On Wed, 13 Nov 2019 at 05:05, Richard <ricoz....@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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