[Tagging] mast / tower / communication_tower (again)

[Andrew Harvey]

The rule of thumb I've been using is a mast being a simple pole (same
width at base and top), and a tower being anything else that has more
supports.

I do think we need something simple to distinguish simple mobile phone
towers like (1) and larger television/radio broadcast towers like (2)
and it seems like mast/tower is it.

(1) https://www.mapillary.com/app/?focus=photo&lat=-33.93286508330576&lng=151.18355422222226&z=17&pKey=LDefrZ_M7MJDsLuLEdJgbw&x=0.7464902074345785&y=0.45923282717222375&zoom=1.4281437125748506

(2) https://www.mapillary.com/app/?focus=photo&lat=-33.82031388888889&lng=151.18473611108334&z=17&pKey=9HZD5c2vDjDBTmz-LwKuCA&x=0.6698933374381035&y=0.29396379693325986&zoom=0
On Sat, 29 Sep 2018 at 08:29, Michael Booth <boothym at gmail.com> wrote:
>
> 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.
>
> https://binged.it/2xILZO9
> https://www.geograph.org.uk/photo/2361955
> https://www.geograph.org.uk/photo/2337468
> https://en.wikipedia.org/wiki/Charwelton_BT_Tower
> https://www.geograph.org.uk/photo/2053885
> https://binged.it/2xTxcQK
> https://fr.wikipedia.org/wiki/Tour_hertzienne_de_Villeneuve-d%27Ascq
> 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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