'Law of cosines' great circle distance
The shortest distance between two points (i.e., the 'great-circle-distance' or 'as the crow flies'), according to the 'law of the cosines'. This method assumes a spherical earth, ignoring ellipsoidal effects.
distCosine(p1, p2, r=6378137)
p1 |
longitude/latitude of point(s). Can be a vector of two numbers, a matrix of 2 columns (first one is longitude, second is latitude) or a SpatialPoints* object |
p2 |
as above |
r |
radius of the earth; default = 6378137 m |
Vector of distances in the same unit as r (default is meters)
Robert Hijmans
distCosine(c(0,0),c(90,90))
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