Presentation for my Insight Project, SaFeRack (saferack.space)

1. Mason Jiang, Insight DS 2016A

2. THE PROBLEM SaFe
Rack
Finding parking for your bike in
San Francisco
Proximity Safety

3. THE SOLUTION
www.saferack.space
SaFe
Rack

4. HOW IS THIS DONE?
Destination
Max Walking
Distance
Bike Safety
vs.
Proximity
PreferenceArrival Time
USER
INPUTS
SaFe
Rack

5. Destination
Arrival Time
USER
INPUTS
5 PM
SaFe
Rack
HOW IS THIS DONE?

6. Destination
Arrival Time
USER
INPUTS
10,282
bike theft
incidents
(2003 − 2015)
5 PM
SaFe
Rack
HOW IS THIS DONE?

7. Destination
Arrival Time
USER
INPUTS
5 PM
Kernel Density
Estimation (KDE),
weighted by recency
of crime
P (X,Y)
SaFe
Rack
HOW IS THIS DONE?

8. Destination
Max Walking
Distance
Arrival Time
USER
INPUTS
5 PM
P (X,Y) 1,842
bike racks
citywide
Local Risk Score
(1 to 100)
SaFe
Rack
HOW IS THIS DONE?

9. Destination
Max Walking
Distance
Bike Safety
vs.
Proximity
PreferenceArrival Time
USER
INPUTS
5 PM
P (X,Y)
Rack recommended
from weighted
average
safety proximity
SaFe
Rack
HOW IS THIS DONE?

10. safety proximity
SaFe
Rack
ACHIEVING A BALANCE

11. ACHIEVING A BALANCE
safety proximity
SaFe
Rack
Testing on 100 SF addresses…
SAFEST
RACK
Avg. Distance
0.36 miles
Avg. Risk Score
34 / 100
CLOSEST
RACK
Avg. Distance
0.03 miles
Avg. Risk Score
68 / 100
50% drop in risk score,
but with 0.33 miles
extra walking

12. ACHIEVING A BALANCE
safety proximity
SaFe
Rack
Testing on 100 SF addresses…
SAFEST
RACK
Avg. Distance
0.36 miles
Avg. Risk Score
34 / 100
CLOSEST
RACK
Avg. Distance
0.03 miles
Avg. Risk Score
68 / 100
CHOSEN
RACK
Avg. Distance
0.22 miles
Avg. Risk Score
39 / 100
43% drop in risk score
with only 0.19 miles
extra walking
50% drop in risk score,
but with 0.33 miles
extra walking

13. KDE Map (2003 to 2005)
SHIFTS IN BIKE CRIME
Marina, Russian Hill,
Fisherman’s Wharf
Tenderloin /
SOMA
Districts
✧ Regions of dense bike theft activity shift over the years
SaFe
Rack

14. KDE Map (2013 to 2015)
Mission
District
✧ Regions of dense bike theft activity shift over the years
SaFe
Rack
Tenderloin /
SOMA
Districts
SHIFTS IN BIKE CRIME

15. KDE Map (2013 to 2015)
Mission
District
✧ Regions of dense bike theft activity shift over the years
SaFe
Rack
Tenderloin /
SOMA
Districts
SHIFTS IN BIKE CRIME

16. MASON JIANG
Ph.D. in Physics, Stanford University
B.S. in Applied Physics, Columbia University
LCLS X-ray Laser (SLAC National Accelerator Laboratory, Menlo Park, CA)
Half Dome
Basketball

17. ✧ Number of bike theft incidents reported varies with time of day
SaFe
Rack
EXTRA GRAPHS
(Arrival Time)

18. SaFe
Rack
EXTRA GRAPHS
(Arrival Time)

19. EXTRA GRAPHS
(Bike Crime KDE vs. Bike Rack KDE) SaFe
Rack

20. SaFe
Rack
EXTRA GRAPHS
(Bike Crime KDE vs. Bike Rack KDE)

21. SaFe
Rack
EXTRA GRAPHS
(Bike Crime KDE vs. Bike Rack KDE)
Bike Crime KDE Bike Rack KDE
399 Golden Gate Ave, San Francisco, CA 94102

22. SaFe
Rack
EXTRA GRAPHS
(Bike Crime KDE vs. Bike Rack KDE)
Bike Crime KDE Bike Rack KDE
865 Market St, San Francisco, CA 94103

23. SaFe
Rack
EXTRA GRAPHS
(Bike Crime KDE vs. Bike Rack KDE)
Bike Crime KDE Bike Rack KDE
547 Haight St, San Francisco, CA 94117

24. EXTRA GRAPHS
(Transformation of KDE values) SaFe
Rack

25. EXTRA GRAPHS
(Transformation of KDE values) SaFe
Rack

26. EXTRA GRAPHS
(Bandwidth Selection) SaFe
Rack

27. saferack.space (front page)

28. saferack.space (output)

29. saferack.space (chosen rack)

30. saferack.space (other racks)

31. saferack.space (crimes)

32. CHOSEN RACK
SaFe
Rack

33. CHOSEN RACK
SaFe
Rack

34. CHOSEN RACK
SaFe
Rack