This function uses the haversine formula to calculate the great circle distance between two locations, identified by their latitudes and longitudes. It is borrowed from rnoaa (https://github.com/ropenscilabs/rnoaa/blob/master/R/meteo_distance.R) and included here as rnoaa is a large package that is rather unrelated to maxcovr. I have renamed it from meteo_spherical_distance to spherical_distance
spherical_distance(lat1, long1, lat2, long2)
Latitude of the first location.
Longitude of the first location.
Latitude of the second location.
Longitude of the second location.
A numeric value giving the distance in meters between the pair of locations.
This function assumes an earth radius of 6,371 km.
spherical_distance(lat1 = -27.4667, long1 = 153.0217, lat2 = -27.4710, long2 = 153.0234)#>  506.7013