Contents -- Introduction -- Data - Source and Collection -- Catching the World' s Eyes -- Hubcab - Exploring the Benefits of Shared Taxi Services -- Data Availability / Data Relevance: Evaluating Real- Time Urban Information Usage in Singapore -- Tracking Waste to Reduce Waste -- New York Talk Exchange: Revealing Urban Dynamics through the Global Telecommunications Network -- Representation - Models and Visualization -- The City as a Digital Public Space - Notes for the Design of Live Urban Data Platforms -- City Portraits and Caricatures -- Computational Models of Mobility: A Perspective from Mobile Phone Data -- Seeing the City through Data / Seeing Data through the City -- Places - Implications for Design -- Networks of the Built Environment -- How Polycentric Are Our Cities? -- The Kind of Problem a City Is: New Perspectives on the Nature of Cities from Complex Systems Theory -- Digital Approach to Regional Delineation -- Biographies.