400km² and 21,000 images: Mapping the Yangtze River

The Yangtze River is Zhenjiang’s lifeline and a constant threat. To prepare for floods, local authorities made one really big drone map.

Zhenjiang is one of China’s busiest ports. Over 140 million tonnes of cargo passed through the inland river port in 2013 alone. Because of its proximity to both the Yangtze River and the Grand Canal, Zhenjiang has been an important transportation hub for centuries.

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