2015 D-STOP Symposium session by D-STOP Researcher Todd Humphreys. Watch the presentation at http://youtu.be/sSotvhKg3Wc?list=PLWQCGQLl10mwkino_uNmTO4JXOg5oCWtU
Get symposium details: http://ctr.utexas.edu/research/d-stop/education/annual-symposium/
Vehicle Tracking with Fine-Grained GPS and Implications for Safety
1. Vehicle Tracking with Fine-Grained GPS
and Implications for Safety
Todd Humphreys, UT Austin
D-STOP Symposium | March 2, 2015
2. Cell-Resolution Mobility Traces
Montjoye et al., “Unique in the Crowd: Privacy Bounds of Human Mobility” Nature, 2013
• 93% predictable (theoretical limit) (Song et al., 2010)
• highly unique: with only 4 random spatio-
temporal points (1-hour time res.), 95% of traces
can be identified (Montjoye et al., 2013)
At cell-level granularity, mobility traces are ...
3. Eagle and Pentland, “Eigenbehaviors: identifying structure in routine,” Behav Ecol Sociobiol, 2009
Behavior from Cell-Resolution Mobility Traces
Eigenbehavior analysis allows discovery of behaviors that are correlated
across large gaps in time (e.g., I came in early so I can leave early and go to a
show tonight).
10. Zang and Bolot, “Anonymization of location data does not work” MobiCom, 2011
The value of mobility traces goes as
their information content
From 25 million cell users across U.S. Sprint network ...
11. Cell-level: What are your
daily patterns?
City-level: Where do you live?
Coarse GPS/WiFi-level:
What is your approximate context?
Decimeter-level:
What is your immediate present reality?
12. Why we may want our vehicles to know
their position at sub-decimeter accuracy:
• safety and security for connected veh.
• more efficient traffic flow
• personal assistant; forecasting
• proof of location
18. Cell-level: What are your
daily patterns?
City-level: Where do you live?
Coarse GPS/WiFi-level:
What is your approximate context?
Decimeter-level:
What is your immediate present reality?