intermediate: Intermediate points on a great circle (sphere)
Description
Get intermediate points (way points) between the two locations with longitude/latitude coordinates. gcIntermediate is based on a spherical model of the earth and internally uses distCosine.
longitude/latitude of a single point, in degrees. This 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 for p1
n
integer. The desired number of intermediate points
breakAtDateLine
logical. Return two matrices if the dateline is crossed?
addStartEnd
logical. Add p1 and p2 to the result?
sp
logical. Return a SpatialLines object?
sepNA
logical. Rather than as a list, return the values as a two column matrix with lines seperated by a row of NA values? (for use in 'plot')
Author
Robert Hijmans based on code by Ed Williams (great circle)