surfaceDistance: Earth surface distance between two points
Description
The surfaceDistance() function calculates the distance in kilometers between any two lat-lon pairs
using the Haversine equation.Usage
surfaceDistance(lat1_deg, lon1_deg, lat2_deg, lon2_deg)
Arguments
lat1_deg
latitude 1 (degrees)
lon1_deg
longitude 1 (degrees)
lat2_deg
latitude 2 (degrees)
lon2_deg
longitude 2 (degrees)
References
http://en.wikipedia.org/wiki/Haversine_formula