GEODIST

GEODIST key member1 member2 [m|km|ft|mi]

#Example

redis> GEOADD Sicily 13.361389 38.115556 "Palermo" 15.087269 37.502669 "Catania"
(integer) 2
redis> GEODIST Sicily Palermo Catania
"166274.1516"
redis> GEODIST Sicily Palermo Catania km
"166.2742"
redis> GEODIST Sicily Palermo Catania mi
"103.3182"
redis> GEODIST Sicily Foo Bar
(nil)

Returns the distance between two members of a geospatial index