All 7 Geospatial Data in Redis questions
More in Geospatial Data in Redis
What geospatial capabilities does Redis provide, and what commands are used to add location data? How do you find the distance between two stored locations in Redis? How can you retrieve the actual stored coordinates for a specific member in a Redis geospatial dataset? How do you remove a specific location from a Redis geospatial dataset once it is no longer needed? How would you design a real time location tracking system for a fleet of delivery vehicles using Redis geospatial commands? What is the underlying geohash based encoding that Redis uses to store geospatial data, and how does it affect the accuracy of location queries?
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How do you find all stored locations within a certain radius of a specific point using Redis?

Intermediate

Answer

You use the GEOSEARCH command, specifying a center point either by coordinates or by an existing member's name, along with a radius and unit, and Redis returns all members within that stored dataset that fall within the specified distance from the center point.
GEOSEARCH locations FROMMEMBER 'San Francisco' BYRADIUS 500 km ASC
Real-world example A ride sharing application finds all available drivers within a five kilometer radius of a customer's pickup location using GEOSEARCH, quickly identifying the nearest available options.

Common follow-ups: What is the difference between searching from a member versus searching from specific coordinates?;Can GEOSEARCH also search within a rectangular area instead of a radius?

Sets & Sorted Sets in Redis;Redis Performance Tuning & Benchmarking
All 7 Geospatial Data in Redis questions