[R-sig-Geo] how do we sample in spatial statistics?

[Roger Bivand]

On Wed, 5 Jul 2006 Olsen.Tony at epamail.epa.gov wrote:

> We have developed a spatial sampling library, spsurvey,  that we are
> about to submit to cran.  It can sample points, lines, or polygons using
> either simple random sampling, unequal probability sampling,
> stratification.  Main focus is on spatially balanced sampling - new
> approach developed by Stevens and Olsen.  spsurvey currently uses ESRI
> shapefiles as main input but when it reads them in it creates an sp
> object.  The resulting sample is also an sp object.  A prelliminary
> version of the library can be found at http://www.epa.gov/nheerl/arm
> under "Software Downloads".  It is called psurvey.design there.
> spsurvey should be on cran before end of July.

Thanks for this information, it is very good news. May I copy this 
information to the Rgeo website, or would you prefer to wait until the 
package reaches CRAN?

Roger

> 
> Tony Olsen
> 
>                                                                         
>              "Edzer J.                                                  
>              Pebesma"                                                   
>              <e.pebesma at geo.u                                        To 
>              u.nl>                    zhijie zhang <epistat at gmail.com>  
>              Sent by:                                                cc 
>              r-sig-geo-bounce         r-sig-geo at stat.math.ethz.ch       
>              s at stat.math.ethz                                   Subject 
>              .ch                      Re: [R-sig-Geo] how do we sample  
>                                       in spatial statistics?            
>                                                                         
>              07/04/2006 01:19                                           
>              AM                                                         
>                                                                         
>                                                                         
>                                                                         
> 
> 
> 
> 
> zhijie zhang wrote:
> > Dear friends,
> >   Sorry for sending an empty email because of mismanipulation.
> >   Do we also use sample() function to do the spatial sampling? I look
> for
> > the sample() and think it's one-dimensional sampling.
> > In spatial statistics, do we need two-dimentional sampling or some
> other
> > sampling techniques? Which functions could be used in spatial samping
> in R?
> > thanks very much!
> >
> >
> spsample in package has a few simple spatial sampling techniques
> (basically those described in Ripley, 1981: random, regular,
> stratified, nonaligned systematic) on lines, polygons and
> grids. More advanced sampling techniques are found in
> package spatstat.
> 
> --
> Edzer
> 
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no