centerline (version 0.1)

cnt_path_guess: Guess polygon's centerline

Description

This function, as follows from the title, tries to guess the polygon centerline by connecting the most distant points from each other. First, it finds the point most distant from the polygon's centroid, then it searches for a second point, which is most distant from the first. The line connecting these two points will be the desired centerline.

Usage

cnt_path_guess(input, skeleton = NULL, ...)

Value

An sf, sfc or SpatVector class object of a LINESTRING geometry

Arguments

input

sf, sfc or SpatVector polygons object

skeleton

NULL (default) or cnt_skeleton() output. If NULL then polygon's skeleton would be estimated in the background using specified parameters (see inherit params below).

...

Arguments passed on to cnt_skeleton

keep

numeric, proportion of points to retain (0.05-Inf; default 0.5). See Details.

Examples

library(sf)
library(geos)
lake <-
  sf::st_read(
    system.file("extdata/example.gpkg", package = "centerline"),
    layer = "lake",
    quiet = TRUE
  ) |> 
  geos::as_geos_geometry()
# Find lake's centerline
lake_centerline <- cnt_path_guess(input = lake, keep = 1)
# Plot
plot(lake)
plot(lake_centerline, col = "firebrick", lwd = 2, add = TRUE)