Hi !
Around this area : https://www.openstreetmap.org/#map=16/50.9034/14.2763
<https://www.openstreetmap.org/#map=16/50.9034/14.2763> there is a flagrant
misuse and abuse of the usage of the natural=cliff tag. It is used to map the
iso altitude lines and not real cliff as stated in the WIKI :
A cliff <http://en.wikipedia.org/wiki/en:cliff> is a vertical or almost
vertical natural drop in terrain topography as it occurs for example in form of
coastal cliffs or escarpments. The face of the cliff usually consists of bare
solid rock but can occasionally also consist of clay, compacted sand, ice or
other solid materials.
When not to use
natural <https://wiki.openstreetmap.org/wiki/Key:natural>=cliff <> should not
be used for ridges, i.e. crests where there is a significant drop in terrain to
both sides and neither of them is close to vertical. Use natural
<https://wiki.openstreetmap.org/wiki/Key:natural>=ridge
<https://wiki.openstreetmap.org/wiki/Tag:natural%3Dridge> or natural
<https://wiki.openstreetmap.org/wiki/Key:natural>=arete
<https://wiki.openstreetmap.org/wiki/Tag:natural%3Darete> instead. Also do not
usenatural <https://wiki.openstreetmap.org/wiki/Key:natural>=cliff <> just for
mapping an inclined bare rock surface, use natural
<https://wiki.openstreetmap.org/wiki/Key:natural>=bare_rock
<https://wiki.openstreetmap.org/wiki/Tag:natural%3Dbare_rock> instead.
I already removed the natural=cliff ways mapped by MichaOSM after asking him to
fix this but without response the changeset comment was :
"Felsen, Riffe, Topografie nach GeoSachsen digitale Geländemodellhoehenlinien
2.5m, digitales Geländereliefmodell, DTK10, topografische Karte”
For example this changeset :
https://www.openstreetmap.org/changeset/66373825#map=15/50.9016/14.3093
<https://www.openstreetmap.org/changeset/66373825#map=15/50.9016/14.3093>
It say that it used a 2.5m topographic map to map all these false cliffs in
this area, he was mapping the topography (MNT) and this is forbidden in OSM.
Regards,
Vlad.
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