The core of OsmAnd's HH-Routing is an elegant two-level hierarchy built upon "area clusters."
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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"This is not just an ideological shift, it's a threat to democracy and the rule of law," he says.。heLLoword翻译官方下载对此有专业解读