[Tagging] power=tower enhancement

[Volker Schmidt]

Just to make things a bit more complicated, there are also pylons
(Wikipedia: transmission tower, OSM:  tower=power) with three power lines
connected.
>From a map users point of view what is important? The position of the
pylons, and the overhead lines that you can see. Underground cables that
connect pylons can only be located by lay people in rare cases, and they
are not of interest to map users. So if we only want to map for that
category of users (and not for power specialists) it would be perfectly
sufficient to add optionally the number of lines that connects to the
pylon. The default would be 2. The tower with the riser would be
"power:lines=1" and the situation that I mentioned at the beginning would
be "power:lines=3", or something equivalent.
Pylons (tower=power) do never carry telephone lines.

Lower voltage power lines and telephone lines are carried on poles
(Wikipedia: http://en.wikipedia.org/wiki/Utility_pole, OSM: tower=pole).
Mapping the wires (which can be lower-voltage electricity, telephone,
fibre-optic cables) is practically impossible in built-up areas in some
countries (USA and Japan are two that spring to mind). Obviously a sequence
of telephone or electricity poles can be quite useful as orientation help,
when you are outside of built-up areas.

Volker

On 13 December 2011 15:14, Martin Koppenhoefer <dieterdreist at gmail.com>wrote:

> 2011/12/13 Erik Johansson <erjohan at gmail.com>:
> > On Mon, Dec 12, 2011 at 21:12, Nick Austin <nick.w.austin at gmail.com>
> wrote:
> >> 3) Where three cables meet one of two of them may come up a riser and
> >> it's impossible to tell which is the supply cable and which is leading
> >> to a destination.
> >> 4) When underground cables fail they are often abandoned and left in
> >> place. The ends of the cable are disconnected at the top of each
> >> riser.
>
> > I would really like you to expand on why adding
> > "riser=power_line;tele_communication"  would make things difficult to
> > map. Though I think it might be hard to visualize making accidental
> > deletions a worry.
>
>
> +1
>
> I'd suggest to use
> power:riser=yes instead of riser=power (to remain compatible if we
> should decide to map telco lines as well in the future, so we could
> use telecommunication:riser for those).
>
> cheers,
> Martin
>
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Volker SCHMIDT
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