Every day, we create 2.5 quintillion bytes of data — so much that 90% of the data in the world today has been created in the last two years alone. This data comes from everywhere: sensors used to gather climate information, posts to social media sites, digital pictures and videos, purchase transaction records, and cell phone GPS signals to name a few (IBM, 2013). This data can, compared to traditional data sources, be defined as ‘big’. Cities and urban environments are the main sources for big data, every minute 100,000 tweets are sent globally, Google receives 2,000,000 search requests and users share 684,478 pieces of content on Facebook (Mashable, 2012). An increasingly amount of this data stream is geolocated, from Check-ins via Foursquare through to Tweets and searches via Google Now, the data cities and individuals emit can be collected and viewed to make the data city visible, aiding our understanding of now only how urban systems operate but opening up the possibility of a real-time view of the city at large (Hudson-Smith, 2013). The talk explores systems such as The City Dashboard (http://www.citydashboard.org) and the rise of the Internet of Things (IoT) in terms of data collection, visualization and analysis. Joining these up creates a move towards the Smart City and via innovations in IoT a look towards augmented reality pointing towards the the creation of a ‘Smart Citizen’ ‘the Quantified Self’ and ultimately a Smart City.