Mapping of things that cannot be verified on-the-ground has to be a very special case. Such as underground power cables.
A currently active landfill and a completed/capped-off landfill are not the same thing. One is verifiable on-the-ground, the other is not. One has a [surface] landuse of being a waste dump, the other has been returned to another landuse such as building or using as a park. Sure, under the surface there is some waste, but I don't believe the purpose of OSM is to map the subsurface. Ex-landfills are notoriously difficult to spot and, in the UK at least, people just didn't keep records because "out of sight, out of mind". Geodata for ex-landfills is much prized in the property environmental risk industry. On Thu, Feb 20, 2020 at 10:05 AM Martin Koppenhoefer <dieterdre...@gmail.com> wrote: > Am Do., 20. Feb. 2020 um 10:54 Uhr schrieb Cascafico Giovanni < > cascaf...@gmail.com>: > >> Hello, >> >> I've an OSM compatible dataset that helps me to spot landfills. Older >> ones are already covered by grass and/or trees. >> >> IMHO could be useful to save landfill locations for a future possible use. >> Does it make sense tag the ones with surface alterations with level=-1 ? >> >> > > IMHO, landuse is not stacked, at least not in a case like this (there may > be some exceptional situations, eventually). The fact that the landfill is > overgrown still makes it a landfill, and all the toxic stuff is still > there, just covered by a thin layer of soil and vegetation. > > > > Or shall I consider landuse=landfill as a functional tagging, hence >> tagging them abandoned:landuse=landfill? > > > > that's a good question. Landuse is not completely consistent. There are a > few landuses like quarry, landfill and even "harbour" which do not > integrate well with the other landuses because these mentioned are > typically used _also_ for features (i.e. if you split a landuse=quarry, you > will have 2 quarries, opposed to e.g. landuse=residential, which simply > says this area is used as residential area, and if you split it, the > meaning remains the same, i.e. it is a property about the use of land). > > A possible solution would be the introduction of feature tags for these > outliers, e.g. man_made=quarry, man_made=landfill / waste_dump, seaway=port > / cargo_port / fishing_port etc. > > Cheers > Martin > > > > > > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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