Thanks, I'll tried with the latter approach!! E. --------------------------------------- Enrico R. Crema PhD Candidate Institute of Archaeology, UCL AHRC Centre for the Evolution of Cultural Diversity, UCL http://www.cecd.ucl.ac.uk/people/?go1=91 +44 7899093191 [email protected] [email protected]
On 9 Oct 2009, at 10:40, Edzer Pebesma wrote: > If the variables are spatially uncorrelated, it is a special case of > what I provided, and you could specify the variography in terms of > pure > nuggets, and/or use a neighbourhood of 1 (or 0?). > > As an alternative, fill the grids with data generated with function > rmvnorm in package mvtnorm. > > I find it however hard to understand what you mean by a spatial > cross-correlation index, especially the word spatial, when you do not > want to address spatial autocorrelation of the variables themselves. > -- > Edzer > > Enrico R. Crema wrote: >> Many Thanks, >> But I guess explained very badly (sorry for this!!) what I need. I am >> building an Agent Based Simulation and part of the model requires >> series of two randomly generated raster maps, having a spatial >> cross-correlation index ranging from -1 to +1. Clearly If I can >> specify autocorrelation of each that will be even better, but at this >> stage I just need two randomly generated surfaces with a >> user-specified Cross-Correlation Index. Sorry again for the bad >> explanation! >> >> Enrico >> >> --------------------------------------- >> Enrico R. Crema >> PhD Candidate >> Institute of Archaeology, UCL >> AHRC Centre for the Evolution of Cultural Diversity, UCL >> http://www.cecd.ucl.ac.uk/people/?go1=91 >> +44 7899093191 >> [email protected] >> [email protected] >> >> >> >> >> >> >> >> On 9 Oct 2009, at 07:49, Edzer Pebesma wrote: >> >>> Enrico, try >>> >>> library(gstat) >>> demo(cosimulation) >>> >>> First part is on Gaussian simulation, the second on indicator >>> simulations. >>> >>> Best regards, >>> >>> Enrico R. Crema wrote: >>>> Dear All, >>>> Is there any R function capable a set of two raster maps with a >>>> user- >>>> defined spatial cross-correlation index (between the two rasters)? >>>> Many Thanks, >>>> Enrico Crema >>>> --------------------------------------- >>>> Enrico R. Crema >>>> PhD Candidate >>>> Institute of Archaeology, UCL >>>> AHRC Centre for the Evolution of Cultural Diversity, UCL >>>> http://www.cecd.ucl.ac.uk/people/?go1=91 >>>> +44 7899093191 >>>> [email protected] >>>> [email protected] >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> [[alternative HTML version deleted]] >>>> >>>> _______________________________________________ >>>> R-sig-Geo mailing list >>>> [email protected] >>>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo >>>> >>> >>> -- >>> Edzer Pebesma >>> Institute for Geoinformatics (ifgi), University of Münster >>> Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251 >>> 8333081, Fax: +49 251 8339763 http://ifgi.uni-muenster.de/ >>> http://www.springer.com/978-0-387-78170-9 [email protected] >>> >> >> > > -- > Edzer Pebesma > Institute for Geoinformatics (ifgi), University of Münster > Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251 > 8333081, Fax: +49 251 8339763 http://ifgi.uni-muenster.de/ > http://www.springer.com/978-0-387-78170-9 [email protected] > [[alternative HTML version deleted]]
_______________________________________________ R-sig-Geo mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-geo
