R: Distance Map

distmap {spatstat}

R Documentation

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.

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).

Value

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

Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au

and Rolf Turner r.turner@auckland.ac.nz

Examples

  data(cells)
  U <- distmap(cells)
  data(letterR)
  V <- distmap(letterR)
  ## Not run: 
  plot(U)
  plot(V)
  
## End(Not run)

[Package spatstat version 1.56-0 Index]