Poorly-documented tags

https://wiki.openstreetmap.org/wiki/Key:department

The department of a university, organization, business, etc. that is responsible for, associated with, or relevant to the feature being mapped.

The wiki does have some mention of this tag, but it is woefully incomplete and ill-defined.

ex.

• https://wiki.openstreetmap.org/wiki/Tag:operator=Appalachian State University
• https://wiki.openstreetmap.org/wiki/Tag:operator:type=public
• https://wiki.openstreetmap.org/wiki/Tag:department=Department of Philosophy & Religion

Undocumented tags

https://wiki.openstreetmap.org/wiki/Key:scenic-related tags

https://wiki.openstreetmap.org/wiki/Key:scenic:name

The name of a way designated as a scenic way by some sort of authority, assuming this name is different from the usual/common/most signed name of it.

There’s one way using https://wiki.openstreetmap.org/wiki/Key:name:scenic, which is also not a documented tag, but https://wiki.openstreetmap.org/wiki/Key:scenic:name I feel makes more sense. scenic_name is also an option, but I think it’s better to use https://wiki.openstreetmap.org/wiki/Key:scenic:name as it makes the name be more obviously contingent on the scenic designation of the way.

ex.

• https://wiki.openstreetmap.org/wiki/Tag:scenic:name=New River Valley Byway
• https://wiki.openstreetmap.org/wiki/Tag:scenic:name=US 421 Scenic Byway

https://wiki.openstreetmap.org/wiki/Key:scenic:authority

The authority that designated this way as being notably scenic.

ex.

• https://wiki.openstreetmap.org/wiki/Tag:scenic:authority=NC Scenic Byways Program

Uncommon sources

https://wiki.openstreetmap.org/wiki/Tag:source=NC Scenic Byways 4th Edition

… See full entry