Given two sets of longitude/latitude locations computes the Great circle
(geogrpahic) distance matrix
among all pairings.
Usage
rdist.earth(loc1, loc2, miles = TRUE, R = NULL)
Arguments
loc1
Matrix of first set of lon/lat coordinates first column is the
longitudes
and second is the latitudes.
loc2
Matrix of second set of lon/lat coordinates first column is the
longitudes
and second is the latitudes. If missing x1 is used.
miles
If true distances are in statute miles if false distances in kilometers.
R
Radius to use for sphere to find spherical distances. If NULL the radius
is either in miles or kilometers depending on the values of the miles
argument. If R=1 then distances are of course in radians.
Value
The great circle distance matrix if nrow(x1)=m and nrow(
x2)=n then the returned matrix will be mXn.