[Tagging] Elevation and height on vertical features
chris_hormann at gmx.de
Thu Jan 7 16:32:56 UTC 2016
On Thursday 07 January 2016, Aaron Spaulding wrote:
> Hi all,
> I’ve been working on generating 3D meshes based on OSM data and I ran
> into a problem. Vertical features like 'natural=cliff',
> 'barrier=retaining_wall’ and 'waterway=waterfall' occupy two points
> in physical space, but because of the 2D nature of OSM its ambiguous
> which side of the feature that the ‘ele’ tag applies.
For cliffs mapping conventions say that you should put the line on top
of the cliff in case it is not exactly vertical - accordingly the ele
tag would also refer to the top - but keep in mind that the elevation
does not have to be constant.
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