randomCoordinates {geosphere}

Random or regularly distributed coordinates on the globe

Description

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.

Usage

randomCoordinates(n)
regularCoordinates(N)

Arguments

n

Sample size (number of points (coordinate pairs))

N

Number of 'parts' in which the earth is subdived )

Value

Matrix of lon/lat coordiantes

Author(s)

Robert Hijmans, based on code by Nils Haeck (regularCoordinates) and on suggstions by Michael Orion (randomCoordinates)

Examples

randomCoordinates(3)
regularCoordinates(1)