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

Andrew Hain andrewhainosm at hotmail.co.uk
Fri Jul 27 12:19:26 UTC 2018

My own preference is to have no (zero) units in the database, decimals where wanted (maxwidth=2.2) and unit management support in editors.

From: Warin <61sundowner at gmail.com>
Sent: 27 July 2018 12:27:04
To: tagging at openstreetmap.org
Subject: Re: [Tagging] Let's get (quite) rid of units and their multiples in OSM values

On 27/07/18 21:11, Martin Koppenhoefer wrote:
> sent from a phone
>> On 26. Jul 2018, at 21:26, François Lacombe <fl.infosreseaux at gmail.com> wrote:
>> I don't want to break things but only improve them, all the best
> one issue with using only one unit for a tag is that they can’t always be transformed without rounding. E.g. maxspeed=55mph cannot be converted to kph without losing information
> Also, shorter notations are better readable, hence reduce the likeliness of errors not noted.
> On the other hand, I agree in the example of voltage it would make it easier for queries to use the same unit. (you still can make queries, but they are more complicated if you have to take units into account)

Unfortunately not everyone uses the same units... heights are in meters, feet .. depending on where you come from or what activity you follow.

Voltages are in volts so the same units... but multiplies are common for high voltages .. no one uses 33000 volts .. they all use 33 kv.
If you stipulate that all voltages have to be in kv then 115 v becomes 0.115 kv, 240 v becomes 0.24 kv and 415 v becomes 0.415 kv ..
that is not how people talk about these things.

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