[Tagging] tagging of "ele" / elevation data e.g. in the context of towers

Martin Koppenhoefer dieterdreist at gmail.com
Mon Feb 20 13:37:05 GMT 2012

Am 20. Februar 2012 14:21 schrieb Volker Schmidt <voschix at gmail.com>:
>> There is consensus that the key
>> "height" is describing the height of the structure from the ground to
>> the top.
> +1   (I think there is no other way of doing it)

well, you could say that height is the maximum vertical extension and
thus also comprising the underground part of a structure.

>> There is also consensus to tag elevation data in WGS84 (so
>> that numbers in local systems would typically have to be converted
>> before you can enter them).
> I do not understand what that means. For me height is always in meters, and
> meters don't change with the system of reference (unless they move close to
> the speed of light )

It's not the meters that change, it is where you set your 0.00 level
that is changing

>> b) ele is the elevation of the highest point at the tagged spot, i.e.
>> the top of the tower
> I would say abolutely not, even though there are examples where, say a
> restaurant on top of a tower gives the elevation from see level, but that
> most likely be altitude and not elevation.

well, this is what one could read from the current wiki definition
(which we could make less ambiguous after this discussion).


More information about the Tagging mailing list