piebro/osm-data huggingface dataset:
freebeer (2018-03-04 04:04:49+00:00): Hallo cgthigpen,
From an earlier look I took at the aerial imagery, it seems to me as an outsider that the details 5359 added to the outline are correct (going from memory) and are the level of mapping detail I like to think I try to strive for with good aerial imagery sources, a lot of time on my hands, and a quest for detail.
When I compare the shadows from the various imageries, it looks to me that the areas which could be cut out as courtyards  may not actually reach ground level (you mentioned levels 2 to 5), but rather the shadows are shorter, cast by additional building parts atop the base.
This would be better represented by a 3d model atop of the outline, if my memory of the imageries is correct.
.
As a long-suffering victim of the Potlatch 2 editor, I agree it can be somewhat better to use for mapping without making many mistakes that the beginner editor iD may lead one into.  However, there probably is not as much support out there in an easy-to-find way that can guide one to advanced editing and tricks on how to get the best out of Potlatch.  It seems a reasonable compromise, despite its detractors, between a user-friendly-but-limited/more-powerful beginner editor, and the more-advanced yet probably with-steep-learning-curve editor JOSM.
The latter editor is probably overkill if you only want to make a handful of edits here and there, yet feel constrained by iD or if your editing sessions do things you did not want.  It is the ultimate goal should you become addicted to mapping and wish to continue (I keep telling myself I can stop whenever I feel like it.  I just don't feel like it, honest, guv)
.
I've never done 3D mapping but I'm pretty sure you need to understand it in detail before Potlatch, with limited tagging presets, can be used as a power tool.
.
The best thing is to understand all the details  of what and how you want to map, then it's less a question  of which tool but how you use it.
A poor craftsman blames his tools, which is why I persist with Potlatch and its whipping-boy history, rather than exposing to the world that I am, in fact, a lousy mapper scattering blame on awful imageries, my miserable editor, lack of sleep, and everyone else's incompetence but my own.
Oh, by the way, if I recall, there are much better imageries like that from Mapbox available that show far more detail and more clearly, while your changeset refers to the Bing default.
Hope this unrelated commentary is useful.  Otherwise apologies for wasting your time.
Gh0stz0x (2018-02-22 13:29:37+00:00): Hola Rodríguez, tu conjunto de cambios es muy extraño. ¡Te estaré vigilando! 😉
...y si encuentro algo mal, hago una buena reversión de lo que hiciste. ok?

Hello Rodriguez, your changeset is very strange. I'll keep an eye on! 😉
...and if I find something wrong I do a nice revert of what you did. ok?
Hjart (2018-02-20 19:40:40+00:00): Er du sikker på at det giver nogen mening at bruge denomination på de her kirkegårde?
Niels Elgaard Larsen (2018-02-21 08:54:54+00:00): Wikien siger:
You can add religion=* and denomination=* tags for more information.
Hjart (2018-02-21 09:50:50+00:00): Et er hvad wikien siger, noget andet er om det giver mening at tilføje denomination til almindelige danske kirkegårde. Behøver man nødvendigvis at være lutheraner for at kunne bruge dem? Jeg mener de fleste af os definerer os jo bare som kristne (i et eller andet omfang)
Niels Elgaard Larsen (2018-02-21 11:17:00+00:00): Nej. Man behøver ikke at være lutheraner.
Men man behøver heller ikke at være kristen.
Dette gælder for folkekirkens kirkegårde, som er næsten alle i Danmark. De  fleste døde fra ikke-kristene religioner, bliver begravet på folkekirkens kirkegårde.

Brødremenighedens kirkegård er et af de få eksempler på en kristen kirkegård uden for folkekirken. Og denomination, giver nogen mening for der er forskelle: grave sløjfes ikke, de døde vender i en bestemt retning, osv.

I Danmark ville det give mere mening at tagge kirker og kirkegårde, som "folkekirken", men jeg ved ikke helt hvordan man skulle gøre det.

For fx, udlændinge, der bare vil vide hvad det er for en kirkegård, de kommer forbi og ikke kender til folkekirken, synes jeg, at denomination giver mening.
Hjart (2018-02-21 12:17:45+00:00): Alle "Folkekirker" i DK er tagget med denomination. Folk der evt er interesserede i et fingerpeg angående tilhørende kirkegårde kan jo bare se på kirken
Constable (2018-02-21 10:22:49+00:00): Hi there, welcome to OSM!
Please make sure you add proper changeset comments to your edits.
https://wiki.openstreetmap.org/wiki/Good_changeset_comments
Thanks!
sergeybe (2018-02-21 04:26:04+00:00): Пожалуйста прекратите плодить дубли. Вы только ухудшаете данные карты.
user_5359 (2018-02-20 21:18:55+00:00): Welcome to OSM! Note that in OSM description of the objects has the highest priority. Objects that have only one name, have little sense. As home page for the question "How do I describe you?" I recommend the web site http://wiki.openstreetmap.org.
But I found https://www.openstreetmap.org/note/1305798
and add this information
GinaroZ (2018-02-20 20:16:51+00:00): Hi, what's your source for the voltage for these power lines?
Russ (2018-02-20 20:43:32+00:00): The short answer is it's an educated guess. Once you have an eye for it, it's relatively easy to pick out from aerial imagery the main distribution lines which run between substations. In most of Britain (including all of Scotland), these are 33kV.

I've written some more detail on how to spot this stuff on the wiki: https://wiki.openstreetmap.org/wiki/WikiProject_Power_networks/Great_Britain
GinaroZ (2018-02-20 23:10:19+00:00): Thanks
adrianojbr (2018-02-20 23:21:35+00:00): carlos, você alterou em massa várias borracharias para uma etiqueta depreciada (https://wiki.openstreetmap.org/wiki/Tag:amenity%3Dcar_repair).

ainda, cabe uma discussão se a melhor etiqueta para borracharia é:
1. shop=car_repair + repair=tyres 
2. shop=car_repair + service=tyres
3. shop=tyres + repair=yes

pela wiki (https://wiki.openstreetmap.org/wiki/Tag:shop%3Dcar_repair) a opção 2 é melhor que a 1. no entanto, a comunidade brasileira tende a adotar a opção 3, como mostra a wiki em português (https://wiki.openstreetmap.org/wiki/Pt:Tag:shop%3Dtyres), essa página de referência para tradução (https://wiki.openstreetmap.org/wiki/WikiProject_Brazil/Refer%C3%AAncia) e orientação no telegram (https://t.me/OSMBrasil_Suporte/20977 + https://t.me/OSMBrasil_Suporte/20978). ok?
Carlos Brys (2018-02-21 09:22:01+00:00): Adriano.
Gracias por la sugerencia.
LO discutí en el grupo de Telegram y voy a revertir los cambios.
Tenemos una diferencia de criterios entre Brasil y Argentina respecto al las gomerías (borracharia).
En Ar lo vemos más como un taller para neumáticos, mientras que en Br lo consideran una tienda, aunque no vendan nada.
letihu (2018-03-20 11:21:51+00:00): Dieses 
https://www.openstreetmap.org/way/350360181/history#map=14/48.9138/9.5080&layers=N
Gebiet beinhaltet auch dieses
https://www.openstreetmap.org/way/350360179/history
Gebiet, mit unterschiedlichen "name", "is_in" und  "place".
Stimmt das so?
eggie (2018-02-20 21:19:25+00:00): Dag Mysco. Ik heb junction=roundabout toegevoegd.  Oneway=no heb ik verwijderd. Helaas is het zo dat je de busroutes hebt onderbroken. Die zijn nu verdwenen. Ik zal even kijken of het makkelijk te herstellen is. Met editor iD kan dat niet.

Veder stuur ik je alsnog een welkomstmail om je in te lezen hoe mappen in OSM Nederland gaat.
eggie (2018-02-20 21:48:39+00:00): Ik heb een poging gedaan om de routes op een simpele manier te herstellen. 
Ik zal nog even vragen of de ervaren OV mappers nog even willen kijken.
eggie (2018-02-20 21:54:16+00:00): Het probleem staat op het forum
https://forum.openstreetmap.org/viewtopic.php?pid=685945#p685945
eggie (2018-02-20 22:24:41+00:00): Via PB contact gehad..
eggie (2018-02-21 08:26:45+00:00): Het klopt weer.
highflyer74 (2018-02-21 09:07:59+00:00): Hello!

Can you please check this POI, as addr:street=LKW Wash is not correct...

Thank you!
highflyer74 (2018-02-21 09:09:58+00:00): Also please use proper changeset comments when uploading a change. See https://wiki.openstreetmap.org/wiki/Good_changeset_comments for more info on that. Thank you!
eggie (2018-02-20 20:49:08+00:00): Oke.. helaas.. weer zo'n regel. Geen adressen op gebouwen zetten. Die zitten al op de adresnode. 
Het commentaar heb je kunnen aanpassen zie ik.
eggie (2018-02-20 20:54:06+00:00): Haal je het adres er weer af?
eggie (2018-02-20 22:32:16+00:00): reneus... Het duplicate adres heb ik verwijderd van het gebouw.
Reneus (2018-02-21 06:42:42+00:00): Ok. Het is wel een redelijke inleertijd... Twee databases met adressen. De web client laat gegevens uit database A zien (leeg), suggereert dat er ingevuld moet worden, terwijl er eigenlijk een andere adres database B is. De webclient zou eigenlijk gegevens uit database B moeten laten zien.
eggie (2018-02-21 08:01:25+00:00): Dat komt doordat de kaart van Nederland uniek is. We importeren los van de gebouwen de adresnodes van het Kadaster. Voorheen tagde ik ook gewoon op de gebouwen. In landen waar geen import is zou je dat ook kunnen doen.
GinaroZ (2018-02-20 22:23:57+00:00): Hi, you seem to have deleted this building and added a new one which does not appear on any aerial imagery. Is this the correct situation on the ground?
Ross Nicol (2018-02-20 22:28:09+00:00): Hi, yes the aerial imagery is out of date. The two buildings currently marked B&M & Lidl have been demolished and a new building is on site which is Lidl. Google maps have the correct aerial imagery at https://www.google.co.uk/maps/place/Farmfoods+Ltd/@56.1140926,-3.9292951,212m/data=!3m1!1e3!4m5!3m4!1s0x0:0xb4924529c5ad99d9!8m2!3d56.1143876!4d-3.9273816

Hope that helps?
Pieter Vander Vennet (2018-02-23 22:45:26+00:00): Hey, bedankt om dit missende pad toe te voegen!

Vergeet echter niet om de uiteindes mooi vast te maken aan de andere paden. Op die manier weet routeringssoftware dat je deze doorsteek ook echt kunt gebruiken. (Ik heb het al gedaan voor je, dus voor deze weg hoef je het niet meer te doen)
eglatorre (2018-05-14 12:02:45+00:00): moi,
vaihdoin nimi Päiväkoti -> Paikkatietokeskus
Rakennus on itseasiassa nimen oman Paikkatietokeskus.

Jos sen yhteydessä on päiväkoti, niin laita se esim pisteenä erikseen
user_5359 (2018-02-21 05:23:56+00:00): Welcome to OSM! Short question to https://www.openstreetmap.org/way/469065583 ? A street with 5 lanes and all lanes are oneway=reversible?
abakus_uploader (2018-02-20 23:33:06+00:00): (Wiadomość automatyczna)
Cześć!
Otrzymujesz ten komentarz, ponieważ dodałeś lub zmodyfikowałeś adres, który jest niepełny lub błędny.
Adres powinien zawierać minimum trzy znaczniki: addr:city=[nazwa_miejscowosci] + addr:street=[nazwa_ulicy] + addr:housenumber=[numer_porządkowy].
Wyjątkiem są miejscowości bez nazwanych ulic - wtedy stosujemy znaczniki: addr:place=[nazwa_miejscowosci] + addr:housenumber=[numer_porządkowy].
Bez poprawnego oznaczenia adresów, nie będą one brane pod uwagę przez wyszukiwarki, dlatego warto je dostosować do ww. schematu (w zależności od sytuacji).
Więcej informacji na forum: https://forum.openstreetmap.org/viewtopic.php?id=5632 - a pytania najlepiej zadawać tu: https://forum.openstreetmap.org/viewtopic.php?pid=681873
Pozdrawiamy!
HubMiner (2018-03-12 06:30:11+00:00): Hello, there are now 2 overlapping forest preserves with same name.  The other one is https://www.openstreetmap.org/way/174852044 and it seems to match county map.  Could you check if "name" and "leisure" tag could be removed from one you updated:  "https://www.openstreetmap.org/way/197308839" ?
shogun (2018-02-21 06:15:53+00:00): kurze Frage, wo ist da ein getrennter Radweg an der B175. ist der neu gebaut worden?
muaum (2018-02-22 19:42:49+00:00): Hallo shogun, ja, der Radweg ist neu. Dumm nur, dass ich mir vor Ort den weiteren Verlauf in Richtung Westen nicht gemerkt habe. Deswegen lasse ich ihn auch noch vor dem Kreuz mit der S51 auslaufen, obwohl das sicher anders aussieht. Komme auch leider nicht so schnell wieder vorbei. Grüße, muaum
eggie (2018-02-21 08:14:51+00:00): Dag Gerard.. 
Het adres komt nu 2x voor. Dat geeft verwarring. Je kunt de school ook op de adresnode taggen. Dat adres moet dus van het gebouw af. Adressen horen op de adresnodes en die is er al. 
Verdere tips om aan te passen.
amenity=school is basisschool en VO
amenity=college  is AOC en ROC .. dus MBO
amenity=university is 
HBO en universiteit
 
Bij scholen wordt wel vaak de naam op het gebouw gezet, maar niet nog een keer hetadres.
Pas je het zelf aan?
Graag reactie

amenity=school gebruiken
eggie (2018-02-21 08:15:53+00:00): Die laatste regel hoort er niet bij... 
Hier dus waarschijnlijk amenity=universiy
SomeoneElse_Revert (2018-04-28 23:29:57+00:00): This changeset has been reverted fully or in part by changesets 58510954, 58506260, 58507519, 58514650, 58514174, 58505701, 58509392, 58500784, 58512130, 58515035, 58510461, 58506875, 58508734, 58513728, 58513212, 58511524, 58502701, 58504854, 58509968, 58508131, 58512688 where the changeset comment is: Reverting recent unedited changes by Bonya_23, see http://resultmaps.neis-one.org/osm-discussion-comments?uid=4355762 and https://www.openstreetmap.org/user/Bonya_23/blocks for laundry list of issues; no communication.
juminet (2018-02-22 19:44:26+00:00): Bonjour Gauvin, 

Est-ce que le nom du parc cartographié ici https://www.openstreetmap.org/way/562891282 n'est pas CRIE plutôt que CRIER. En plus, je pense que le CRIE d'Anlier a changé de nom: c'est maintenant Nature Attitude. 

Happy mapping, 
juminet
SHARCRASH (2018-05-26 16:58:55+00:00): Hello juminet! :) Est-ce que tu sais si cette zone est vraiment un parc https://www.openstreetmap.org/way/562891289 Gauvain Servais l'a t'agé en tant que tel et j'ai un énorme doute, je dirait plutôt que ce sont des espaces résidentiels privés. C'est un risque de désinformation/violation de propriété privée. Je lui ai fait note aussi d'autres erreurs (voir ses edits).
juminet (2018-05-28 06:49:32+00:00): Salut, effectivement, je dirai que ce ce sont des jardins privés, quasi sûr. Peut-être que c'est devenu un parc pour jouer à PokemonGO ;-) ? Mais Gauvin a fait de bons ajouts précédemment, donc, laissons-le d'abord corriger cette erreur lui-même.
SHARCRASH (2018-05-28 09:27:29+00:00): Parc à Pokemon GO... HAHAH
SHARCRASH (2018-02-26 15:23:30+00:00): Ceci n'est certainement pas un parc. https://www.openstreetmap.org/way/562892782
RicoElectrico (2018-02-21 13:04:10+00:00): Cześć. Dzięki za dodanie sklepu. Z tym, że godziny otwarcia nie piszemy w nazwie, tylko dodajemy osobno. W maps.me masz od tego pole przy dodawaniu POI.
SHARCRASH (2018-02-26 15:21:44+00:00): Bonjour! Veuillez respecter le consensus des tags établi par la communauté des contributeurs que vous pouvez retrouver dans le Wiki d'OSM. Un élément est taggé selon sa représentation la plus proche à la réalité. Par exemple vous avez défini cette zone https://www.openstreetmap.org/way/431538355 comme un parc alors qu'il y a des terrains sportifs à l'intérieur. Donc, le plus proche serait de le tagger comme landuse=recreation_ground et s'il n'y avait pas de terrain de jeu pour enfants leisure=sports_centre. Ce ne sont pas des parcs comme le Parc Gaspar ou Parc Léopold. Attention aussi sur la précision. Merci de votre comprehension!
SomeoneElse_Revert (2018-04-28 23:30:59+00:00): This changeset has been reverted fully or in part by changesets 58510954, 58506260, 58507519, 58514650, 58514174, 58505701, 58509392, 58500784, 58512130, 58515035, 58510461, 58506875, 58508734, 58513728, 58513212, 58511524, 58502701, 58504854, 58509968, 58508131, 58512688 where the changeset comment is: Reverting recent unedited changes by Bonya_23, see http://resultmaps.neis-one.org/osm-discussion-comments?uid=4355762 and https://www.openstreetmap.org/user/Bonya_23/blocks for laundry list of issues; no communication.
SomeoneElse_Revert (2018-04-28 23:30:19+00:00): This changeset has been reverted fully or in part by changesets 58510954, 58506260, 58507519, 58514650, 58514174, 58505701, 58509392, 58500784, 58512130, 58515035, 58510461, 58506875, 58508734, 58513728, 58513212, 58511524, 58502701, 58504854, 58509968, 58508131, 58512688 where the changeset comment is: Reverting recent unedited changes by Bonya_23, see http://resultmaps.neis-one.org/osm-discussion-comments?uid=4355762 and https://www.openstreetmap.org/user/Bonya_23/blocks for laundry list of issues; no communication.
SomeoneElse_Revert (2018-04-28 23:29:33+00:00): This changeset has been reverted fully or in part by changesets 58510954, 58506260, 58507519, 58514650, 58514174, 58505701, 58509392, 58500784, 58512130, 58515035, 58510461, 58506875, 58508734, 58513728, 58513212, 58511524, 58502701, 58504854, 58509968, 58508131, 58512688 where the changeset comment is: Reverting recent unedited changes by Bonya_23, see http://resultmaps.neis-one.org/osm-discussion-comments?uid=4355762 and https://www.openstreetmap.org/user/Bonya_23/blocks for laundry list of issues; no communication.
SomeoneElse_Revert (2018-04-28 23:28:44+00:00): This changeset has been reverted fully or in part by changesets 58510954, 58506260, 58507519, 58514650, 58514174, 58505701, 58509392, 58500784, 58512130, 58515035, 58510461, 58506875, 58508734, 58513728, 58513212, 58511524, 58502701, 58504854, 58509968, 58508131, 58512688 where the changeset comment is: Reverting recent unedited changes by Bonya_23, see http://resultmaps.neis-one.org/osm-discussion-comments?uid=4355762 and https://www.openstreetmap.org/user/Bonya_23/blocks for laundry list of issues; no communication.
US Woods (2018-10-18 13:05:47+00:00): You haven caused several holes in relations by this edit. This should be impossible if you would follow the instructions of JOSM. Please be more careful!
SomeoneElse_Revert (2018-04-28 23:21:33+00:00): This changeset has been reverted fully or in part by changesets 58510954, 58506260, 58507519, 58514650, 58514174, 58505701, 58509392, 58500784, 58512130, 58515035, 58510461, 58506875, 58508734, 58513728, 58513212, 58511524, 58502701, 58504854, 58509968, 58508131, 58512688 where the changeset comment is: Reverting recent unedited changes by Bonya_23, see http://resultmaps.neis-one.org/osm-discussion-comments?uid=4355762 and https://www.openstreetmap.org/user/Bonya_23/blocks for laundry list of issues; no communication.
SomeoneElse_Revert (2018-04-28 23:30:58+00:00): This changeset has been reverted fully or in part by changesets 58510954, 58506260, 58507519, 58514650, 58514174, 58505701, 58509392, 58500784, 58512130, 58515035, 58510461, 58506875, 58508734, 58513728, 58513212, 58511524, 58502701, 58504854, 58509968, 58508131, 58512688 where the changeset comment is: Reverting recent unedited changes by Bonya_23, see http://resultmaps.neis-one.org/osm-discussion-comments?uid=4355762 and https://www.openstreetmap.org/user/Bonya_23/blocks for laundry list of issues; no communication.
SomeoneElse_Revert (2018-04-28 23:23:21+00:00): This changeset has been reverted fully or in part by changesets 58510954, 58506260, 58507519, 58514650, 58514174, 58505701, 58509392, 58500784, 58512130, 58515035, 58510461, 58506875, 58508734, 58513728, 58513212, 58511524, 58502701, 58504854, 58509968, 58508131, 58512688 where the changeset comment is: Reverting recent unedited changes by Bonya_23, see http://resultmaps.neis-one.org/osm-discussion-comments?uid=4355762 and https://www.openstreetmap.org/user/Bonya_23/blocks for laundry list of issues; no communication.
viloan (2018-02-20 22:40:45+00:00): Bem-vindo(a) ao OpenStreetMap e parabéns pela sua primeira edição! :-)

Se você está mapeando por causa do Pokémon, dê uma olhada em https://blog.openstreetmap.org/2017/12/01/dicas-para-novos-mapeadores-pokemon-go/?lang=pt-pt

Também temos um portal brasileiro sobre o OpenStreetMap, com várias informações úteis em https://wiki.openstreetmap.org/wiki/Brasil

Enquanto você está se acostumando com o OpenStreetMap, é recomendado que sempre pergunte aos usuários mais experientes antes de remover ou modificar objetos do mapa, especialmente aqueles que são aparentemente "estranhos" ou "fora do lugar".

Além disso, pedimos que não copie dados de mapas proprietários (como nomes de ruas do Google Maps, por exemplo) e que mapeie apenas o que existe na realidade.

Se tiver qualquer tipo de dúvida você pode entrar em contato com a comunidade brasileira através de algum dos canais disponíveis em https://wiki.openstreetmap.org/wiki/Pt:Contact
O canal "Comunidade" do Telegram costuma ser o mais movimentado.

Abraço e boa diversão com suas edições!
Hjart (2018-02-20 23:12:03+00:00): Det er altid en god ide at angive https://wiki.openstreetmap.org/wiki/Key:shelter_type.
Ellers er det ikke til at vide om der er tale om en https://wiki.openstreetmap.org/wiki/Tag:shelter_type%3Dpublic_transport eller en https://wiki.openstreetmap.org/wiki/Tag:shelter_type%3Dlean_to
4004 (2018-02-24 23:11:47+00:00): о, значит он еще там? спасибо!
Syl (2022-06-25 08:41:58+00:00): Bonjour, je ne suis pas arrivé à trouver la plaque en cherchant dans le hall de la gare. Où se trouvait-elle ?
Syl (2022-11-15 16:03:41+00:00): Je viens à nouveau de chercher et je ne l'ai pas trouvé. Je viens de la supprimer d'OSM.
BAK365 (2018-02-21 12:49:32+00:00): Hallo, deine Quellenangabe überrascht mich etwas. IGN BdOrtho? Im Glarnerland?
Beste Grüsse, BAK365
InfosReseaux (2018-02-21 13:10:32+00:00): Hello,
Oups, this was a mistake. IGM BdOrtho is a French national database I use to use there. I didn't updated the source field in JOSM last night.
Source is local knowledge and ESRI imagery in JOSM.
I'm no sure I can update the changeset
All the Best !
BAK365 (2018-02-21 16:36:46+00:00): Thank you for your reply. I know IGN, thus my surprise to see it as a source for edits in Linthal/Glarus. I am also surprised how detailled your edits are, especially the underground parts like pipelines, valves, generators etc. (examples https://www.openstreetmap.org/node/5425649966#map=19/46.87639/8.98567&layers=D, https://www.openstreetmap.org/way/562902651#map=19/46.87641/8.98541&layers=D, https://www.openstreetmap.org/node/5425649117#map=19/46.84839/9.01164&layers=D). What are your sources here? Could you please specify that a bit more detailled. I would like to make sure we are not using unauthorized material here.
Best regards.
BAK365
InfosReseaux (2018-02-21 17:06:54+00:00): Yes I'm really keen on power plant mapping and manage to find precise public documentation.
For the cavern of Lint-Limmern and Linthal 2015, there is plenty of documentation available on the web/youtube/whatever
https://www.swisslinkpersonal.ch/images/gal/G40215915302.jpg
http://c.tutti.ch/images/kraftwerk-linth-limmern-1962-glarus-seilbahn-3119671243.jpg
InfosReseaux (2018-02-21 17:09:29+00:00): This is precise mapping but not exact mapping. All nodes are added by hand on JOSM according to charts and explanatory texts. For example, I know the Linthal 2015 cavern is 150m long x 54m height then I just draw a rectangle at the approximative location but without any certitude.
BAK365 (2018-02-21 18:23:15+00:00): Hmmm, I'm not sure I'm glad I asked....  
I trust you are aware that information publicly available on the internet might not be usable in OSM due to its copyright situation. I leave it to you to check the copyright status of the sources you used (youtube, swisslinkpersonal.ch, tutti.ch).
Best regards.
BAK365
InfosReseaux (2018-02-21 22:25:39+00:00): I agree the docs I linked may be compyrighted, but information on them certainly not.
To build such infrastructure, public institutions have to give an agreement based on projet files which are freely available and displayed to citizens. As Switzerland is a very welcoming country, open days are often organized and it's possible to come inside the caverns (like done in Veytaux, VD last year https://twitter.com/InfosReseaux/status/863386777884778496 https://www.openstreetmap.org/way/493901521). I didn't even try to reproduce the drawings, but to study, gather and produce my own interpretation which differ a bit from documents found like we do directly on ground.