Description Usage Arguments Value Author(s) References Examples

Great circle or geodesic distance.

1 | ```
GCdistance(lat1,lon1,lat2,lon2)
``` |

`lat1` |
Latitude of points of origin. |

`lon1` |
Longitude of points of origin. |

`lat2` |
Latitude of points of destination. |

`lon2` |
Longitude of points of destination. |

Distance between origin and destination points in metres.

Javier G. Corripio

http://williams.best.vwh.net/avform.htm#Dist,

http://mathworld.wolfram.com/GreatCircle.html.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | ```
GCdistance(0,0,0,180)*2
# distance between the center of US states
data(state)
ddd=matrix(nrow=50,ncol=50,dimnames=list(state.name,state.name))
for (i in 1:50){
for (j in 1:50){
distij=GCdistance(state.center$y[i],state.center$x[i],
state.center$y[j],state.center$x[j])
# round to miles
ddd[i,j]=round(distij/1609.344,2)
}
}
# format and print results for the 10 firsts states
as.dist(ddd[1:10,1:10])
``` |

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