hydrant the counterclockwise opening direction, you should tag it with handedness=right. This creates confusion to a normal mapper.

direction=clockwise/counterclockwise has similiar problem: you can intend it as the opening direction or as the thread direction (closing direction).

On the other hand, fire_hydrant:opening=cw / ccw is not self-explanatory, because someone can intend it as the number of openings (couplings).

Personally I would not add this tag at all.
But, if you still want to add this information, I think that something like:

opening:direction=clockwise / counterclockwise

As we did for most of the tags in [0], I would not use fire_hydrant: prefix because we want a slim database and because  opening:direction=* is (or can be) used for other objects, as doors, taps, etc.

[0] https://wiki.openstreetmap.org/wiki/Tag:emergency%3Dfire_hydrant
[1] https://wiki.openstreetmap.org/wiki/Proposed_features/Fire_Hydrant_Extensions_(part_2)

Best regards,

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