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Features that do not exist

Resolved: Informal only applies to features, that do exist. --Hungerburg (talk) 09:32, 23 March 2021 (UTC)

Can we use this for features that truly do not exist?

For example, the paths mapped in the sports pitch example I placed, do not exist and are not "used" or indicated in any way. They are just suggested routes that people/routers should use.

The other examples seem to indicate that this tag should only be used on "unofficial" paths, but still have some sort of indication.

--Lectrician1 (talk) 19:05, 12 March 2021 (UTC)

I am bit ambivalent, as I believe the main principle for OSM mapping is "ground truth". Om the other hand ... IF you have observed that people use this shortcut (even just yourself and a few more), and it is OK to "announce" the shortcut to routing enginges, I would tend to agree that it is a good thing to map the "path" / walkable connection, and tag it as informal. Perhaps add trail_visibility=bad or none. It seems like you need to fix the link you included? I think it is most instructive to link to the way: osm:way/915310348 Or if you do not want that, drop the "edit" osm:#map=18/41.87139/-87.61886 But ideally perhaps you/we could find a clearer example where other "structures" on the map confuse the picture less? MortenLange --(talk) 22:16, 12 March 2021 (UTC)
One possible source of information for whether a shortcut is used has been to check out aggregated data tracking services, like Strava. --MortenLange (talk) 23:13, 12 March 2021 (UTC)
The example that was recently added does not belong here; 1) Openstreetmap is a collection of facts based on ground-truth. It is not a medium for mappers to tell people, where they ought to walk. 2) Even if using an exception to this concept, like for footways over squares, informal is still not the correct term. A namespaced proposed:highway:path might appropriate. --Hungerburg (talk) 18:53, 21 March 2021 (UTC)
@Hungerburg: The ground truth is that people can walk across the field in the manners mapped in the example. I also agree that informal is not the appropriate tag for this. Do you think we should have a tag like virtual=yes? --Lectrician1 (talk) 22:22, 21 March 2021 (UTC)
The ground truth, as you use the term, means that, as I (where I live) can cross a street anywhere I please, mapping any number of crossings there and tagging those informal will become sanctioned by the fine article. The ground truth, as I see it, there is a lawn on the ground in the picture you posted, and if indeed a number of people walk the lawn like this, it will soon look like in the other picture in the table, so the whole addition would be moot.
Note, that adding "virtual" or anything else to a path that does not exist on the ground is like adding construction, proposed, abandoned, disused, razed etc. to same. You are aware of the discussion on this issue and know why this is discouraged or even deprecated? And why life-cycle prefixes have been introduced, or why there is "highway=proposed; proposed=*" scheme? If you truly want to map non-existing features, "highway=virtual; virtual=routing_aid" might be a plausible too, anything but something, that already has a minimally concise meaning. --Hungerburg (talk) 23:06, 21 March 2021 (UTC)
disused=yes and abandoned=yes does show something that exist though? Only a different status. highway=virtual + virtual=routing_aid obviously loses what highway=* it is supposed to be (eg for highway=pedestrian + area=yes). You can try to distinguish a "path" on a surface built for movement (including a pitch), a "path" on an implicitly usable surface (eg lawn), and a "path" on a wild surface (eg countryside grassland) ---- Kovposch (talk) 07:33, 22 March 2021 (UTC)
You should reflect this discussion on Proposed features/highway link. ---- Kovposch (talk) 07:33, 22 March 2021 (UTC)
We should not use lifecycle prefixes or highway=proposed. We need a much more specific way to indicate such routable but nonexistant entities. --Lectrician1 (talk) 18:01, 22 March 2021 (UTC)
Lifecycle prefixes were meant as an analogy, one that still points out problems with naive approaches taken in the past. The lessons learnt then: Do not subkey an established tag with something that (even if only partly) reverts, or should I say, subverts the meaning that it has.
Please read "routing_aid" as a place holder in a highway=virtual;virtual=path|footway|cycleway, and if I fully understand the *=link proposal, also any other kind of highway.
Informal has a surprisingly well established and easy to convey meaning. Let's keep it that way.--Hungerburg (talk) 19:07, 22 March 2021 (UTC)
If they do walk across the field in the manners mapped, in preference to any other route, then I've got no objection to mapping it. However, if it's merely a can, and people actually take different routes (which I very much expect is the case with the situation in the image), then it shouldn't be mapped. --Carnildo (talk) 18:37, 22 March 2021 (UTC)
Regarding the sample picture, that has been up here, perhaps a tag to mark the lawn walkable would be cool; Nowadays, there are routers, that can do area routing avoiding obstacles, still far from perfect though, but a start.--Hungerburg (talk) 19:07, 22 March 2021 (UTC)

Adding Example for Mountain Bike Trails

I was thinking of adding to the list of examples, that mountain bike trails can be tagged with the informal=yes, to indicate a more informal process of creating bike trails. Does this sound like a good idea?--IanVG (talk) 13:18, 8 May 2021 (UTC)

First thought: These quite often are plain paths, that have been used for walking/hiking long since, sometimes informal ones anyway? And if not, then how to tell, to what the informal attribute applies: to the path, to the MTB tags? So, either nothing to gain, or adding a bit of confusion.
Second thought: Maybe I miss something? A means to mark illegal trails?--Hungerburg (talk) 19:38, 8 May 2021 (UTC)
I think it's a good idea. If the trail is there, traversable, but unsigned and otherwise appearing unofficial, it's probably informal=yes, whether it's legal or not. Bartee (talk) 18:59, 10 June 2021 (UTC)