[Tagging] Mapping cave tunnels passable by human

[Mateusz Konieczny]

2014-08-14 13:01 GMT+02:00 Friedrich Volkmann <bsd at volki.at>:

> Given that you want to discuss wiki changes, you should start the
> discussion
> before you actually do the changes. You should also refer to this mailing
> list thread in the comment of your wiki change, or in the talk page. I
> received an automated notification that you changed the wiki and did not
> know about the mailing list thread, so I corrected the wiki. Now I am
> surprised that there's a discussion in another medium.
>

Probably it would be better, but I thought about mailing list after making
edit.


> I also do not understand why you connect highway=path with private access.
> Paths may or may not be publicly accessible, as are footways. Footways are
> by definition even more restricted, namely to pedestrians.
>

It was not about accessibility but about fact that highway=footway is
accessible
for pedestrians (in this case typical tourist) and highway=path may be
nearly
anything, depending on additional tags (in this case it is accessible only
for
more experienced speleologists).

But it is probably overly subtle and useless distinction (like natural=wood
and
landuse=forest) clear only for small amount of people and therefore it is
good that
it is gone.


> No, they do not fit. Caves are complex three-dimenional structures. In most
> caves there are no paths. You go or climb or rope down whereever you feel
> like.
>

Probably my bias, caves that I know (Kraków-Częstochowa Upland) may be well
represented using ways. But at the very least it is possible to represent
footways
designated for inexperienced tourists, especially in show caves.

There is no scheme, and I doubt that cave maps belong in a geo database.
> Cave maps are very detailed, and there are special applications for cave
> rendering. For Austria, there's also a database called Spelix, accessable
> via web browser. It contains cave surveys and maps, photos and other data.
> Getting all of that data to OSM would mean continuous duplicated effort and
> yet the data in OSM will never be as complete as the original data. I have
> surveyed a lot of caves and for sure I will not draw all of my cave maps
> again only to get them into OSM. If you are interested in caves, get access
> to dedicated cave databases.
>

This is a poor argument, OSM duplicates many existing databases (imports do
this
by definition).

> I wonder about adding something that would denote that way is part of
> cave,
> > maybe natural=cave_tunnel?
>
> See above. A tunnel is not a cave. If you want to express that a way is
> underground, use layer=-1.
>
> Layer < 0 does not indicate that something is underground.
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