[R-sig-Geo] random samples of a grid

[Edzer J. Pebesma]

Jeff, you may want to have a look at function spsample in package sp.
--
Edzer

Jeffrey Stratford wrote:
> Hi,  is there a way to sample an ESRI grid using random sample points? 
> In the past I used ESRI's spatial analyst but I would like to switch all
> my analyses to R if possible.  The grid is from the National Land Cover
> Dataset  (30m res, 7 landcover classes).  I had roadside points from
> which I extracted data such as % grassland, % pine, etc in buffers of
> 90, 210, and 990 m radii.  I would like to generate 200 random samples
> from the same map to compare the roadside points to random samples (and,
> hopefully, there are no differences).   Make sense?  Hope so. 
>
> Thanks,
>
> Jeff
>
> ****************************************
> Jeffrey A. Stratford, Ph.D.
> Postdoctoral Associate
> 331 Funchess Hall
> Department of Biological Sciences
> Auburn University
> Auburn, AL 36849
> 334-329-9198
> FAX 334-844-9234
> http://www.auburn.edu/~stratja
>
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