Intensity Estimates Using Quadrat Counts
Uses quadrat count data to estimate the intensity of a point pattern in each tile of a tessellation, assuming the intensity is constant in each tile.
## S3 method for class 'quadratcount' intensity(X, ..., image=FALSE)
X |
An object of class |
image |
Logical value specifying whether to return
a table of estimated intensities (the default)
or a pixel image of the estimated intensity ( |
... |
Arguments passed to |
This is a method for the generic function intensity.
It computes an estimate of the intensity of a point pattern
from its quadrat counts.
The argument X should be an object of class
"quadratcount". It would have been obtained by applying the function
quadratcount to a point pattern
(object of class "ppp"). It contains
the counts of the numbers of points of the point pattern falling in each
tile of a tessellation.
Using this information, intensity.quadratcount
divides the quadrat counts by the tile areas,
yielding the average density of points per unit area
in each tile of the tessellation.
If image=FALSE (the default), these intensity values
are returned in a contingency table. Cells of the contingency
table correspond to tiles of the tessellation.
If image=TRUE, the estimated intensity function is
returned as a pixel image. For each pixel, the pixel value is the
estimated intensity in the tile which contains that pixel.
If image=FALSE (the default), a contingency table.
If image=TRUE, a pixel image (object of class "im").
Adrian Baddeley Adrian.Baddeley@curtin.edu.au
and Rolf Turner r.turner@auckland.ac.nz
qa <- quadratcount(swedishpines, 4,3) qa intensity(qa) plot(intensity(qa, image=TRUE))
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