On Wed, 5 Jul 2006 [EMAIL PROTECTED] 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" > <[EMAIL PROTECTED] To > u.nl> zhijie zhang <[EMAIL PROTECTED]> > Sent by: cc > r-sig-geo-bounce r-sig-geo@stat.math.ethz.ch > [EMAIL PROTECTED] 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 > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > -- 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: [EMAIL PROTECTED] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo