distmap.lpp {spatstat.linnet} | R Documentation |
Distance Map of Point Pattern on Linear Network
Description
Computes the distance from each pixel to the nearest point in the given point pattern on a linear network.
Usage
## S3 method for class 'lpp'
distmap(X, ..., k=1)
Arguments
X |
A point pattern on a linear network (object of class |
k |
Integer. The distance to the |
... |
Arguments passed to |
Details
This is a method for the generic function distmap
.
It computes the distance map of the point pattern X
as a pixel image on the network.
At a pixel u
, the greyscale value
equals the distance from u
to the
nearest point of the pattern X
(or the k
-th nearest point
of X
).
Value
A pixel image on the network (object of class "linim"
)
whose greyscale values are the values of the distance map.
Distance values
The pixel values in the image distmap(X)
are distances,
expressed as multiples of the unit of length of the spatial
coordinates in X
.
The unit of length is given by unitname(X)
.
Note that, if the unit of length in X
is a composite
expression such as ‘2 microns’,
then the values in distmap(X)
are expressed as multiples
of 2 microns, rather than being expressed in microns.
Author(s)
Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner rolfturner@posteo.net and Ege Rubak rubak@math.aau.dk.
See Also
Generic function distmap
and methods.
Examples
plot(distmap(spiders))