randomCoordinates returns a 'uniform random sample' in the sense that the probability that a point is drawn from any region is equal to the area of that region divided by the area of the entire sphere. This would not happen if you took a random uniform sample of longitude and latitude, as the sample would be biased towards the poles.
regularCoordiaates returns a set of coordinates that are regularly distributed on the globe.
Sample size (number of points (coordinate pairs))
Number of 'parts' in which the earth is subdived )
Matrix of lon/lat coordiantes
Robert Hijmans, based on code by Nils Haeck (regularCoordinates), http://mathforum.org/kb/message.jspa?messageID=3985660&tstart=0
and suggstions by Michael Orion (randomCoordinates), http://sci.tech-archive.net/Archive/sci.math/2005-09/msg04691.html
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