Great circle
Get points on a great circle as defined by the shortest distance between two specified points
greatCircle(p1, p2, n=360, sp=FALSE)
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 |
n |
The requested number of points on the Great Circle |
sp |
Logical. Return a SpatialLines object? |
A matrix of points, or a list of such matrices (e.g., if multiple bearings are supplied)
Robert Hijmans, based on a formula provided by Ed Williams
greatCircle(c(5,52), c(-120,37), n=36)
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