piebro/osm-data huggingface dataset:
hsc666 (2020-05-23 08:46:28+00:00): Nicht so ganz. Eine Beschränkung auf bestimmte Verkehrsmittel gilt auf einer bestimmten Strecke. Du müsstest Dir also den Teil des Weges nehmen, der betroffen ist (falls es das Wegstück noch nicht einzeln gibt, müsstest Du ein vorhandenes auftrennen) und mit den entsprechenden Eigenschaften versehen. Ein gutes Hilfsmittel hierfür ist das Verkehrszeichen-Tool: <http://osmtools.de/traffic_signs/>, das zeigt Dir sehr einfach, welche Eigenschaften eingetragen werden müssen. Die Eigenschaften an diesem Knoten hier können dann wieder weg.

BTW: Falls Du es noch nicht kennst: <https://wiki.openstreetmap.org/wiki/File:Osm-tutorial.pdf>.
UW Maddie (2020-09-02 08:49:54+00:00): removed objects from unauthorized source (bing bird's eye)
Cebderby (2020-05-25 18:51:31+00:00): terrible alignment - Esri imagery is clearly not well aligned here and you need to deal with this whenever you edit
geogajes (2020-07-13 07:42:54+00:00): Dag Seat Ibiza, graag even overleg over het pad tussen de Sussenweg en de Cannerweg. Dit pad loopt door tot de Cannerweg, al is dat op een luchtfoto misschien niet te zien. Het loopt tussen twee huizen door die zo dicht bij elkaar staan dat de daken elkaar bijna raken. Ik stel voor om de verbinding met de Cannerweg weer te herstellen. mee eens? groet, Geert
skfd (2020-05-25 06:49:29+00:00): Привет! классно мапишь! Я только хотел посоветовать, что в украине принято номера домов делать слитно с цифрой и прописными --- 33а, не 33-А 😊
Alenium (2020-05-25 08:34:13+00:00): Привіт. Дякую! Виправлю. Але нажаль маленька буква "б" читається як "6"  - що з цим робити?
skfd (2020-05-25 08:46:47+00:00): Нажаль да, почему-то у нас решили маленькими хотя в других странах -- боьлшими. 
лично страдаю от етого :( Жил в доме 51б, такси не раз пытались приехать в пятцотшестандцатий дом...
ovruni (2020-05-22 18:35:29+00:00): Hola
Para realizar una importación por favor seguir las directrices de OSM[0] para que sus contribuciones no sean retiradas en el futuro. De la misma forma utilizar el validador de JOSM para no generar errores en el mapa por edificios duplicados o superpuestos. Para cualquier consulta sobre como editar puedes hacerla por el canal de telegram o la lista de correos de la comunidad de OSM en Perú https://wiki.openstreetmap.org/wiki/ES:Per%C3%BA#Comunidad 
Saludos
[0] https://wiki.openstreetmap.org/wiki/ES:Importaci%C3%B3n/Directrices
eggie (2020-05-22 16:42:34+00:00): Welkom bij OpenStreetMap. Ik heb een uitgebreid welkomstbericht met wat handige tips en links gestuurd als privébericht.
MVG,
Eggie
wille (2020-05-22 13:01:50+00:00): Oi, João. Nessa edição você não precisa dar nome à quadra e pode desenhar a área dela em vez de usar um ponto.
            ---
            
            Published using OSMCha: https://osmcha.org/changesets/85597644
berndw (2020-05-23 07:36:33+00:00): Hallo

bitte keine beschreibenden Namen und nir so als Hinweis, bitte klebe keine Wege an Flächen an und stell Deinen Hintergrund auf ESRI um

;-)
Bernd
user_5359 (2020-05-22 19:04:57+00:00): Hello! Please notice:
* you have a typo aera instead area
* you didn't the key area, if you use the key landuse also
hsc666 (2020-05-23 07:27:42+00:00): Hallo Fred Fruchtig,

Ich habe Deine persönliche Nachricht erhalten, werde aber nur hier darauf eingehen. 

OSM ist kein Spiel und Du hast Dinge eingetragen, die so in der Realität nicht vorhanden sind, nur um Dir Vorteile in Pokémon Go zu verschaffen. Das betrachten wir als Vandalismus und gehen dagegen vor. Dabei spielt es auch keine Rolle, wie groß die Parks sind, die Du erfindest. Du schadest mit Deinem Handeln dem Ansehen von OSM und minderst die Datenqualität. Menschen verlassen sich auf die Richtigkeit der Daten in OSM!

Dass Du mit diesem und den folgenden Changesets nach dem Revert der vorangegangenen Änderungen erneut erfundene Dinge eingetragen hast, halte ich für den Augenblick für ein Versehen und nicht Böswilligkeit. Dennoch werde ich den Großteil der Änderungen erneut zurücksetzen müssen. Einträge die glaubhaft sind oder glaubhaft gemacht werden können, werde ich natürlich nicht entfernen. Allerdings werde ich mir diese Mühe kein drittes Mal machen.

Wenn Du weiterhin versuchst, Dinge einzutragen, die so nicht der Realität entsprechen, um insb. Vorteile in Pokémon Go zu erzielen, werden wir Dein Benutzerkonto sperren. Wenn Du Dich ernsthaft mit OSM beschäftigen möchtest, bist Du herzlich eingeladen. Einen guten Einstieg findest Du z.B. hier: <https://wiki.openstreetmap.org/wiki/File:Osm-tutorial.pdf>.

Wenn Du Fragen hast, melde Dich bitte hier im Kommentar des Changesets (<https://www.openstreetmap.org/changeset/85599161>) oder im Forum.

VG
hsc666
hsc666 (2020-05-23 15:52:32+00:00): Revert der beiden Pokemon-Parks, der Rest scheint ok.
SHARCRASH (2020-12-31 20:36:33+00:00): Bonjour! C'est normal ce chemin de croix en plein milieu de la rivière? https://www.openstreetmap.org/node/7547713797
Sept Carto (2020-12-31 21:06:41+00:00): Bonjour 
Non bien sûr.  C'est une erreur même difficile d imaginer comment elle s'est produite !!!
Merci pour votre vigilance !
SHARCRASH (2021-01-01 15:48:00+00:00): On ne sait jamais pour l'existence d'une croix en faveur d'une bénédiction, un miracle local, demander protection... où le tag était juste mal choisi au lieu de man_made=cross. Dommage, je trouvais cela romantique. Meilleurs voeux pour cette nouvelle année!
Carto'Cité (2020-06-04 11:32:50+00:00): Salut Eric,
Autour du rond point tu as ajouté des pistes cyclables : https://www.openstreetmap.org/way/807123721
Sur la photo aérienne et sur les photos Mapillary de juillet 2019 on voit qu'il s'agit de bandes (https://www.openstreetmap.org/way/807123721). Est-ce qu'elles ont été transformées en pistes récemment ? Tu as laissé la description des bandes cyclables à ce sujet donc il y a un doublon. Dis moi si quelque chose a changé et on corrigera ensemble si tu veux :)
Charles de Carto’Cité pour #CartoVeloIdF
Eric V (2020-06-04 15:19:16+00:00): Salut Charles

Non je vais les supprimer. C'est bien une erreur, je n'avais pas vu le tag pour les bandes et je ne suis pas très au fait des choses du vélo. 
Merci et bonne journée
Carto'Cité (2020-06-04 15:21:26+00:00): Super ! Merci pour ton retour :)
Je te laisse corriger mais si tu as la moindre question n'hésite pas ;)
À bientôt.
Charles
skfd (2020-05-25 06:52:39+00:00): Привет! Если ето входы в подъезд, то можно уточнено указать entrance=staircase )
aceman444 (2021-04-22 21:30:15+00:00): Zdravim. V OSM nie je povolene zadavat na objekty opisne nazvy ako "zadrziavacia nadrz". Takyto typ objektu treba vyjadrit prislusnymi znackami. Ak to nie je mozne, alebo neviete ako, treba tento opis zadat do znacky 'fixme'. Urobim to tak, kedze neviem co znamena 'zadrziavacia nadrz'. Nie je to nahodou poziarna nadrz, kedze hned vedla je hasicska zbrojnica? Dakujem
aceman444 (2021-04-22 21:32:14+00:00): Do znacky 'name' ide len vlastne meno objektu, ak existuje. Keby na nej bolo napisane napr. "Nadrz sv. Floriana" alebo nieco podobne.
Lokai (2023-11-08 20:15:42+00:00): Hallo,

hier ist ein Knoten eines Fliessgwässers mit einer Brücke verbunden.
Das kann passieren. Ich nehme das zum Anlass, weil du in großen Umfang Wege, Fliessgeässer und Grenzen mit Flächen verbindest. Bei OSM wird das als u.a. als verkleben bezeichnet. Eine spätere Änderung ist dann umständlich und bereitet viel Aufwand. Kannst du dir vorstellen von dieser Technik weniger Gebrauch zu machen? Gibt es für dich einen besonderen Grund dies überhaupt zu tun?

Gruß
L.
mavl (2020-05-22 15:29:29+00:00): Здравствуйте. Спасибо за уточнение карты.  
Этот пакет правок добавляет дорогу с названием "Разворотное кольцо автобусного маршрута №11 у школы". Это не название с точки зрения OpenStreetMap. Такую информацию рекомендуется помещать в тег description.  
  
https://wiki.openstreetmap.org/wiki/RU:%D0%9D%D0%B0%D0%B7%D0%B2%D0%B0%D0%BD%D0%B8%D1%8F  
  
https://wiki.openstreetmap.org/wiki/RU:Key:name  
  
https://wiki.openstreetmap.org/wiki/RU:Key:description
TobolOSM (2020-05-23 15:20:48+00:00): Спасибо! Перенёс в description.
mavl (2020-05-24 11:49:08+00:00): Спасибо.
aceman444 (2021-04-25 16:08:42+00:00): Zdravim, v tejto sade zmien ste nezmenili ziadny nazov, takze popis "uprava nazvov" asi nebude spravny. Prosim davajte na to pozor.
A parkovaci dom na https://www.openstreetmap.org/way/304291080 asi nebude mat kapacitu len jedno miesto, ako ste uviedli.
hsc666 (2020-05-23 15:51:50+00:00): Ich finde weder auf Mapillary noch sonst irgendwo einen Hinweis darauf, dass diese Wege hier "Kurparkpromenade" heißen sollen. Wenn Du einen Nachweis über die Benennung vor Ort erbringen kannst (z.B. geo-kodiertes Foto der Beschilderungen o.ä.) kann der Name drin bleiben, ansonsten werde ich das wieder zurücksetzen.
hsc666 (2020-05-23 16:58:04+00:00): Revert Pokemon-Park
Øukasz (2020-05-22 10:39:21+00:00): Shouldn't be cycleway=lane?

https://wiki.openstreetmap.org/wiki/Key:cycleway
MFlamm (2020-05-22 10:56:35+00:00): Well, it depends which section you are talking about. As a matter of fact, the new cycle lanes/tracks in most places have taken over the full width of a car lane, are separated by a continuous yellow line and on several places authorities have placed temporary cycleway signs (blue bicycle signs). For all those reasons, cycleway=track seems more appropriate to me. Do you see road sections where my coding choices seem inappropriate?
Øukasz (2020-05-22 11:15:49+00:00): Thanks for the fast response :)

I think on Boulevard Georges-Favon, going north, starting between Rue Hornung and Rue Bovy-Lysberg (where there is the small road block) all the way until the end of Pont de la Coulouvrenière the situation is as you describe - a new dedicated bike lane. That's as far as I know from my commute, so can't speak of other areas. 

My point is that based on the wiki: 

"A cycle track is separated from the road by curbs, parking lots, grass verges, trees or another physical barrier, but is running parallel to and next to the road."

"A cycle lane is bicycle infrastructure that is an inherent part of the road, but set aside for the exclusive use of bicycles, whilst being separated only by paint or other markings"

My limited French makes me think this wiki entry also supports this: https://wiki.openstreetmap.org/wiki/FR:Key:cycleway

I think the description of the "lane" here more closely matches what we see in reality.
MFlamm (2020-05-22 13:07:44+00:00): Hello again,
I understand your point and won't contradict you that the present tag definitions in the wiki are on your side. This being said: cycleway tags should reflect the actual value of usage for cyclists and I strongly believe that the new bike lanes are as valuables as cycle tracks... Don't you think so?
So, if you agree with me on that, the debate you are raising rather points out the need to adapt the wiki in all languages to take account of the recent move by multiple cities to create temporary cycling infrastructures in reaction to the Covid crisis. 
For your information: I take care of bicycle related tags in Geneva since several years and my current efforts are directed at optimizing bicycle navigation systems like Geovelo (as well as bicycle maps like CyclOSM). 
I will get in touch with specialized mappers in other countries in order to adapt the wikis. So, please, do not change cycleway tags on your own meanwhile, because you would degrade the quality of the cycling tools mentioned above. If you see any local tagging problem, do not hesitate to get in touch with me and I will take care of corrections.
Thanks, Michael
PS. I have visited all the new cycling facilities with a panoramic camera on my helmet, but went there during low trafic conditions. If your own commute experience differs from my perception, I would be glad to read your point of view (then by direct mail instead of this changeset discussion, I guess)
Øukasz (2020-05-22 15:14:23+00:00): Noted on all points - and thank you for alerting me to geovelo and cyclosm tools, I will check them out!

On your point "cycleway tags should reflect the actual value of usage for cyclists and I strongly believe that the new bike lanes are as valuables as cycle tracks... Don't you think so?" I actually think the wiki description is quite unambiguous as it refers to physical aspects rather than infrastructure's purpose or usage, but I accept there may be finer considerations I am not aware of. 

I only raised the comment on this changeset in the first place because you were half an hour faster than me in mapping these new lanes (or, as you prefer, tracks) :)

I will refrain from making any edits and wait to see what your revision on the wiki results in. I would appreciate if you could make a note of this here, so I know when there is some conclusion.

Thanks a lot!
Øukasz (2020-07-23 08:51:51+00:00): Hello again,

I was wondering if there was any conclusion to your discussions with the specialised cycle mappers?

Thank you
hsc666 (2020-05-23 17:03:23+00:00): Erbringe bitte einen Nachweis, für das angeblich hier befindliche Monument! 

Hinweis aus dem Wiki <https://wiki.openstreetmap.org/wiki/DE:Tag:historic=monument>: "Mit diesem Attribut wird ein besonders großes Objekt beschrieben, welches erbaut wurde um an eine Person oder ein geschichtliches Ereignis zu erinnern. Ein Monument erinnert zum Beispiel an politische oder militärische Anführer / Religionsführer. Ein Monument unterscheidet sich von einem Denkmal dadurch, dass es begehbar ist."

Ansonsten werde ich auch diese Änderung zurücksetzen.
mapperue (2020-06-26 20:14:18+00:00): Zdravim, po tejto zmene je v okoli Kovalovskych luk prerusena zelena turisticka trasa.
https://www.openstreetmap.org/relation/572169
Je v skutocnosti zelena znacka zrusena a cesta neexistuje?
Patr1k_P (2020-06-26 20:38:36+00:00): zdravim,ta cesta bola zakreslena,ze vedie az dole a napaja sa na tu spodnu cestu (vid foto)...ale neni davno som tadial siel a mal som pocit ze tadial sa neda prejst...v skutocnosti tam ani cesta nebola,len luka...tak som to zrusil..tou zelenou si isty nie som
https://imgur.com/a/6tRVyRL
mapperue (2020-06-27 07:02:49+00:00): Pri vytvarani novych ciest treba upravit aj relacie (turisticke, cyklistické a ine trasy), ktore po nich vedu. Po jednej uprave cesty su prerusene 3 turisticke trasy, 1 cyklisticka trasa a 1 trasa pre kone.
https://imgur.com/a/iJihV0G

Tiez je potreba useky ciest s rovnakymi tagmi, hodnotami a relaciami spajat do jednej cesty. V tomto pripade su 3 useky rozdelene:
https://imgur.com/a/haHCNxU
V editore ID sa cesty spajaju oznacenim jedneho useku, nasledne shift + oznacenie ostatnych usekov + C.
Patr1k_P (2020-06-27 07:16:35+00:00): viem o tom,ze to je nedorobene,ale nevedel som ako sa tie relacie robia..tak sory...tie odkazy co si postol nefunguju..
Patr1k_P (2020-06-27 07:32:45+00:00): a tam jak som mazal cestu a zostalo tam na konci ze je zelena,ako sa to da dat prec? pripadne ako spravim z nejakej cesty zelenu + zltu alebo len zltu? toto treba robit uz v jave?
mapperue (2020-06-27 08:02:38+00:00): Tieto odkazy by mali byt v poriadku:

prerusenie tras
https://ibb.co/Q6rySpT
Vsimol som si, ze uz na tom pracujes a teraz to vyzera byt v poriadku.

3 useky, ktore by mali byt spojene do jednej suvislej cesty
https://ibb.co/7vmwqc7
mapperue (2020-06-27 08:21:07+00:00): Ci sa na useku cesty nachadza relacia (vedie po nej turisticka, cyklisticka alebo ina trasa) je vidiet po oznaceni cesty na lavom paneli v casti Relations. Po prejdeni kurzorom na konkretnu trasu na lavom paneli sa tato trasa vysvieti modrou a je vidiet, ktore casti tato trasa zahrna. Na tomto obrazku je vidiet, ktore useky ciest zahrna zelena turisticka trasa 5115.
https://ibb.co/KyxhFKP

Pridat usek cesty do relacie (trasy) sa da cez ikonu zase v casti Relations na lavom paneli a ikonou +. V rozbalovacom zozname je moznost vybrat najblizsie relacie v okoli (zobrazuju sa len relacie v najblizsom okoli a niekedy je potrebny refresh stranky ak sa v zozname nezobrazuje potrebna relacia).
https://ibb.co/r7wsHNm

Naopak odobratie useku cesty z trasy sa robi cez ikonu kosa v casti Relations na lavom paneli.
 https://ibb.co/wd11rZK
Patr1k_P (2020-06-27 08:33:52+00:00): dobre,ale kde to je zadane ze ta cesta ma znacku zelena...co ak potrebujem namiesto zelenej dat zltu? alebo aby bola aj zlta aj zelena
mapperue (2020-06-27 09:24:44+00:00): V lavom paneli v casti Relations sa pri ceste zobrazuju len cislo trasy alebo nazov trasy (ak trasa nema cislo ani nazov, tak sa zobrauje jej cislo ID, ktore ma kazda trasa v osm).

Turisticke a cyklisticke trasy a ich cisla a farby zobrazuje v ID podkladova mapa Freemap.sk (aktualizuje sa vsak po niekolkych dnoch, takze nove zmeny nie su vzdy vidiet). Prepinat sa medzi mapami v ID da takto:
https://ibb.co/ThVsGmY

Vidiet, aku ma trasa farbu, nazov a ine informacie sa da na lavom paneli po kliknuti na konkretnu trasu.

Ak po ceste vedie zelena znacka a ma tam byt len zlta, tak sa v lavom paneli klikne na ikonu kosa pri zelenej znacke a cez tlacidlo + sa prida zlta znacka.
Ak po ceste vedie aj zelena aj zlta znacka, tak sa cez tlacidlo + pridaju obidve znacky na jeden usek cesty.
Patr1k_P (2020-06-27 09:54:16+00:00): fajn a ako upravit len cast cesty, ked vzdy to vysvieti aj pridruzene k tomu dalsie cesty? chcel by som napr. upravit len toto

https://ibb.co/X51PnNq


....a niekde to nezobrazuje farbu...kukni napr. sem

https://www.freemap.sk/?map=17/48.847017/17.323422&layers=X&tool=map-details

...je tam zlta aj modra a ked to rozkliknem,tak nezobrazuje ziadnu farbu
Patr1k_P (2020-06-27 10:02:24+00:00): uz viem asi,ale je to inak znacene...je tam osmc symbol a ja som hladal polozku colour...ak by som chcel upravit len cast cesty, musel by som asi upravit samotnu cestu odstranenim uzla,skratka aby mi blikala len cesta ktoru chcem upravit...predpokladam ze lahsie to nejde
mapperue (2020-06-27 10:35:14+00:00): V Cesku su trasy znacene trochu inak ako na Slovensku.

Neviem, ktoru cast myslis, ale nasiel som v okoli prerusenu modru trasu HO709 a ten usek sa doplni tak, ze sa rozdeli cesta pri rozcesti a na chybajuci usek (vyznaceny modrou) sa doplni modra trasa HO709.
https://ibb.co/7YDcxNv
Patr1k_P (2020-06-27 11:06:33+00:00): nevadi, uz viem co som potreboval,hodne si mi pohomol...ty upravujes len v id alebo pouzivas aj josm? id mi pride pre zaciatocnikov jednoduchsi...
Patr1k_P (2020-06-27 11:10:32+00:00): tuto som myslel,ze neni standardne klucom colour ako som si myslel

https://www.freemap.sk/?map=17/48.847198/17.322489&layers=X&tool=draw-lines&line=48.848169/17.323304%2C48.847823/17.322832%2C48.847421/17.322457%2C48.846976/17.322156%2C48.846475/17.321995
mapperue (2020-06-27 13:30:34+00:00): Na jednoduche upravy pouzivam ID. Josm ma viac funkcii, ale ak ich nevyuzivas, tak staci ID.
Niektore najma cyklisticke trasy su rozdelene na viac casti a vtedy sa pouzivaju tzv. superroute relacie a tie sa daju upravovat len v Josm.

Pri uprave tras tiez pouzivam tento web:
https://hiking.waymarkedtrails.org/#routelist?map=15!48.8464!17.3292
Daju sa tam zobrazit vsetky trasy v osm (turisticke, cyklo, mtb, inline, pre kone a lyziarske) a mat lepsi prehlad, co sa nachadza v okoli. Po uprave v osm treba pockat niekolko hodin az sa zmena na webe zobrazi.

Na Slovensku sa pouziva pre oznacenie farby trasy tag colour a v Cesku kct_farba
Patr1k_P (2020-06-28 08:22:48+00:00): no zatial sa zaobidem bez josm...a clovek v tom musi aj vediet trochu robit..vdak za pomoc
Frans S (2020-06-30 10:14:19+00:00): Hello. Thanks for mapping here.
A remark. 
Please square all buildings (rectangular) with the Q key in the editor
Most buildings are good rectangular and the mappings should reflect that.
A hand drawn building is mostly not correct squared. Therefore use the Q key after calling it a building and the object is still selected. 
Be aware that this will not work when the deviation to a square corner is to big. Then you have to adjust the building manually . After that you can square it again.

Another issue is the collecting of multiple buildings and map them as 1 building. This is not the correct way to map buildings.
Please map each building individually and be aware to not include the shadow of that building in your mapping.

Never let a node of a building connect to other features, like highways, other buildings  or residential areas
Let highways never cross buildings as well. 
Navigation systems cannot handle these situations

Please pay also attention on the issue triangle on the right-hand menu
It alerts you on warnings and errors.
Please (try to)solve these before uploading your work.

Best regards
Frans S (2020-06-30 17:20:30+00:00): Hello.  
First of all, thank you so much for mapping on this project
Why this message? A team of validators review mappings to check if the mappings are according to the instructions and are free of errors, 
## In general, your mappings are a bit below the quality standard HOTOSM stands for.
Your mappings are rather inaccurate, not squared and incomplete





* An advice, please map as accurate as possible, with corners, porches etc. Zoom in as close as possible. 



We hope that this information is helpful to improve the quality of your mappings.

Thank you for helping the Humanitarian OpenStreetMap Team (HOT).

Frans S

*****HINTS & TIPS *****
* Sometimes, the project the TM manager imagery is very vague and bad to map from.
 Use another Imagery like Maxar P imagery. 

It is the most recent and shows more details where you can map from. Align it with the TM imagery (correct offset) and map all objects you can see. Then switch back to the TM Imagery and map the rest (mostly newer build or expanded buildings).
* Don't cluster a group of buildings by making it 1 building
* Always square your building (use the Q key in ID editor) except round huts and curved walls of course
* Don't connect buildings with nodes to highways (which is an error, roads do not go through buildings). 
* Avoid connecting nodes of buildings to each other. (They mostly do not share walls).

* If you are new to HOTOSM, this webpage is worth reading
https://www.openstreetmap.org/user/bgirardot/diary/36235
For the Tanzania projects these are very helpful as well

Please see here for new mapping instructions   
https://drive.google.com/open?id=1bS_TVHPFHKKVBSdjx3RRQdxhdWrMJ3wdEh_BSnsL4hI                   

 https://drive.google.com/open?id=1N1rXlAyGcJ6VJ2p3qbD4PRsuo65o3pC5yHB2wq1TGEc
siwilde | GSuite Presentation 

* Searching for and identifying of buildings is sometimes difficult. When you are mapping, switch on and off OSM data layer (shortcut ‘W’”) and zoom in and out as far as possible (Check which Image you can use) so you are sure not to overlook buildings, (often partly hidden under trees)

* Please take a look to these pages.

http://learnosm.org/en/hot-tips/tracing-rectangular-buildings/

https://learnosm.org/en/hot-tips/

* Check the Offset of the image you use. See instructions on TM3 to see how to do that

* If necessary, try to zoom in further. When you see white spots on your image, zoom out till the object are visible as well, or try another image. When working in JOSM, switch off the automatic zoom. (Right mouse button, check auto zoom off)

* When mapping buildings partly hidden by trees do not follow the outlines of a tree but extrapolate the building picture.  Often there is a shadow on the ground near a building. Don' include these in your mapping.
*Communicate with HOTOSM
HOTOSM has a workspace and communication channel on SLACK
When you are interested, please ask for an invitation at SLACK HOTOSM
http://slack.hotosm.org