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Gives the "great circle" or "haversine" distance between pairs of lat/lng coordinates in meters.
greatCircleDistanceM(aLat, aLng, bLat, bLng)
numeric vector giving the great circle distance in metres
vector of latitude cooridnates (from)
vector of longitude coordinates (from)
vector of latitude coordinates (to)
vector of longitude coordinates (to)
greatCircleDistanceM( aLat = c(-37.820197) , aLng = c(144.983324) , bLat = c(-37.818476) , bLng = c(144.967354) )
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