[Tagging] Elevation and height on vertical features

Warin 61sundowner at gmail.com
Thu Jan 7 21:50:02 UTC 2016

On 8/01/2016 3:32 AM, Christoph Hormann wrote:
> 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.

Consider who is going to use the map, and for what purpose.

The most critical use is for aeroplanes .. where the maximum height is 
critical information!
I think for that reason alone most maps should indicate the maximum 
elevation of an object.

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