On 29/07/2019 13:05, Paul Allen wrote:
It applies to more than just quarries. The problem is that the
namespaced version, when
applied to physical objects, renders them invisible (on standard carto).
Please let's just stop worrying about just that one renderer...
It's fine with usages. I've mapped pubs that have recently closed and
it is uncertain if they
will re-open as a pub, re-open as something else, be turned into a
residence or the
building itself become disused. I've been tagging them as
disused:amenity=pub
Some people with what I view as an over-strict interpretation of rules
may say that's
mapping the history of the thing and OSM doesn't map history, but I
ignore them.
It's perfectly possible for renderers to make sense of namespaced tags
(and even, with a bit more difficulty, tags such as "landuse=quarry;
disused=yes") and do whatever they want with them (obligatory example
https://github.com/SomeoneElseOSM/SomeoneElse-style/blob/master/style.lua#L1496
and
https://map.atownsend.org.uk/maps/map/map.html#zoom=20&lat=53.9994944&lon=-1.136121
).
As already mentioned the tricky bit is working out what "disused" means
for e.g. a quarry. A map that wanted to show actual places where rock
was extracted wouldn't show an inactive hole in the ground, whereas one
that wanted to show holes in the ground would still show them.
However, there are several buildings in my town that are clearly
disused. Peeling paintwork,
broken windows, no sign of activity for many years. If I use
disused:building=yes they
vanish from the map but they're observable in reality, which means the
map doesn't
show something that is physically present. Using disused=yes is a way
around this.
Call it tagging for the renderer if you want, but it's not lying for
the renderer.
A building that isn't used for anything is still in actuality a building
(until it falls or is knocked down), so I probably wouldn't use that tag
personally, although there is mid-level usage in e.g. the UK:
https://overpass-turbo.eu/s/L9H .
Best Regards,
Andy
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