On Thu, 28 Nov 2019 at 20:47, Volker Schmidt <vosc...@gmail.com> wrote:
> > > - First of all when I see a both-sided sloped linear elevation I do > not know I see a berm.because it is a rarely used term > > Can you see a pile of dirt? If so, it's a berm. If it's a bricks, blocks, rocks, concrete, wooden, steel or any other type of construction, it's not! I agree it's not very common in normal usage, but would be quite common in any engineering context, & there are any number of OSM terms which are very specialised! > > - Second it is ill-defined from the shape point of view: it can define > a step in an earth wall and it can mean an earth wall with sloped sides > > Yep, either one could be a berm. > > - Fourth it can describe man-made or natural objects. > > I saw reference to berm also being used to describe a line of debris thrown up on a beach by a storm, however, that wouldn't be a permanent feature, as it would be changed by the next storm, or human use of the beach, so we wouldn't map it. Let's go back and define what we need > Agree with everything you say here > > - (this tag is purpose-free) > > Sorry, I don't understand what you mean by "purpose-free"? Thinking about it we may only need to add a new man_made=slope_base tag. > Packaging this together with the opposite man_made=embankment in a "slope" > relation, this would give us the possibility to model even complex objects. > Without a relation a closed man-made=slope_base way could be used to draw > the footprint of levees/dykes. The use could be similar to water=riverbank. > I did suggest area=slope or similar, to map the area of levee walls in discussion about large flood control levees a couple of weeks ago, but it didn't seem to go down very well? Thanks Graeme
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