[Tagging] mast / tower / communication_tower (again)

[Michael Booth]

Hi,

I opened an issue on the rendering of man_made=communications_tower on 
the standard layer over on OSM-carto: 
https://github.com/gravitystorm/openstreetmap-carto/issues/3414 and 
think there should be a discussion about the tagging as well.

The Wiki definition is: *"**a huge tower for transmitting radio 
applications.... It is often made from concrete and usually a far 
visible landmark."* 
https://wiki.openstreetmap.org/wiki/Tag:man%20made=communications%20tower

Looking at examples of this tag in OSM I would guess that out of the 
<4,000 objects worldwide most of them do not conform to that definition. 
Many of them are small mobile phone/cell site "masts", towers less than 
100m, or very tall guyed masts.

I'd like to retag the structures near me to something more suitable - 
however the wiki pages aren't very clear in distinguishing between the 
various constructions and sizes for masts and towers.

Hopefully people can agree that the following should be tagged as 
man_made=mast or tower + tower:type=communication + tower:construction + 
height? Using TV transmitters in the UK as examples:

  * mast - guyed lattice, 306m:
    https://en.wikipedia.org/wiki/Durris_transmitting_station
  * mast - guyed tube, 351m:
    https://en.wikipedia.org/wiki/Belmont_transmitting_station
  * tower - lattice, 219m:
    https://en.wikipedia.org/wiki/Crystal_Palace_transmitting_station
  * tower - freestanding, 330m:
    https://en.wikipedia.org/wiki/Emley_Moor_transmitting_station

But how should these examples be tagged in OSM? All of them are 
self-supporting structures, so in engineering terms they are not masts.

 1. https://binged.it/2xILZO9
 2. https://www.geograph.org.uk/photo/2361955
 3. https://www.geograph.org.uk/photo/2337468
 4. https://en.wikipedia.org/wiki/Charwelton_BT_Tower
 5. https://www.geograph.org.uk/photo/2053885
 6. https://binged.it/2xTxcQK
 7. https://fr.wikipedia.org/wiki/Tour_hertzienne_de_Villeneuve-d%27Ascq
 8. https://www.geograph.org.uk/photo/2162874

Fortunately all three of the tags are now all displayed on the standard 
layer so there shouldn't be any tagging for the renderer. But it would 
be good to fix the definitions and make the wiki much clearer, 
especially with more example photos. Then also ensuring the tags are 
well supported in each editor's presets.

Cheers

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