Nothing
"rdist.earth" <-
function (loc1, loc2, miles = TRUE, R = NULL) {
# this is the fields function rdist.earth()
# calculates great circle distances between all pairs of points
if (is.null(R)) {
if (miles)
R <- 3963.34
else R <- 6378.388
}
if (missing(loc2))
loc2 <- loc1
coslat1 <- cos((loc1[, 2] * pi)/180)
sinlat1 <- sin((loc1[, 2] * pi)/180)
coslon1 <- cos((loc1[, 1] * pi)/180)
sinlon1 <- sin((loc1[, 1] * pi)/180)
coslat2 <- cos((loc2[, 2] * pi)/180)
sinlat2 <- sin((loc2[, 2] * pi)/180)
coslon2 <- cos((loc2[, 1] * pi)/180)
sinlon2 <- sin((loc2[, 1] * pi)/180)
pp <- cbind(coslat1 * coslon1, coslat1 * sinlon1, sinlat1) %*%
t(cbind(coslat2 * coslon2, coslat2 * sinlon2, sinlat2))
R * acos(ifelse(pp > 1, 1, pp))
}
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