Chapter 30: Geospatial & Location Services

Part IX: High-Scale System Design Case Studies & Applied Infrastructure

Geospatial and location services turn coordinates into indexes, proximity results, presence updates, tiles, and routes. The chapters in this category cover spatial search, nearby-friend privacy, and the distributed infrastructure behind map experiences.

30.1 System Design: Proximity Service (Spatial Indexing, Geohash Grid Searching, Nearest Neighbor Queries)
30.2 System Design: Nearby Friends Service (Location Tracking, Pub/Sub Mesh, Cell-Based WebSocket Routing)
30.3 System Design: Google Maps Infrastructure (Tile Rendering Graph Processing, Routing Engine, A* Pathfinding at Scale)
Chapter 30 References