The Geo set is actually stored as a sorted set (zset in Redis) and all the commands in a sorted set can be applied to the Geo data type. For example, removing a Geo index from a Geo set can be done by ZREM, and retrieving all the members of a Geo set can be achieved by ZRANGE.
For your reference, the implementation of GEOHASH is based on a 52-bit integer representation (which gives an accuracy of less than 1 meter). When a standard GEOHASH string is needed, you can call GEOHASH to get a string whose length is 11.
For performance concerns, GEORADIUS has the time complexity of O(N+log(M)) where N is the number of elements inside the bounding box of the circular area delimited by center and radius, according to the documents ...
