2017-01-09 13:15 GMT+01:00 ael <law_ence....@ntlworld.com>: > This thread has reminded me that I have encountered problems with > mapping disused quarries and surface mining. > > The quarries that I have in mind are major geographical features - they > have not been filled in. I tried tagging them as landuse=quarry and > disused=yes. If landuse really does mean current use of an area, that > looks contradictory. Often such old quarries are now in use for > recreation, often the water filled part for watersports. So perhaps that > is "land"use=recreation or landuse=quarry;recreation? It seem clear that > there is a problem here. A (large) quarry is perhaps geographical rather > than landuse? >
+1, I completely agree with your assessment: a quarry can often be significant after people have stopped extracting minerals. I can be publicly accessible and used for recreation, which allows us to tag the recreational function, but we miss on the physical aspects, i.e. that it has been a quarry. You might tag it like disused:landuse=quarry, but the tag sounds a bit like an oxymoron. Maybe historic=quarry? > I have the same problem with historic surface mining areas: these are > major features on the landscape, often with very large excavations, and > need > recording/rendering, yet now are "just" moorland or have other uses. > Again, I didn't think landuse=surface_mining + historic + disused worked > and certainly didn't render. > +1, very similar case. As an alternative to disused:landuse=* you could use historic=surface_mining (but it will typically be a very huge polygon) > I am tempted to bring up the case of major bridges which are parts of > abandoned railways not being rendered. While that really is a bug in the > renderers, if we had some tag for major physical features that would > be rendered regardless of any historic or disused tags. it would solve > many such problems. > this has already been solved when bridges were introduced to OSM (relatively recently). For many years, OSM didn't have a way to map bridges and was relying on indirect mapping methods (state on a highway or railway that it runs on a bridge, the bridge=yes property, or connect several of those ways that run over a bridge with a bridge relation). Now there is man_made=bridge, pretty established and even rendered in the main style. Cheers, Martin
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