Distance Map of Point Pattern
Computes the distance from each pixel to the nearest point in the given point pattern.
## S3 method for class 'ppp' distmap(X, ...)
X |
A point pattern (object of class |
... |
Arguments passed to |
The “distance map” of a point pattern X is the function
f whose value f(u) is defined for any two-dimensional
location u as the shortest distance from u to X.
This function computes the distance map of the point pattern X
and returns the distance map as a pixel image. The greyscale value
at a pixel u equals the distance from u to the nearest
point of the pattern X.
Additionally, the return value
has two attributes, "index" and "bdry", which are
also pixel images. The grey values in "bdry" give the
distance from each pixel to the bounding rectangle of the image.
The grey values in "index" are integers identifying which
point of X is closest.
This is a method for the generic function distmap.
A pixel image (object of class "im") whose greyscale values
are the values of the distance map.
The return value has attributes "index" and "bdry"
which are also pixel images.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au
and Rolf Turner r.turner@auckland.ac.nz
Generic function distmap and other methods
distmap.psp,
distmap.owin.
Generic function distfun.
Nearest neighbour distance nncross
data(cells)
U <- distmap(cells)
if(interactive()) {
plot(U)
plot(attr(U, "bdry"))
plot(attr(U, "index"))
}Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.