> On 25 May 2024, at 22:38:20, Peter Elderson <pelder...@gmail.com> wrote: > > I like this proposal very much.
Thank you for the review and the comments. > One thing: by its nature, other naturals will overlap with natural=wadi, right? Any thoughts on that? I think that's a fairly common thing with features tagged with natural=* and we have some reasonable ways to handle it. First, where natural features overlap, their boundaries don't always coincide. In this case, the features can and should be mapped as separate elements. Mapping natural=scrub in an arid environment is a good example. There may be scrub in a wadi, but if so, there is likely also scrub in the areas outside the wadi's banks. So, the natural=scrub area need not share the same geometry as the natural=wadi area. Second, if the boundaries of the natural features do coincide precisely, the natural tag can have multiple values or the features can be mapped as separate ways with shared nodes. I don't know that this would be common when mapping wadis, but as a separate example, we use coincident ways when mapping sea stacks where the natural=coastline and natural=bare_rock polygons coincide but the two tags cannot be placed on the same element. Third, one of the defining characteristics of a wadi is a bed of unconsolidated and often poorly sorted alluvium. That is, sand, gravel, cobble, boulders, or the like. This can be mapped using surface=* in combination with the natural=wadi tag. > And, you say you can map it as a node. That seems a bit strange, because it's such an elongated feature. I don't think that's the preferred way to map a wadi, but just as natural=valley can be mapped as a node (per the wiki and established usage), it could be acceptable for natural=wadi. As with a valley, even though the banks of the wadi may be distinct, the start and end of the wadi may not be. Rather than making an arbitrary decision about the boundaries, a mapper may prefer to place a node at a central location to map the wadi. To add to that, many wadis have well-established names and are important landmarks. So, placing the name on the map with a node is valuable even if the boundaries of the wadi have not been mapped. -Kai _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
