The shortest distance between two points (i.e., the 'great-circle-distance' or 'as the crow flies'), according to the 'haversine method'. This method assumes a spherical earth, ignoring ellipsoidal effects. Note that this version is implemented in C++. A quick benchmark to the version of geosphere showed it to be a non-insignificant speed enhancement. The algorithm converges in one-twentieth of the original time.

haversine(lat_from, lon_from, lat_to, lon_to, r = 6378137)

## Arguments

lat_from Latitude of point. Longitude of point. Latitude of point. Longitude of point. Radius of the earth; default = 6378137m

## Value

Vector of distances in the same unit as r (default in meters).

## Details

The Haversine ('half-versed-sine') formula was published by R.W. Sinnott in 1984, although it has been known for much longer.

## References

Sinnott, R.W, 1984. Virtues of the Haversine. Sky and Telescope 68(2): 159.

Martin Haringa

## Examples

haversine(53.24007, 6.520386, 53.24054, 6.520386)
#> [1] 52.32016