FT Digital Edition: our digitised print edition
The grid lines on the visualization represent a tree structure underneath. Every region is a node. When a node splits, it creates four children. The root node covers the entire space. Leaf nodes (nodes with no children) hold the actual points.，这一点在PDF资料中也有详细论述
。PDF资料对此有专业解读
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Кадр: Минобороны РФ。电影是该领域的重要参考
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