This command is exactly like `GEORADIUS` with the sole difference that instead
of taking, as the center of the area to query, a longitude and latitude value,
it takes the name of a member already existing inside the geospatial index
represented by the sorted set.

As per Redis 6.2.0, GEORADIUS command family are considered deprecated. Please
prefer `GEOSEARCH` and `GEOSEARCHSTORE` in new code.

The position of the specified member is used as the center of the query.

Please check the example below and the `GEORADIUS` documentation for more
information about the command and its options.

Note that `GEORADIUSBYMEMBER_RO` is also available since Redis 3.2.10 and Redis
4.0.0 in order to provide a read-only command that can be used in replicas. See
the `GEORADIUS` page for more information.

@examples

```cli
GEOADD Sicily 13.583333 37.316667 "Agrigento"
GEOADD Sicily 13.361389 38.115556 "Palermo" 15.087269 37.502669 "Catania"
GEORADIUSBYMEMBER Sicily Agrigento 100 km
```