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.
前款第一项、第二项、第三项规定的行为人违反治安管理情节严重、影响恶劣的，或者第一项、第三项规定的行为人在一年以内二次以上违反治安管理的，不受前款规定的限制。
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"At that point I called the fire brigade," she remembers. They advised her to leave the property immediately. McConnell says the fire developed "very, very quickly". While Kent Fire & Rescue Service battled the blaze for hours, the McConnell family home was left partially destroyed.