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Published byElvis Clements Modified over 2 years ago

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CS144: Spatial Index

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Example Dataset

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Grid File (2 points per bucket) 40 55 225 90

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Grid File Data Structure 0 − 4040 − 5555 − 0 − 90 90 − 225 225 − 30,260 25,400 25,60 45,60 50,75 50,100 50,120 70,110 85,140 60,260 45,350 50,275

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Querying Grid File 40 55 225 90 123 4 7 56 98

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Grid File Insertion 40 55 225 90

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Quad Tree (2 points per bucket)

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First Level

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Quad Tree (2 points per bucket) Second Level

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Quad Tree Data Structure 50,200 75,100 25,300 25,60 45,60 50,275 60,260 50,75 50,100 85,14050,120 70,110 30,26025,400 45,300 SW SE NE NW

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Querying Quad Tree

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Quad Tree Insertion

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General ( n x m ) Quad Tree At each level, split into ( n x m ) subregions

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