Convert Data To Tessellation
Converts data specifying a tessellation,
in any of several formats, into an object of class "tess".
as.tess(X) ## S3 method for class 'tess' as.tess(X) ## S3 method for class 'im' as.tess(X) ## S3 method for class 'owin' as.tess(X) ## S3 method for class 'quadratcount' as.tess(X) ## S3 method for class 'list' as.tess(X)
X |
Data to be converted to a tessellation. |
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.
This function converts data in any of several formats
into an object of class "tess" for use by the spatstat
package. The argument X may be
an object of class "tess".
The object will be stripped of any extraneous attributes
and returned.
a pixel image (object of class "im") with pixel values that
are logical or factor values. Each level of the factor will
determine a tile of the tessellation.
a window (object of class "owin"). The result will be a
tessellation consisting of a single tile.
a set of quadrat counts (object of class "quadratcount")
returned by the command quadratcount.
The quadrats
used to generate the counts will be extracted and returned as a
tessellation.
a quadrat test (object of class "quadrattest")
returned by the command quadrat.test.
The quadrats
used to perform the test will be extracted and returned as a
tessellation.
a list of windows (objects of class "owin")
giving the tiles of the tessellation.
The function as.tess is generic, with methods for
various classes, as listed above.
An object of class "tess" specifying a tessellation.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au
and Rolf Turner r.turner@auckland.ac.nz
# pixel image
v <- as.im(function(x,y){factor(round(5 * (x^2 + y^2)))}, W=owin())
levels(v) <- letters[seq(length(levels(v)))]
as.tess(v)
# quadrat counts
data(nztrees)
qNZ <- quadratcount(nztrees, nx=4, ny=3)
as.tess(qNZ)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.