I have stood in front of these large levees that prevent big rivers from flooding the surrounding country side many times her in Italy and did not find a suitable tagging for both the top and the bottom border lines of the object.
We have a similar problem with extended stairs for which there is a tagging scheme <https://wiki.openstreetmap.org/wiki/Stairs_modelling>, which could be transferred to the levee situation. I am not an expert in either levees nor staircase modelling - I only note the similarity of the problems. On Mon, 11 Nov 2019 at 10:16, Martin Koppenhoefer <dieterdre...@gmail.com> wrote: > Am Mo., 11. Nov. 2019 um 07:27 Uhr schrieb John Willis via Tagging < > tagging@openstreetmap.org>: > >> It seems I was (very) confused, possibly by misreading it several >> different times. I have mapped 40km of levees wrong, with an improper lower >> bounds line. I’ll have to fix it. >> I now understand that my embankment lines at the top are the (only) >> proper way to map the edge of the embankment. >> > I am interested in mapping the extent of the levee/embankments with some >> kind of outer/lower line, either as a single area or as 2 related ways for >> a levee. >> >> > > I agree we should have a way to map both limits, upper and lower, for all > kind of similar features, e.g. embankments, slopes, and similar. A relation > seems easier to evaluate and explicit, while a spatial query heuristic will > inevitably fail in some cases (lets not forget that we cannot assume that > OSM data is complete, having mapped the upper boundary of one embankment > and the lower of another, in proximity, and not having mapped the other > upper and lower boundaries, would not be considered an "error", just > incomplete data). > > > > >> it is interesting to me that a levee is a way that marks the >> “centerline", while the embankment maps the top edge of the slope - yet >> there is no documented way to map the *area* of the levees nor embankments. >> my “lower” embankment line (which is apparently very bad mapping) makes the >> extent of the embankments that make up a levee. while they sound simple, >> our levees are *covered with* parallel and intersecting roads. >> > some levees will have 5 parallel ways on them for different kinds of >> traffic. similar to man_made=bridge, showing the area used by a bridge is >> very useful. >> > > > maybe in case a road cuts through an embankment, you would have to map > several embankments (upper and lower boundaries) to represent it? > > Cheers > Martin > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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