[Tagging] change recommendation from "depth" to "length" for the adit length?

[Michal Fabík]

On Mon, May 15, 2017 at 1:59 PM, Zecke <zecke at historic.place> wrote:

> Am 15.05.2017 um 11:47 schrieb Michal Fabík:
>
>
>
>> Shouldn't the tag be "man_made=adit_portal"
>>
>
> Why not just man_made=adit_entrance? I'm not sure I'd call a crudely dug
> opening (like the one in the picture on the Wiki page) a portal. (Maybe
> it's just me.)
>
> An "adit" is by definition an *entrance *to a subterranean gallery or
> drift.
>


I googled some dictionaries at random and most, if not all, say that an
adit is a passage (ex.: http://www.coaleducation.org/glossary.htm). Sure,
the whole passage also serves as an entrance to the mine, but that doesn't
prevent the adit itself from having an entrance. I think the word
"entrance" is rather unfortunate because it can denote one point in space
(a node in our case) as well as the whole space (passage, tunnel, corridor
etc.) that serves to access a bigger structure (the whole mine).



> man_made=adit is a well-established and well-defined tag.
>

Well to me, mapping an adit with a single node is like mapping a tunnel
with a single node.


> There are people who already map the gallery indicated by the adit, using
> layer=-1 or similar.
>


I did a quick overpass search for ways tagged as adits and some of the
cases are interesting, to say the least:

http://www.openstreetmap.org/way/108932116
http://www.openstreetmap.org/way/33139563
http://www.openstreetmap.org/way/220961406
http://www.openstreetmap.org/way/372881519
http://www.openstreetmap.org/way/134806997

This one looks more meaningful, but even here the entrance (i.e. the gaping
hole) is just implied where the adit meets the retaining wall, rather than
being mapped explicitly:

http://www.openstreetmap.org/way/381615454


-- 
Michal Fabík
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