Tracking ExplorationsLicia Amichi, Aline Carneiro Viana, Mark Crovella and Antonio Alfredo Ferreira Loureiro

Key words: Mobility, Prediction, Predictability, Regularity, Time periodicity

Strategy

Conclusion and Future Work References

What is an exploration?

Motivation

A visit to a new place

What is a return?A visit a known place

We decompose human movements into two basic types of movements - return R and exploration E We then study the behaviour of individuals when visiting new places (E) and when visiting known places (R) by capturing:

- Stability in R - Stability in (E) - Regularity in transitions between (R) and

(E) - Regularity in transitions between (E) and

(R)

DatasetData GPS locationsCities More than 6

countriesNb users 55 usersPeriod 1055 daysSampling 5 min

rg =1N ∑

i∈L

ni (ri − rcm)2

d( ⃗x ) = ( ⃗x − ⃗u )T S−1 ( ⃗x − ⃗u )

• So far, we can observe three groups of individuals: extremely explorers, extremely returners and mid-explorer mid-returner

• Next, we want to extract common features within the resulting groups• Associate to each individual an adaptative factor that can tell given her

current context whether she is more likely to make an exploration or a return

[1] A.  Cuttone, S.  Lehmann and M.C.  González Understanding, predictability and exploration in human mobility, EPJ Data Science 2018 [2] Limits of Predictability in Human Mobility, C. Song, Z. Qu, N. Blumm and A.-L. Barabási, Science 2010

Preliminary Results

above 90%under 68%

Why?

SR

SE

TR

TE