[Tagging] Feature Proposal - RFC - Hazards (mine shaft)

ael witwall3 at disroot.org
Fri Nov 27 13:34:01 UTC 2020


On Thu, Nov 26, 2020 at 04:01:09PM -0500, Brian M. Sperlongano wrote:
> On Thu, Nov 26, 2020 at 3:41 PM ael via Tagging <tagging at openstreetmap.org>
> wrote:
> 
> > On Thu, Nov 26, 2020 at 09:11:25AM -0500, Brian M. Sperlongano wrote:
> > > I am not opposed to including unsigned hazards
> >
> > There are a surprising number of abandoned open mineshafts in the far
> > West of England which are a hazard, if not an extreme hazard. Not all
> > of these are signed or fenced. You might have noticed some of them when you
> > trawled through the existing usage.
> >
> > It would be absurd to require such cases to be "signed": those are the
> > least hazardous by virtual of the signage.
> 
> Ok, I'm convinced that unsigned hazards are acceptable to be signed!
> 
> In the case of open mineshafts, there is already an approved tag
> man_made=mineshaft with 10,000 usage (and a similar de facto tag for
> horizontal shafts, man_made=adit with 12,000 usages).

A mineshaft is not a hazard if it is properly protected or capped or
whatever. So there is no need for a hazard tag in the majority of cases.

As a result, the
> hazard key hasn't really been used for this -- there is a
> hazard=open_mineshaft with 5 usages, and a single use of hazard=mineshaft.
> I'm not sure if all mine shafts are hazardous or only some of them, but in
> any case, I would think that man_made=mineshaft + hazard=yes would make
> more sense than a a mineshaft-specific value.

Well, that is better than nothing, but I don't see why a more specific
value is not useful. The hazard might be toxic effluent coming out of
a (probably disused) mineshaft. There are even cases where there can be
toxic fumes as the result of bacterial activity.

For back ground, many of the open mineshafts in Cornwall come from the
long (even pre-historic) undocumented mining history. Many old shafts
were capped with timber supports that have since rotted away and shafts
suddenly appear unexpectedly. Other shafts are covered in undergrowth
and may have never been capped. Pets and people are regularly rescued
from such places.

Adits are normally much less hazardous by virtue of being approximately
horizontal. Of course, if an inexperienced person chooses to enter then
they may well be exposed to many hazards, and maybe that could be tagged
as well, but apart from perhaps the risk of  rock fall/collapse, I would
think tagging underground features is at least problematic in OSM.

ael




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