  Understanding crowd mobility behaviors would be a key enabler for crowd
management in smart cities, benefiting various sectors such as public safety,
tourism and transportation. This article discusses the existing challenges and
the recent advances to overcome them and allow sharing information across
stakeholders of crowd management through Internet of Things (IoT) technologies.
The article proposes the usage of the new federated interoperable semantic IoT
platform (FIESTA-IoT), which is considered as "a system of systems". The
platform can support various IoT applications for crowd management in smart
cities. In particular, the article discusses two integrated IoT systems for
crowd mobility: 1) Crowd Mobility Analytics System, 2) Crowd Counting and
Location System (from the SmartSantander testbed). Pilot studies are conducted
in Gold Coast, Australia and Santander, Spain to fulfill various requirements
such as providing online and offline crowd mobility analyses with various
sensors in different regions. The analyses provided by these systems are shared
across applications in order to provide insights and support crowd management
in smart city environments.
