[Talk-transit] Public transport validator+generator from Maps.Me

Alexey Zakharenkov eulenspiegel at list.ru
Thu May 30 17:29:08 UTC 2019

Hello, all readers of «PT validator+generator from Maps.Me» thread!

Thank you, I’ve not excepted to get so encouraging feedback in so short time. For some reason I haven’t got each reply to my mailbox, but I’ve got them in a «Talk-transit Digest». So let me answer here to all questions.

1) "Have you checked whatever some of validation rules can be included in the JOSM validator?"

No, I haven’t. I’ll try to find time to check, but unlikely shortly.

2) "Can you expand it to modes besides subway?"

The validator has two notional modes: underground (subway + light_rail + monorail + train considered to be rapid transport) and overground (bus, tram, trolleybus, … ). We run validator with ‘underground' option on a predefined list of rapid transit networks, which has a form of google-table document, link to which is given in repo’s readme. The results you can see at http://osm-subway.maps.me <http://osm-subway.maps.me/> . At present we do not process overground transport in our application, but the google doc has an ‘Overground’ sheet with some cities.

3) "should  http://osmz.ru/subways/ <http://osmz.ru/subways/> be considered obsolete?»

We run subway validation on a daily basis. If one would have monitored the subway state for some time, it would become evident that it changes every day, unfortunately towards degradation if let it go (regarding correctness, not fullness). Week-old validation results can be considered as outdated (some cities remain stable for months though). So, Ilya Zverev’s page is definitely obsolete. BTW, each generated validation HTML page has timestamp at the bottom.

4) "what are Maps.me <http://maps.me/>'s recommendations for subway tagging?»

The author of the preprocessor, Ilya Zverev, wrote such recommendations at https://wiki.openstreetmap.org/wiki/Metro_Mapping <https://wiki.openstreetmap.org/wiki/Metro_Mapping> . They are not the ultimate truth, and the validator is actually more flexible and resistant to different mapping techniques as long as the mapped things allow to obtain consistent and unambiguous transport data snapshot. Anyways, the recommendations along with the tool have a conclusive strong side: they proved their effectiveness for production purposes at world-wide scale.

5) "For Belgium, I am missing the Charleroi lightrail …»

The google doc is open for commenting and it is permanently improving! Please leave your suggestions to rapid transit network list in comments to appropriate cells, or to free cells underneath if a new network is suggested.

6) "Should an "Entrance" be used at aboveground stations?»

Surely, entrances increase map accuracy and help navigation. Subway infrastructure may be fully or partially located on the ground (level=0) or even overground (level>0).

7) "I have not tested this but think that your preprocessor requires a 
"station" node. However, I don't see this necessity in PT v_2.»

@Tijmen  The preprocessor requires «station» object in its broad sense: railway=station/halt, highway=bus_stop/tram_stop. All other elements (platforms, stop_positions, entrances) are optional, but not a station.

@Jason  I’ve raised Paris metro and Paris RER from ruins in two weeks. I estimate New York Subway to be in not much more worse state. Efforts of already involved mappers are not sufficient to quickly put all subways in order.

Best regards,

> 29 мая 2019 г., в 22:44, Tijmen Stam <mailinglists at iivq.net> написал(а):
> On 29-05-19 17:35, Alexey Zakharenkov via Talk-transit wrote:
>> Hello everybody!
>> I'm a part of team who worries about public transport status in OSM database, especially rapid transit transport. I want to represent a public transport validator+generator that somebody might find a useful facility. It's open source:
>> https://github.com/mapsme/subways
>> Given a list of transport networks it generates output suitable not only for rendering PT routes but also for routing. Meanwhile it finds errors like gaps in rail/road sequence in a route, absent/doubling station at a stop, etc. We run the validator daily and publish the results at
>> http://osm-subway.maps.me
>> The page shows that even large and important subway systems (like New York Subway) in OSM DB are currently corrupted and therefore unusable for practical purposes. Difficulties occur not only due to negligent mapping but also due to misalignment how to map PT. I call you, who is interested in PT, to use this instrument, evaluate it and give feedback. We're ready to improve this tool for the community sake and take into account worthwhile suggestions.
>> Thank you for your attention.
>> I'm ready to answer any questions.
> Thank you, very useful!
> I have not tested this but think that your preprocessor requires a "station" node. However, I don't see this necessity in PT v_2.
> For Belgium, I am missing the Charleroi lightrail (Metro Leger) system (and possibly Antwerps "premetro" system, but that is a mixture of tram and subway.
> For Austria, I am missing the Dorfbahn Serfaus system.
> Then a question about Rotterdam: Should an "Entrance" be used at aboveground stations? E.g. Maassluis west (converted from train station / to be opened:
> https://www.google.nl/maps/place/Maassluis/@51.9262933,4.2356667,214m
> Where should the entrance be placed?

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