Nearby Places Search with In-Memory Quadtrees

System Design diagram · made in Skemio

Architecture diagram illustrating location updates routed through a quadtree spatial index in memory, backed by Redis and PostGIS.

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What it shows

Quadtrees partition 2D space recursively into 4 bounded quadrants.
In-memory trees give sub-millisecond radius lookup without full table scans.
Geohash routing distributes spatial trees across distinct memory shards.

The takeaway

Recursive spatial partitioning delivers sub-millisecond radius searches at massive scale.

#SystemDesign
#Algorithms
#SoftwareArchitecture
#Geospatial
#Backend
#DataStructures

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