[R] question about krige code in R

From: Alessandro <alessandro.montaghi_at_unifi.it>
Date: Wed, 30 Jul 2008 15:43:21 -0700

Hi All,  

I have this question. I wish to create a kriging map with R but I haven't a auxiliary map. I have only one txt file with X, Y and Z records.

When I use this code:    

plot(variogram(Z~sqrt(X+Y), subground, cutoff=1800, width=10))

subground.or <- variogram(Z~sqrt(X+Y), subground, cutoff=1800, width=10)

subground.ovgm <- fit.variogram(subground.or, vgm(1, "Gau", 1000, 1))

subground.ok <- krige (Z~sqrt(X+Y), subground, subground.ovgm, nmax=40) *  

*[the original code is elevations.ok = krige(Z~1, elevations, dem, elevations.ovgm, nmax=80) ]  

when I use this one there is this message (with my data setting), because I have only txt file and I haven't a DEM ascii file:  

"Error in proj4string(newdata) : proj4string only works for class(es extending) Spatial."  

Is it possible use only one file with krige?  

Thank you  


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