R: Distance Map

distmap {spatstat.geom} | 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

### See Also

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

### Examples

      data(cells)
      U <- distmap(cells)
      V <- distmap(letterR)
      if(interactive()) {
      plot(U)
      plot(V)
      }

[Package spatstat.geom version 2.3-2 Index]