IEEE Elec trific ation Magazine / J U N E 201 8 75 Electricity Electricity Sensor/Actuator Electricity Data Water, Gas, and Oil Water, Gas, and Oil Sensor/Actuator Water, Gas, and Oil Data Human-Activity Data Transportation Transportation Sensor/Actuator Human Activity Human-Activity Sensor/Actuator Communication and IT Networks Transportation Data Figure 1. Multistream data sources in the era of smart cities. IT: information technology. Physical Layer Cyberlayer Intradomain Applications Interdomain Applications Multidiscipline Data-Driven Applications for Smart Cities Security Security Sensor/Actuator Security Data Other ...... Others Sensor/Actuator Other Data