Hi
I map quite few radio sites in connection with my work. Usually it is
just mast/tower locations using the 'man_made=tower +
tower:type=communication' tags with name/operator information. There
are quite few things for these towers that could be improved. For
example the difference between a tower and a mast - a mast in the UK is
normally considered to have guy wires to hold it up. where as a tower
supports itself. May masts are big enough to justify the guy wires
being mapped with their ground anchor points. I am not aware of anything
suitable to do that.
There is also their feed line systems. I have used power=line to map
some of these, as in this example in Burma:
https://www.openstreetmap.org/#map=18/16.86624/96.16177
It is not ideal, but the closest I could think of. Medium-wave
broadcasts sites typically have very long feeder systems that can be
mapped, as in the example.
As for the antennas mounted on a mast/tower, you then may need to
consider the frequencies and operators that use the antennas. In some
cases there will be multiple frequencies and operators. Physically, you
would need the antenna height above ground level, direction, possibly
which leg it is on and so on.
Lots to think about.
Regards
Dave
On 15/07/2015 12:25, François Lacombe wrote:
Hi,
I just wanted to share some thoughts about antennas and radio supports
mapping on this list.
There are currently several tags in use to map telecommunication or
radio broadcast supports :
man_made=tower + tower:type=communication
man_made=telecommunication_tower
and so on...
but this won't allow us to add antennas on them at all or describe how
these supports are used.
Antennas and stations (relations of supports + antennas + cabinets)
may be interesting too.
Some French mappers and I are currently looking for a sustainable
model to map radio sites, radio stations, supports and antennas since
our regulator allows free datasets to be downloaded and part of them
can be added on the map (Etalab license compatible with OdBL).
The point is to add references (ref:FR:ANFR) on right objects first as
for linking to the whole dataset which shouldn't be imported in OSM
(only technical data and not so geographical)
I've proposed such things (unfortunately only in French for the
moment) but it's not finalized or transposable on the map
http://wiki.openstreetmap.org/wiki/File:Radio_antennas_mapping_proposal.png
The problem is to add several antennas on the support itself
(sometimes on masts, sometimes at the top of buildings).
Supports can be composed of several decks and several antennas can
share same lat/lng (but different elev) and currently can't be added
as nodes. Relations can really be a pain to maintain in such situation
too.
May someone have idea and help solving the issue without adding 3rd
dimension to OSM model?
Cheers
François
--
*François Lacombe*
fl dot infosreseaux At gmail dot com
www.infos-reseaux.com <http://www.infos-reseaux.com>
@InfosReseaux <http://www.twitter.com/InfosReseaux>
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