[Tagging] Elevation and height on vertical features

Colin Smale colin.smale at xs4all.nl
Thu Jan 7 22:40:37 UTC 2016

Cliffs are never truly vertical. A bird's eye view from above will show that. If they are steep enough they could be modelled as a line, but in general we should allow for a polygon, with a high side and a low side.

On 7 January 2016 17:32:49 CET, Martin Koppenhoefer <dieterdreist at gmail.com> wrote:
>sent from a phone
>> Am 07.01.2016 um 17:14 schrieb Aaron Spaulding <Aaron at sachimp.com>:
>> Either of these models can be used. I think option 1 makes the most
>sense, but I’d like to know what the community consensus is.
>I've always thought of ele representing the lower part, which is clear
>for man made features like buildings or obelisks (elevation of the
>ground, then add height for the highest point at that spot). Now when
>it comes to vertical elements like cliffs, where you have ground on
>both ends, it admittedly becomes ambiguous, but my suggestion would be
>to define to use the lower end also in these cases for
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>Tagging at openstreetmap.org
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