[Tagging] Additional detail of Levee mapping via embankments

John Willis johnw at mac.com
Mon Nov 18 23:16:43 UTC 2019

On Nov 19, 2019, at 6:53 AM, Richard <ricoz.osm at gmail.com> wrote:
> Other than that, "dyke_area" or "area:dyke" in analogy to 
> https://wiki.openstreetmap.org/wiki/Key:area:highway ?

I think dykes/levees are made of inner and outer embankments, and pairing them might be the only way to do it properly. 

Whatever is decided for embankments (I will work on some examples today) I think a levee/dyke will have to be a relation of *some* sort (built on top of the existing man_made=dyke tag) - either a relation of this way plus: 
- 4 “levee lines (inner&outer top+bottom)
- 2 embankments+ 2 embankment_area polygons
- 4 embankment lines. 

Mapping them as a total area (lower inner to lower outer) with a single polygon with the man_made=dyke as the “top” down the middle is unacceptable to me. The “top” is often a mappable area (with large levees worthy of this detail). If it big enough to need this detail, it has a pretty large and varying top area as well (as examples have shown). 

Also, The ship has sailed on “levee” - the term in OSM is dyke. 


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