Hi On Sat, 29 Sep 2018 at 00:29, Michael Booth <boot...@gmail.com> wrote: > > 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 fail to understand the difference between a man_made=communications_tower and man_made=tower + tower:type=communication. Aren't all towers far visible landmarks? When is a tower huge? The wiki page also says that 'another indication is, that a man_made=communications_tower has stairs and a lift inside, whereas as man_made=tower, tower:type=communication has to be climbed on the outside.' However this is contradictory with the definition of man_made=tower: 'a tower is accessible and provides platforms, whereas a mast only offers ladder steps to climb it.' It might be better to discourage man_made=communications_tower and tag them man_made=tower + tower:type=communication + height=*. > 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. I'm not an expert on this, but i think the distinction steps/lift inside (= tower) vs latter outside (= mast) makes sense. > 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 I would have tagged them the same. > 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 Why aren't 2, 3, 5, 6 and 8 masts and 4 and 7 towers? Because the structure itself is an antenna? By the way, i'm wondering if poles with mounted antennas like in the following image can also be called masts or if man_made=pole (undocumented, but 2 047 uses so far) would be better? https://wiki.openstreetmap.org/wiki/File:Mobilfunkmasten_auf_Wohnhaus_Gotzingerplatz_Muenchen.JPG Regards Markus _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
