Get points on a great circle as defined by the shortest distance between two specified points
Usage
greatCircle(p1, p2, n=360)
Arguments
p1
longitude/latitude of point(s), in degrees; 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. Should have same length as p1, or a single point (or vice versa when p1 is a single point
n
The requested number of points on the Great Circle