On 10.01.2017 10:47, Zecke wrote:
Artificial rock faces in quarries and open pit mines, called berms,
are created due to blasting. The faces are typically inclined 60-70°
with drops of max. a few tenth of meters. This fundamental difference
might be best taken into account by using man_made=embankment for these.
I have to contradict in one point. I know of a lot of former and present
quarries where the faces are inclined 90° and ten'ths of meters high.
Maybe this is not so much the point for open pit mines. But tagging
should be ready to cope with non-natural steep faces. I see no problem
however in using some man_made key for this. "embankment" might be
misleading, however. What about man_made=cliff for non-natural steep drops?
The renderer then could decide whether to choose differentiating
drawing. (Most probably he won't do so).
Yes, the OSM-definition for man_made=embankment covers other purposes
and should not be used for a cliff in a current or former quarry.
I would not be in favour of a new man_made=cliff tag, since it was not
man's intention to erect e cliff, it was the intention to dig out the
material. I still see natural=cliff applicable, combined with a sub-tag
if needed.
As for the angles, I have climbed on cliffs formed by erosion (includung
sea cliffs) and in former quarries, which can have all angles from
leaning, vertical to overhanging.
tom
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