spherical.direction.f: spherical direction
Usage
spherical.direction.f(cLonLat, oLonLat)
References
SAWADA, M. 2006. An open-source implementation of the modern analog technique (MAT) within the R computing environment. Computers and Geosciences, Vol 32(6):818-833, DOI information: 10.1016/j.cageo.2005.10.008