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

[Zecke]

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. No need to enforce this by inventing new tags that are just a 
tautology. man_made=adit is a well-established and well-defined tag.

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

Cheers,
Carsten
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