----- Original Message -----
From: "M∡rtin Koppenhoefer" <[email protected]>
To: "Nathan Edgars II" <[email protected]>
Cc: "Tag discussion, strategy and related tools" <[email protected]>
Sent: Saturday, September 11, 2010 5:08 PM
Subject: Re: [Tagging] tagging towers WAS Re: tall masts supported by
guywires
2010/9/11 Nathan Edgars II <[email protected]>:
On Sat, Sep 11, 2010 at 11:39 AM, M∡rtin Koppenhoefer
<[email protected]> wrote:
2010/9/11 Nathan Edgars II <[email protected]>:
It's a guyed tower.
a tower is "self-supporting", which might be read as contradictory to
guys (unless you consider the guys being part of the tower itself).
Then explain the heavy use of "guyed tower" by professionals:
http://www.google.com/search?q=%22guyed+tower%22
You may be using the dictionary definition of tower (though the
dictionaries I checked don't rule out guy wires on a tower), but it's
apparently not a distinction that's always made in the real world.
well, probably a "guyed tower" is a such (complete term) and not a
"tower". A tower can (structurally) usually be regarded a cantilevered
system, see this schema:
http://upload.wikimedia.org/wikipedia/de/0/09/Eulerfaelle1.png (the
first case on the left).
I'm not really (at this point of the discussion) objecting against
tagging those (with appropriate subtags) as man_made=tower in OSM, but
I wanted to raise the awareness that it is structurally not correct.
We might discuss this and come to the conclusion, that for simplicity
reasons we might still tag these as tower.
What do you think about the changes to tower:construction and
suggested extended subtagging?
My personal opinion is that the man_made=tower tag is getting a bit generic,
in that it seems to be for any man made structure which is tall.
Personally I'd like to see a different top level tag to differentiate
between more solid structural towers such as towers
http://www.visitingdc.com/images/eiffel-tower-picture.jpg
http://www.canadaphotoseries.com/files/canada/images/Toronto-CN-Tower.jpg
http://media-cdn.tripadvisor.com/media/photo-s/00/13/f5/fa/qutab-minar-tower.jpg
and what are more commonly thought of as "masts" (though I accept that the
industry definition of these probably are lattice towers, or solid towers)
such as
http://en.wikipedia.org/wiki/File:Rowridge_from_entrance_gate_200704270010.jpg
http://www.cuphosco.com/images/GSM1.gif
though I accept that there will be problems in cases such as
http://www.freefoto.com/images/04/02/04_02_58---Mobile-Phone-Mast_web.jpg?&k=Mobile+Phone+Mast
where is this a tower, or a mast, according to my definition above?
David
cheers,
Martin
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