tess

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Create a Tessellation

Creates an object of class "tess" representing a tessellation of a spatial region.

Keywords
spatial, datagen
Usage
tess(..., xgrid = NULL, ygrid = NULL, tiles = NULL, image = NULL)
Arguments
...
Ignored.
xgrid,ygrid
Cartesian coordinates of vertical and horizontal lines determining a grid of rectangles. Incompatible with other arguments.
tiles
List of tiles in the tessellation. A list, each of whose elements is a window (object of class "owin"). Incompatible with other arguments.
image
Pixel image which specifies the tessellation. Incompatible with other arguments.
Details

A tessellation is a collection of disjoint spatial regions (called tiles) that fit together to form a larger spatial region. This command creates an object of class "tess" that represents a tessellation.

Three types of tessellation are supported: [object Object],[object Object],[object Object] There are methods for print, plot, [ and [<- for tessellations. Use tiles to extract the list of tiles in a tessellation.

Tessellations can be used to classify the points of a point pattern, in split.ppp, cut.ppp and by.ppp.

Value

  • An object of class "tess" representing the tessellation.

See Also

plot.tess, [.tess, as.tess, tiles, intersect.tess, split.ppp, cut.ppp, by.ppp, quadrats.

Aliases
  • tess
Examples
A <- tess(xgrid=0:4,ygrid=0:4)
  A
  B <- A[c(1, 2, 5, 7, 9)]
  B
  v <- as.im(function(x,y){factor(round(5 * (x^2 + y^2)))}, W=owin())
  levels(v) <- letters[seq(length(levels(v)))]
  E <- tess(image=v)
  E
Documentation reproduced from package spatstat, version 1.14-7, License: GPL (>= 2)

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