Add locations to a Redis geospatial index with GEOADD
domain: redis.io · 7 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Connect with any Redis client (redis-cli, redis-py, node-redis, go-redis).
Add one or more points: GEOADD key longitude latitude member [longitude latitude member ...]. IMPORTANT: longitude comes BEFORE latitude (standard x,y order) — reversing them silently stores wrong positions.
Add several in one call: GEOADD Sicily 13.361389 38.115556 "Palermo" 15.087269 37.502669 "Catania".
Prevent updates to existing members with NX, or force update-only with XX (Redis 6.2+, mutually exclusive).
Use CH so the reply counts changed elements (added + coordinate updates) instead of only new adds.
Inspect results: distance with GEODIST, nearby points with GEOSEARCH, coordinates with GEOPOS.
Remove a member with ZREM key member — there is no GEODEL; a geo index is just a sorted set underneath.
Known gotchas
Coordinates are validated: longitude must be in -180..180 and latitude in -85.05112878..85.05112878 (near-polar areas are not indexable); out-of-range values error.
Longitude-before-latitude ordering is the #1 footgun; the docs use standard x,y order.
Distance math uses the Haversine formula on a perfect-sphere model — worst-case error up to ~0.5%; fine for geo apps, not for error-critical systems.
O(log(N)) per item added. The Geo index is a sorted set, so all Z* commands work on it directly.
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