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a
b
BRONX
CITY
QUEENS
INNER LONDON
BROOKLYN
STATEN
ISLAND
OUTER LONDON
10 km
10 km
c
NEW
TERRITORIES
KOWLOON
LANTAU
ISLANDS
H
O
N
G KONG
I
SLAND
10 km
Fig. 15.1
Administrative maps of
(
a
) Greater London, (
b
)NewYork,and(
c
) Hong Kong
Table 15.1
Background information on the scale of the studied cities
Area (km
2
)
Density (pop/km
2
)
City
Population
Greater London
1,572
8,200,000
5,206
New York
1,214
8,350,000
6,865
Hong Kong
1,104
7,000,000
6,405
Source: wikipedia, 2013
Despite their apparent differences (in terms of history, culture, or weather conditions
to name only the obvious ones) and geographical distances, one can expect emerging
similarities between these cities due to globalization. They are therefore perfect
candidates for tracking universal communication patterns.
15.2.2
Data Gathering and Preprocessing
Our analysis is based on aggregate 3G mobile traffic data (including all kinds of
devices like phones, tablets, etc.) supplied by several operators, and corresponding
to a statistically significant part of the total 3G mobile traffic of the covered areas,
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