spatstat.geom (version 2.1-0)

distmap: Distance Map

Description

Compute the distance map of an object, and return it as a pixel image. Generic.

Usage

distmap(X, …)

Arguments

X

Any suitable dataset representing a two-dimensional object, such as a point pattern (object of class "ppp"), a window (object of class "owin") or a line segment pattern (object of class "psp").

…

Arguments passed to as.mask to control pixel resolution.

Value

A pixel image (object of class "im") whose grey scale values are the values of the distance map.

Details

The “distance map” of a set of points \(A\) is the function \(f\) whose value f(x) is defined for any two-dimensional location \(x\) as the shortest distance from \(x\) to \(A\).

This function computes the distance map of the set X and returns the distance map as a pixel image.

This is generic. Methods are provided for point patterns (distmap.ppp), line segment patterns (distmap.psp) and windows (distmap.owin).

See Also

distmap.ppp, distmap.psp, distmap.owin, distfun

Examples

# NOT RUN {
  data(cells)
  U <- distmap(cells)
  V <- distmap(letterR)
  if(interactive()) {
  plot(U)
  plot(V)
  }
# }