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500,000 or 20,000? How to estimate the size of a political rally properly

By Jumana Abu-Khalaf, Research Fellow in Computing and Security, Edith Cowan University
Paul Haskell-Dowland, Professor of Cyber Security Practice, Edith Cowan University

Image recognition algorithms, military satellites, and mobile data networks can all help estimate crowd sizes. But the underlying maths still comes down to a basic formula: density multiplied by area.

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