[Tagging] Let's get (quite) rid of units and their multiples in OSM values

François Lacombe fl.infosreseaux at gmail.com
Fri Jul 27 20:33:10 UTC 2018


Well okay
Given problem is how can we query maxspeed like :
[Maxspeed>25] ?

It's not possible while units are stored with values.

Then i agree that human display is a matter of tools, not database

François

Le ven. 27 juil. 2018 à 22:21, Tobias Knerr <osm at tobias-knerr.de> a écrit :

> On 26.07.2018 21:26, François Lacombe wrote:
> > Then store voltage=400000 is far way better but harder to be read by
> > humans also.
>
> I currently prefer explicit units in the database because they document
> the mapper's intent and avoid ambiguity.
>
> Defaults aren't always obvious. For example, people mapping pipelines
> have documented millimetres as the default for diameter=*, but it seems
> tree mappers haven't gotten the memo and (reasonably) assume it's
> defaulting to metres like height=*, width=* or circumference=*.
>
> When a value is actually signposted on the ground, it's most likely
> preferable to use the original unit and avoid conversions. Apart from
> that particular case, I can see some benefits of your suggestion – _if_
> you can convince the community to reliably agree on how unit-less values
> are interpreted.
>
> > https://wiki.openstreetmap.org/wiki/Map_Features/Units doesn't help
> > regarding such issues.
>
> It helps by providing data consumers with information they need to
> support both explicit and implicit units. Some have gotten around to
> implementing that feature, others haven't yet – but in principle, it
> seems entirely possible to support queries like [voltage>20 kV], to use
> your example.
>
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