[Tagging] Best practices regarding implied tags

François Lacombe fl.infosreseaux at gmail.com
Sun Sep 20 16:43:42 UTC 2020

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


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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