| earthDist | R Documentation | 
earthDist calculates distance (in kilometers) between two 
lon/lat positions.
The function assumes a mean equatorial Earth radius of 6378.145 km. One of the 
lon/lat positions (i.e. lon1 and lat1) can be a vector of positions to compare against
the other lon/lat position (i.e. lon2 and lat2)
earthDist(lon1, lat1, lon2, lat2)
| lon1 | Longitude 1 (in decimal degrees) | 
| lat1 | Latitude 1 (in decimal degrees) | 
| lon2 | Longitude 2 (in decimal degrees) | 
| lat2 | Latitude 2 (in decimal degrees) | 
Vector of distances (km)
earthDist(0,0,20,20)
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