Fig. 4. (a) Traffic Data Infrastructure, Courtesy of OSC; (b) Electricity Data Infrastructure. The visualizations presented in this paper were performed on an affordable gaming gear, such as Dell Alienware Aurora R7 desktop gaming-PC, with an Intel i7 Processor and an NVIDIA RTX1080 card equipped with a 3D-mouse for navigation. 44 Case Studies Many data sources curated by local, national, and international providers can be gathered and visualized. Table 2 summarizes the types of smart city data accessible in the framework, and analyzes their relevance for smart cities, their IEEE Instrumentation & Measurement Magazine October 2021