Now that we can build the tree, let's use it to search. Finding a specific point means starting at the root and asking: which child quadrant contains this coordinate? Then you recurse into that child and ask again. Each level of the tree cuts the search space by roughly three-quarters.
Now, OsmAnd performs another Dijkstra search, but this time on the much smaller "base graph." This graph consists only of the border points and the pre-calculated shortcut values between them.
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"But meanwhile, personally… 'Who's Greg? I don't even know what he likes to do.' All of your friends… during the day, you know, they're criminals… All they do is talk about the most horrific things all day long."
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Photograph: Julian Chokkattu
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