att_abstract={{This paper illustrates how aggregated mobile phone network activity logs
provide anonymous information that reveals valuable insight into the presence of
tourists visiting a city. Technologies supporting pervasive services like cellular
networks have the potential to generate vast quantities of detailed subscriber data,
raising important privacy concerns. But they also provide to researchers and city
planners an unprecedented opportunity to understand the presence and movement
of physical communities. We demonstrate how aggregated communication records
offer the opportunity to note where people are transmitting and receiving information.
The emergence of these spatial imprints obtained through novel technological means
has a significant potential to support urban studies and particularly the optimization of
tourism strategies, plans and marketing tools. In this study, we examine the use of
locally and non-locally registered mobile phones in the vicinity of the �Waterfalls�
public exhibit in New York City in 2008. We study aggregated statistics (i.e. number
of calls) related to the network sectors covering the exhibit and its proximity. With the
future contribution of traditional survey techniques, such as field counts, to calibrate
these mobile phone network measurements, we aim to develop techniques to
estimate the aggregate movements and location of visitors through time and space,
while assuring their privacy.}},
	att_tags={mobility, tourism, location, cdr},
	author={Fabien Girardin and Andrea Vaccari and Alexandre Gerber and Assaf Biderman and Carlo Ratti},
	institution={{International Conference on Computers in Urban Planning and Urban Management (CUPUM)}},
	title={{Towards Estimating the Presence of Visitors from the Aggregate Mobile Phone Network Activity they Generate}},