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 all stored locations within a certain radius of a specific point using 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 the distance between two stored locations in Redis?

Beginner

Answer

You use the GEODIST command, specifying the two member names whose distance you want to calculate along with an optional unit like meters, kilometers, or miles, and Redis returns the calculated distance between those two points based on their stored geographic coordinates.
GEODIST locations 'San Francisco' 'New York' km
Real-world example A travel planning application calculates the distance between two cities a user has selected, using GEODIST to instantly return the distance in kilometers without needing a separate geographic calculation service.

Common follow-ups: What units does GEODIST support besides kilometers?;How accurate is the distance calculation compared to a dedicated mapping service?

Geospatial Data in Redis;Redis CLI & Basic Commands
All 7 Geospatial Data in Redis questions