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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
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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.The Conversation


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