[Tagging] Additional detail of Levee mapping via embankments

Graeme Fitzpatrick graemefitz1 at gmail.com
Tue Nov 12 21:04:42 UTC 2019


On Wed, 13 Nov 2019 at 05:05, Richard <ricoz.osm at gmail.com> wrote:

>
> We need new tags for the bottom of embankmets, top of cuttings, bottom of
> cliffs, earth_banks
> and maybe a few others if we want to map them.
>
> Imho all those should be tagged ways such as cliff:base, relations could
> be used optionaly
> to relate a particular cliff edge to a particular cliff base which would
> define the
> area of the slope.
>
> Here is what I see:
> * man_made=embankment_base or man_made=embankment:base
> * man_made=cutting or man_made=cutting:top - top edge of cutting in
> analogy to
>   man_made=embankment (126 pieces in database but straightforward to
> extend)
> * natural=cliff_base or natural=cliff:base
> * natural=earth_bank_base or natural=earth_bank:base
>

Just a thought - how about a new area tag to show the "sides" of these
features, something like natural=slope?

You have your line to mark the top edge of the cliff or embankment, then
mark the visible area of the wall / side / bank down to it's base as the
=slope, which would be much simpler than mucking around with relations
(which I, & apparently quite a few others, don't really understand?)

Could also have height to say this bank is 5m tall; normal land cover tags
would apply to say it's grass, scrub, bare rock etc; incline to show it's
at 45° & so on.

Would also be nice if it rendered, perhaps as either fine diagonals or
cross-hatching (of course, the ideal would be if it rendered like map
contour lines - on a gentle slope the lines are wide apart, getting
narrower together as it get's steeper :-))

& when I've just had a look, natural=slope has actually been used 1466
times, https://taginfo.openstreetmap.org/tags/natural=slope#overview,
despite being undocumented - searching the wiki for "slope" takes you to
the "incline" page https://wiki.openstreetmap.org/wiki/Key:incline, which
appears to for intended for roads?

Possible?

  Thanks

Graeme
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