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The draft definitions of an urban Digital Twin by the IEC (International Electrotechnical Commission) Smart Cities Systems Committee is :
digital representations of a city made up of large quantities of geo-located and other data, often including real time data, which enable better city planning and management.
Note 1: The geo-located data is provided using an integration of Building Information Modeling (BIM) and Geographic Information Systems (GIS).
Note 2: The real-time data is obtained through extensive use of IoT sensors within the city.
Note 3: Developing and using a digital twin of a city involves handling large amounts of data from many sources, which is generally brought together using cloud computing.
Note 4: Artificial intelligence is often used to generate and evaluate different scenarios based on the City Digital Twin to help manage the city better.