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additional material for a talk on GTFS Pathways & GTFS-RT PathwayUpdates
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_notes.md

GTFS Pathways

  • als pathways.txt Teil der GTFS-Schedule/Static-Spezifikation -> statische Daten
  • bildet alle Umsteigebeziehungen in einer Station (Hub) als Graph ab
    • Knoten sind Eingänge/Bahnsteige/etc.
    • Kanten sind Wege/Fahrtreppen/Aufzüge/etc.
    • Achtung: der Graph muss vollständig sein –> wenn Wege fehlen, werden diese von konsumierender Software als nicht existierend angenommen
  • existierende Feeds
    • curl 'https://storage.googleapis.com/storage/v1/b/mdb-csv/o/sources.csv?alt=media' -fsSL | qsv search -s features '\bpathways\b' | qsv select location.country_code,location.subdivision_name,provider,name
    • DE (im DELFI-GTFS): VBB (~500), MVV (~200), SSB/NVBW (~200), HVV (~130), ansonsten vereinzelt
    • EU: Paris, Budapest, Prag (nicht überprüft)
    • USA: San Diego (MTS), San Francisco (WETA), Boston (MBTA), Maryland
    • CA: Alberta
  • Werkzeuge
    • Routing: OpenTripPlanner – MOTIS noch nicht
    • Visualisierung/Umwandlung: bisher nur sehr rudimentäre Werkzeuge, z.b. extract-gtfs-pathways
    • generisch: Graph-Tools & -Datenbanken –> Query "alle Eingänge, die über Aufzüge von X aus erreichbar sind"

Praxis

  • erster Anhaltspunkt: wc -l {stops,pathways}.txt
    • Boston: 9987 stops.txt, 8070 pathways.txt
    • VBB: 527027 stops.txt, 294105 pathways.txt
    • Paris: 53357 stops.txt, 4992 pathways.txt
  • danach manuelle Analyse im Detail
  • praktisch wäre ein Tool, das die Verknüpfung mit dem OSM-Graphen überprüft -> OTP nutzen?

Beispiel: DELFI/VBB Berlin Pankow-Heinersdorf (de:11000:900130001)

[screenshots 1-5]

ground truth: https://commons.wikimedia.org/wiki/Category:Bahnhof_Berlin-Pankow-Heinersdorf

Beispiel: Boston Green Street (place-grnst)

[screenshots 1]

Beispiel: Paris Sèvres-Babylone (IDFM:71203)

[screenshots 1-4]

Beispiel: Budapest Népliget (CSF01282)

[screenshots 1-5]

GTFS-PathwayUpdates

GTFS Pathways:

While the core specification of GTFS-Pathways has been completely integrated into GTFS, additional information such as text-to-speech instructions, wheelchair assistance information, equipment-failure reporting, planned or scheduled entrance or exit closures, and elevator and escalator outages need to be added.

  • deswegen GTFS-PathwayUpdates
  • Erweiterungsvorschlag für GTFS-Realtime (GTFS-RT)
  • Idee: statisch spezifizierte Pathways dynamisch ändern/"löschen"/ergänzen -> überlagert die statischen Pathways-Daten
  • fügt dem FeedEntity-Element neue (optionale) Kindelemente StationUpdates hinzu
  • Achtung: "If there is no StationUpdate for a pathway listed in pathways.txt, it means there is no real-time status available. It does not mean that the pathway can be used."
  • PathwayStatus: UNKNOWN/OPERATIONAL/OPERATIONAL_WITH_LIMITATIONS/NOT_RUNNING
  • PathwayDirection: UNCHANGED/FORWARD/BIDIRECTIONAL/BACKWARD
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mbta-place-grnst.pw.geo.json
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,{"type":"Feature","properties":{"pathway_id":"grnst-030","pathway_mode":1,"is_bidirectional":false,"length":67.6656,"signposted_as":"Exit to street","line-color":"#2c3e50","line-width":0.7,"stroke-opacity":0.3,"stroke-width":2},"geometry":{"type":"LineString","coordinates":[[-71.108059,42.309832],[-71.107743,42.310317]]}}
]}
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