The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.
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Elsewhere, Chelsea overcome Manchester United after extra time in a heavyweight rematch of last year’s final, Liverpool claim Merseyside derby bragging rights, and Birmingham and Charlton keep WSL 2 representation alive in the last eight. The panel also reflects on Chatham Town’s historic cup run and what the growing gap between the WSL and WSL 2 tells us about the current landscape.
Tony Jolliffe/BBC News