[Tagging] Additional detail of Levee mapping via embankments

Volker Schmidt voschix at gmail.com
Mon Nov 11 10:40:35 UTC 2019


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 <dieterdreist at gmail.com>
wrote:

> Am Mo., 11. Nov. 2019 um 07:27 Uhr schrieb John Willis via Tagging <
> tagging at 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
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