On Mon, May 15, 2017 at 1:59 PM, Zecke <[email protected]> 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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