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...system employs 24 standard meridians of longitude 15º apart, starting with the Prime Meridian. The lines all run from the North to the South Pole, at right angles to the Equator. These meridians are the centres of 24 standard time zones. In theory, standard time becomes successively one hour earlier at each 15º longitude west of the Prime Meridian, and one hour later at...

...system. Water companies monitor household level water use, of course. Energy companies look at electricity use and so on. So there's a lot of big data already being collected in a lot of different places now. The data in a small city can also come from sensors in the built environment. So these are sensors that can pick up different kinds of information about the urban...