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I’m using MongoDB geospatial queries — $near, geoNear, etc. — and I’d like to know how to turn the dis result of the geoNear command as well as the radius argument for $within queries to/from readable units like miles or kilometers.
if your data is in geographic coordinates (i.e. 30.47921 N -121.45724 W) then you need to convert your underlying projection with the units you want (choose a projection that preserves distance) or you need to convert the distance in coordinates to something like miles.
Use the Haversine formula for calculations
http://www.movable-type.co.uk/scripts/latlong.html