Geospatial indexing

Geohashes, quadtrees and S2 cells turn a position into a key so nearby points share a prefix. That is how ride-hailing and delivery apps find drivers near you quickly.

Where it shows up in real systems

  • Geospatial index

    Positions are encoded as geohashes or S2 cells so nearby points share a key prefix. Keeping moving objects in memory, such as drivers updating every few seconds, avoids hammering the main database with writes.

    In production: Redis GEO, PostGIS, Elasticsearch geo queries, Uber H3, Google S2

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