Compute area in square kilometers (numeric)

Safely compute polygon area in km^2 and return a plain numeric vector.

Usage

add_areasqkm(x)

Arguments

x

An `sf` object with polygonal geometry. If `x` is not in a projected CRS, `sf::st_area()` will compute ellipsoidal areas when possible.

Value

A numeric vector of areas in square kilometers.

Examples

if (FALSE) { # \dontrun{
library(sf)
nc <- sf::st_read(system.file("shape/nc.shp", package = "sf"), quiet = TRUE)
add_areasqkm(nc[1, ])
} # }