Hi, On Fri, Sep 06, 2019 at 02:42:06PM +0200, Vladimir Vyskocil wrote: > 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.
I know that area very well and I can assure you, that natural=cliff is no misuse under this definition. The area is full of rock towers like those: https://commons.wikimedia.org/wiki/File:20171124195DR_Lohmen_Basteiaussicht_zum_Sieberturm.jpg That's what you see on the map. > 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. You missunderstood, he was mapping rock edges. A terrain model is more helpful for that task than arial imagery. We have permission to use the terrain model for OSM as far as I know. I would kindly request that you reinstate deleted natural=cliffs for the moment. If you are still not convinced from the photo above that the tagging is correct then we need to have a fundamental discussion first about how to tag these kind of rock towers. But that would rather be something for the tagging mailing list (or talk-de if you want to get the locals involved). Sarah _______________________________________________ talk mailing list [email protected] https://lists.openstreetmap.org/listinfo/talk
