simplify.owin: Approximate a Window by a Simpler Polygon
In spatstat.geom: Geometrical Functionality of the 'spatstat' Family

simplify.owin

R Documentation

Approximate a Window by a Simpler Polygon

Description

Given a window, this function finds a simpler polygon that approximates it.

Usage

simplify.owin(W, dmin)

Arguments

`W`	The window which is to be simplied. An object of class `"owin"`.
`dmin`	Numeric value. The smallest permissible length of an edge.

Details

This function simplifies a polygon W by recursively deleting the shortest edge of W until all remaining edges are longer than the specified minimum length dmin, or until there are only three edges left.

The argument W must be a window (object of class "owin"). If W is a rectangle, it is returned without alteration. If W is a binary mask, it is first converted to a polygonal window (with many small vertical and horizontal edges), then simplified.

Value

Another window (object of class "owin") of type "polygonal".

Author(s)

\spatstatAuthors

Examples

  plot(letterR, col="red")
  plot(simplify.owin(letterR, 0.3), col="blue", add=TRUE)

  W <- Window(chorley)
  plot(W)
  WS <- simplify.owin(W, 2)
  plot(WS, add=TRUE, border="green")
  points(vertices(WS))

spatstat.geom documentation built on Aug. 8, 2025, 6:28 p.m.