Hi Adrian,

I can not see any reference about scanmeasure and deviation functions in
the current spatstat manual: are these included in the newest version of
spatstat?

Mathieu

2012/1/9 <Adrian.Baddeley@csiro.au>

>
> The following message appeared on R-help but this discussion should be
> moved to R-sig-geo
>
> On 07/01/12 02:17, herbert8686@gmx.de wrote:
>
> > I was searching through the spatstat manual in order to find a function
> >  to simulate a Poisson pattern only within a fixed radius (circular
> moving window)
>  > around individual points. If points are distributed heterogeneously
> over a
> > large area this may help to only assess deviation from CSR within the
> window
> > and thus does not require additional information on a covariate.
> > I could not find such a function in spatstat. Can please anyone help?
>
> What do you want to happen if two of the circles overlap? Should the
> density of random points be twice as high?
>
> If the answer is 'yes' then do the following (where X is your original
> point pattern of centres, and 'r' is the radius of the circles, and
> 'lambda' is the intensity of random points per unit area in each circle)
>
>       V <- scanmeasure(X, r)
>       V <- eval.im(lambda * V)
>       Y <- rpoispp(V)
>
> If the answer is 'no' then do
>       W <- dilation(X, r)
>       Y <- rpoispp(lambda, win=W)
>
> Adrian Baddeley
>
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