Tristan Hotham

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People and politics

Who Held the Map?

Twelve centuries of the world map, 800 to 2010, each piece of land filled with the flag of whoever held it. In 1000 no land can honestly be shown with a flag; by 2010, 97% can.

Who Held the Map?: preview of the interactive map

This is an interactive data study by Dr Tristan Hotham, built from open data. The map runs in your browser: explore it, search for places and switch layers. The write-up explains the method and what the data shows, and the data and code are open for anyone to reuse.

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