[Tagging] Best practices regarding implied tags

[François Lacombe]

Thank you all for replies

Then the current proposal sounds to be ok regarding what is said upside.
I admit to automatically adding implied tags when importing data covered by
the proposal, so no apparent problem is mappers add them explicitly.

All the best

François

Le jeu. 17 sept. 2020 à 15:11, Kevin Broderick <ktb at kevinbroderick.com> a
écrit :

> +1.
>
> Explicit tagging indicates a level of confidence not generally associated
> with implicit tagging. While there's certainly an 'ad nauseum' level of
> doing so (e.g. adding surface=paved, motor_vehicle=yes to highway=motorway
> in the U.S. would be kinda silly, IMO), there are plenty of cases where a
> primary tag generally implies something about the tagged object but doesn't
> guarantee it. I'd point to the recent discussion of access= on driveways as
> an example; while most driveways allow for certain types of access by
> default, it's far from guaranteed—there may be a no-trespassing sign or a
> locked gate, and explicitly indicating the lack of such in the access
> tagging is helpful. (Adding the implied value without survey or other
> definitive knowledge is not, as then you express a higher degree of
> confidence than actually exists in the data).
>
> On Wed, Sep 16, 2020 at 6:34 PM Paul Johnson <baloo at ursamundi.org> wrote:
>
>> On Wed, Sep 16, 2020 at 5:20 PM François Lacombe <
>> fl.infosreseaux at gmail.com> wrote:
>>
>>> Is that completely wrong or mappers could eventually add implied tags if
>>> they want to?
>>> The proposal currently states they are optional and it won't raise an
>>> error if mappers add them beside mandatory tags.
>>>
>>
>> No, it's not wrong to add implied tags explicitly.  It's actually
>> encouraged in some cases where the implicit tag is not consumable by
>> automated system (such as the "none" default for turn:lanes tends to be
>> ambiguous between "you can't turn from this lane" and "you can't use this
>> lane" and "there's an implicit but unspecified implication that isn't
>> painted on the ground"), or access defaults (such as in the US where
>> bicycle=* and foot=* varies a lot on highway=motorway)
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>
>
> --
> Kevin Broderick
> ktb at kevinbroderick.com
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