avocado> db.geo.near(0,0).distance();
{ "name" : "0_0", "loc" : [ 0, 0 ], "_id" : "144958:24840824", "_distance" : 0 }
{ "name" : "0_10", "loc" : [ 0, 10 ], "_id" : "144958:24906360", "_distance" : 1111949.2664455874 }
.
.
{ "name" : "-20_-10", "loc" : [ -20, -10 ], "_id" : "144958:19925624", "_distance" : 2476171.4106209576 }
{ "name" : "-10_-20", "loc" : [ -10, -20 ], "_id" : "144958:22284920", "_distance" : 2476171.4106209576 }
...more results...