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

LM_1 flukas.robot+osm at gmail.com
Mon Feb 20 12:06:08 GMT 2012

As I understand it option a) is correct. If put on a building it would
mean that the ground level is at this height. In some specific cases
this might bring problems though: imagine a lot of stones and earth is
transported on the hilltop, the elevation clearly changes. If you
build a building there the elevation is unchanged. Now what if you
cover this building with earth to look more natural? How thick layer
of earth is required for the elevation to change?
But these cases will be uncommon and I still vote for a)

Lukáš Matějka (LM_1)

2012/2/20 Martin Koppenhoefer <dieterdreist at gmail.com>:
> On the German ML we are currently discussing how to applicate "ele" to
> towers (and similar situations). There is consensus that the key
> "height" is describing the height of the structure from the ground to
> the top. 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).
> There are 2 alternatives:
> a) ele is the elevation of the ground around/below the tower (in the
> case of a mountain summit it would be the elevation of the mountain,
> not the tower).
> b) ele is the elevation of the highest point at the tagged spot, i.e.
> the top of the tower
> Comments welcome. The idea is to clarify this aspect on the wiki page
> for the key "ele".
> cheers,
> Martin
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