Presentation held at Webtuesday, on May,12 2009 http://webtuesday.ch/meetings/20090512 Covers what is behind the scenes of local.ch’s 1st of April joke http://blog.local.ch/archive/2009/04/02/tram-local-ch-april-scherz.html

1. Zürich trams LIVE
Behind the scenes of
local.ch’s 1st of April joke
Vasile Cotovanu

2. Are they really live ?
GPS, sensor on tracks, live XML feed from SBB/ZVV ?

3. How we did it ?
• Build vector “database”
• Build textual “database”
• Integrate vector and text and make them
usable by map.local.ch
• Other use-cases of a public transport full
dump

4. Build vector - Google Earth

5. Vector: How accurate ?

6. Vector: How accurate ?

7. Vector: How accurate ?

8. Vector: simplified but ...

9. Vector: end loops

10. Vector: preserve one-ways

11. Vector: final KML

12. Vector: Clean it !

13. Vector: topology errors

14. Vector: snap stations

15. Vector: graph done !

16. Text: vehicle-link-station
station vehicle
link
station_id vehicle_id
name many-many name
vehicle_id
station_id
departure

17. Text: populate link, vehicle
vehicle
vehicle_id
name
link
many-many
vehicle_id
station_id
departure

18. Text: how it looks like

19. Integrate vector + text

20. Integrate vector + text
Tram 4
264,-445,-261,-259,-257,-255,
-253,-540,-539,-250,-274,-276,
-278,-277,-464,-463,-555,-50,
-460,-459,-194,-193,-191,-188,
-190,-189,-184,-183,-181,-180,
-179,-118,-120,-122,-437,123

21. Export to map.local.ch

22. Make them move !
map.local.ch vehicle
simpleservice
JS

23. Make them move !
map.local.ch vehicle
simpleservice
JS
Vehicle Tram2
A S1 S2 S3 B
13:10 13:14 13:22 13:30 13:35

24. Make them move !
map.local.ch vehicle
simpleservice
JS
Vehicle Tram2
13:26
A S1 S2 S3 B
13:10 13:14 13:22 13:30 13:35

25. Make them move !
map.local.ch vehicle
simpleservice
JS
Vehicle Tram2
13:26
A S1 S2 S3 B
13:10 13:14 13:22 13:30 13:35
74%

26. Make them move !
map.local.ch vehicle
simpleservice
JS
Vehicle Tram2
13:26
A S1 S2 S3 B
13:10 13:14 13:22 13:30 13:35
74%
55%

27. Make them move !
map.local.ch vehicle
simpleservice
JS
Vehicle Tram2
13:26
A S1 S2 S3 B
13:10 13:14 13:22 13:30 13:35
74%
55%
Polylines S2 - S3
S3
S2

28. Make them move !
map.local.ch vehicle
simpleservice
JS
Vehicle Tram2
13:26
A S1 S2 S3 B
13:10 13:14 13:22 13:30 13:35
74%
55%
Polylines S2 - S3
S3
S2

29. Make them move !
map.local.ch vehicle
simpleservice
JS
Vehicle Tram2
13:26
A S1 S2 S3 B
13:10 13:14 13:22 13:30 13:35
74%
55%
Polylines S2 - S3
S3
S2

30. Additional features
Wow, they know how many passengers are inside !

31. What else ?
“boring” widgets with departures

32. Meet in the middle

33. Thank you !