Re: [R] spatial simulation

From: Ted Harding <ted.harding_at_nessie.mcc.ac.uk>
Date: Sat, 02 Jun 2007 08:33:21 +0100 (BST)


On 02-Jun-07 01:06:48, Kitty Lee wrote:
> Dear R-users,
>
> I'm trying to do some spatial simulation. I have two covariates,
> Z and C. I want to examine their relationship under different
> spatial distribution.
>
> I have no problem simulating completely spatial random process
> but I'm totally stuck on poisson (cluster) pattern. I already
> have a dataset with Z and C (obs=575) and I know the relationship
> between them. Using these 575 cases, how can I simulate a clustered
> process and have a dataset that has four columns:
>
> x-coor y-coor z c
>
> I know I can use rpois or pcp.sim to generate points that clustered
> and then use cbind to attach Z and C values. But the problem is my
> observations will not be spatially clustered. How can I simulate so
> that now Z is spatially clustered?
>
> Thanks!
>
> K.

Have a look at the package spatstat:

Description: Spatial Point Pattern data analysis, modelling and

               simulation including multitype/marked points and
               spatial covariates

It has a flexible repertoire of spatial point processes that you can simulate from.

Best wishes,
Ted.



E-Mail: (Ted Harding) <ted.harding_at_nessie.mcc.ac.uk> Fax-to-email: +44 (0)870 094 0861
Date: 02-Jun-07                                       Time: 08:33:17
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