project2set

0th

Percentile

Find Nearest Point in a Region

For each data point in a point pattern X, find the nearest location in a given spatial region W.

Keywords
spatial, math
Usage
project2set(X, W, ...)
Arguments
X
Point pattern (object of class "ppp").
W
Window (object of class "owin") or something acceptable to as.owin.
...
Arguments passed to as.mask controlling the pixel resolution.
Details

The window W is first discretised as a binary mask using as.mask. For each data point X[i] in the point pattern X, the algorithm finds the nearest pixel in W.

The result is a point pattern Y containing these nearest points, that is, Y[i] is the nearest point in W to the point X[i].

Value

  • A point pattern (object of class "ppp") with the same number of points as X in the window W.

See Also

project2segment, nncross

Aliases
  • project2set
Examples
He <- heather$fine[owin(c(2.8, 7.4), c(4.0, 7.8))]
  plot(He, main="project2set")
  X <- runifpoint(4, erosion(complement.owin(He), 0.2))
  points(X, col="red")
  Y <- project2set(X, He)
  points(Y, col="green")
  arrows(X$x, X$y, Y$x, Y$y, angle=15, length=0.2)
Documentation reproduced from package spatstat, version 1.42-2, License: GPL (>= 2)

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