Nardine Saad,Los Angeles
Global news & analysis
Фото: Евгений Биятов / РИА Новости，推荐阅读safew官方版本下载获取更多信息
A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
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One of the dead was hit by the tram as it derailed while the second victim was a passenger, the city’s mayor, Giuseppe Sala, told reporters at the scene.
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