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The emergence of cities,where more than half of the world population now lives,coupled with advances in sensor and data processing,has created a useful platform for better understanding of the complex interaction of physical spaces,environments,and people;examples include mobility,energy consumption and quality of the environment.The recent emergence of urban science centers and industry smart city initiatives point to how cities are being shifted from the problem space to the solution space.This presentation gives examples of the above by highlighting how sensors,observational data,and administrative and operational records are used in New York City.With more than 2000 datasets,New York City offers the largest and most comprehensive open datasets of any U.S.city.These datasets contain spatiotemporal components,requiring flexible exploration and visualizations,and queries that span multiple geographical regions over multiple times.An overview of the above data network will be given along with examples of novel multiscale sensing systems.