"They're losing lots of habitat - lots of woodland," says Spencer. "And we're also knocking down old buildings, making our homes warmer, more airtight - there are less places for them to go."
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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.
第六条 治安管理处罚必须以事实为依据，与违反治安管理的事实、性质、情节以及社会危害程度相当。，这一点在同城约会中也有详细论述