Calculate range of distances (min-max) between all points in one or two rectangular objects containing lon-lat coordinates.
georange(x, y, sequential = FALSE, measure = "cheap")
Rectangular object (matrix,
Optional second object which, if passed, results in distances
calculated between each object in
One of "haversine" "vincenty", "geodesic", or "cheap" specifying desired method of geodesic distance calculation; see Notes.
A named vector of two numeric values: minimum and maximum, giving the respective distances in metres.
measure = "cheap" denotes the mapbox cheap ruler
measure = "geodesic"
denotes the very accurate geodesic methods given in Karney (2013)
"Algorithms for geodesics" J Geod 87:43-55, and as provided by the
n <- 50 x <- cbind (-10 + 20 * runif (n), -10 + 20 * runif (n)) y <- cbind (-10 + 20 * runif (2 * n), -10 + 20 * runif (2 * n)) colnames (x) <- colnames (y) <- c ("x", "y") # All of the following returns vector of two values: minimum and maximum: d0 <- georange (x) d1 <- georange (x, y) d2 <- georange (x, sequential = TRUE) d0_2 <- georange (x, measure = "geodesic") # nanometre-accurate version of d0