The dramatically increasing rate of urbanization is driving demand for more intelligent urban and environmental systems. City leaders and service providers are looking to base decisions on data, and to so, are deploying sensors extensively. However, even the most advanced cities are having difficulties assimilating and analyzing data collected from these sensors. In this talk, I will describe research we are conducting into creating analytics, optimizations, and systems for sustainable energy, constrained resources (e.g., municipal water management), transportation, and the underlying city fabric that assimilates and shares data and models for these domains. © 2011 IEEE.