R help - Jan 2012 - Spatial data, rpoispp, using window with fixed radius?

Dear All,

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?

Thanks,

Herb

--

What's wrong with rpoispp in spatstat? It can simulate over a polygon,
which can of course be used to closely approximate a circle. There is also
spsample in the sp package.

I'd also suggest asking this question on r-sig-geo.

-- 
Don MacQueen

Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062





On 1/6/12 5:17 AM, "herbert8686 at gmx.de" <herbert8686 at
gmx.de> wrote:
>Dear All,
>
>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?
>
>Thanks,
>
>Herb
>
>--
>
>______________________________________________
>R-help at r-project.org mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.

On 07/01/12 02:17, herbert8686 at gmx.de wrote:
> Dear All,
>
> 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?
It's not clear to me just what you want to do, but it *sounds* like you want
to simulate a cluster process with each cluster being a Poisson pattern
in a disk of fixed radius.  If so, the function rMatClust() does just 
what you
want.

It seems to me also possible that you want to "pre-specify" the
cluster
centres,
or parent points.  Such a capability is *not* currently built into 
"spatstat" but
would not be hard to code up.  Let me know if you indeed want to pre-specify
the cluster centres.

     cheers,

         Rolf Turner