Distance between cell centroids — a5_cell_distance • a5R

Computes the distance between the centroids of pairs of A5 cells using the specified method.

Usage

a5_cell_distance(
  from,
  to,
  units = "m",
  method = c("haversine", "geodesic", "rhumb")
)

Arguments

from, to: a5_cell vectors (recycled to common length).
units: Character scalar specifying the distance unit (default "m"). Any unit convertible from metres via units::set_units() is accepted (e.g. "km", "mi").
method: Distance calculation method. One of "haversine" (great-circle, default), "geodesic" (WGS84 ellipsoid via Karney 2013), or "rhumb" (loxodrome / constant-bearing).

Value

A units::units vector of distances.

See also

a5_cell_to_lonlat() for cell centroids, a5_cell_area() for cell areas.

Examples

a <- a5_lonlat_to_cell(-3.19, 55.95, resolution = 24)
b <- a5_lonlat_to_cell(-3.10, 55.90, resolution = 24)
a5_cell_distance(a, b)
#> 7896.049 [m]
a5_cell_distance(a, b, units = "km")
#> 7.896049 [km]
a5_cell_distance(a, b, method = "geodesic")
#> 7914.811 [m]