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db.posts.ensureIndex({"loc":"2d"})
If I do that and query by it…
What are the units?
db.posts.find({"loc": {"$within": {"$center" : [ user_center, user_radius ] }}})
What if I want to find something 5 miles away, what would my radius be?
your unit is whatever you store there. If you store in degrees on a globe that will be your unit for a
$within.If you use degrees then the
$withinfor 5 miles will be ~ 0.07 since a degree is 60 nautical miles.