#' earth.dist
#'
#' Function to calculate the metric distance between two coordinates (lat, lon)
#' @param long1 longitude of the first coordinate
#' @param lat1 latitude of the first coordinate
#' @param long2 longitude of the second coordinate
#' @param lat2 latitude of the second coordinate
#' @export
#' @examples
#' earth.dist(-70.34, 43.23, -71.29, 43.21)
earth.dist <- function (long1, lat1, long2, lat2)
{
rad <- pi/180
a1 <- lat1 * rad
a2 <- long1 * rad
b1 <- lat2 * rad
b2 <- long2 * rad
dlon <- b2 - a2
dlat <- b1 - a1
a <- (sin(dlat/2))^2 + cos(a1) * cos(b1) * (sin(dlon/2))^2
c <- 2 * atan2(sqrt(a), sqrt(1 - a))
R <- 6378.145
d <- R * c
return(d)
}
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