[Tagging] Default maxspeed unit on waterways

Dan S danstowell+osm at gmail.com
Wed Oct 29 14:23:55 UTC 2014

2014-10-29 14:07 GMT+00:00 Pieren <pieren3 at gmail.com>:
> On Wed, Oct 29, 2014 at 2:52 PM, Tom Pfeifer <t.pfeifer at computer.org> wrote:
>> km/h is derived, at least with an integer multiple of seconds,
>> from SI units. mph and knots are not. I would prefer to keep
>> one default unit per tag, consistently, everything else leads
>> to confusion.
> What is leading to confusion is to suggest that km/h is the default
> unit for waterway speed when  knot is in use everywhere.

Pieren, is there an example of confusion actually being caused?

> Please think
> as a contributor, not as QA programmer or data consumer (it's easy to
> check if the speed limit belongs to a waterway or not).

It's easy to think up potential for confusion whichever way we go on
this. Thinking as a contributor, the editing interfaces should make it
clear which units the user is stating/implying - as iD does, for
example. I definitely sympathise with Tom's reasoning for one unit per
tag, so I'd suggest there would need to be a strong case for this
mixed-units approach...


> And "The knot is a non-SI unit that is "accepted for use with the SI"
> (https://en.wikipedia.org/wiki/Knot_%28unit%29)
> Pieren
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