Introduction to the Redis Geospatial data type
Redis geospatial indexes let you store coordinates and search for them. This data structure is useful for finding nearby points within a given radius or bounding box.
Suppose you're building a mobile app that lets you find all of the electric car charging stations closest to your current location.
Add several locations to a geospatial index:
> GEOADD locations:ca -122.27652 37.805186 station:1 (integer) 1 > GEOADD locations:ca -122.2674626 37.8062344 station:2 (integer) 1 > GEOADD locations:ca -122.2469854 37.8104049 station:3 (integer) 1
Find all locations within a 5 kilometer radius of a given location, and return the distance to each location:
> GEOSEARCH locations:ca FROMLONLAT -122.2612767 37.7936847 BYRADIUS 5 km WITHDIST 1) 1) "station:1" 2) "1.8523" 2) 1) "station:2" 2) "1.4979" 3) 1) "station:3" 2) "2.2441"
GEOADDadds a location to a given geospatial index (note that longitude comes before latitude with this command).
GEOSEARCHreturns locations with a given radius or a bounding box.
See the complete list of geospatial index commands.
- Redis Geospatial Explained introduces geospatial indexes by showing you how to build a map of local park attractions.
- Redis University's RU101 covers Redis geospatial indexes in detail.