# intensity.quadratcount

##### 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.

- Keywords
- spatial, nonparametric

##### Usage

```
## S3 method for class 'quadratcount':
intensity(X, ..., image=FALSE)
```

##### Arguments

- X
- An object of class
`"quadratcount"`

. - image
- Logical value specifying whether to return
a table of estimated intensities (the default)
or a pixel image of the estimated intensity (
`image=TRUE`

). - ...
- Arguments passed to
`as.mask`

to determine the resolution of the pixel image, if`image=TRUE`

.

##### Details

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.

##### Value

- If
`image=FALSE`

(the default), a contingency table. If`image=TRUE`

, a pixel image (object of class`"im"`

).

##### See Also

##### Examples

```
qa <- quadratcount(swedishpines, 4,3)
qa
intensity(qa)
plot(intensity(qa, image=TRUE))
```

*Documentation reproduced from package spatstat, version 1.37-0, License: GPL (>= 2)*