Calculate the Great-Circle Distance between two points in kilometers

Calculate the great-circle distance between two points using the Haversine function.

Usage

haversine(lat1, lon1, lat2, lon2, r = 6371)

Arguments

lat1

The latitude of point 1 in degrees.

lon1

The longitude of point 1 in degrees.

lat2

The latitude of point 2 in degrees.

lon2

The longitude of point 2 in degrees.

r

The average earth radius.

Value

A numeric value of the distance between point 1 and 2 in kilometers.

Examples

fra <- c(50.03333, 8.570556) # Frankfurt Airport
ord <- c(41.97861, -87.90472) # Chicago O'Hare International Airport
haversine(fra[1], fra[2], ord[1], ord[2]) # 6971.059 km
#> [1] 6971.059