[R] problem in Krig function of "Fields" package

[orkun]

hello

I try to build DEM  using Krig function of fields package.
And I get this error message.
here is the procedure I followed:

 > dt<-read.table("/usr/local/bartin/stat/topostat1",header=F,sep="|")
 > names(dt) <-c("x","y","z")
 > coord<-cbind(dt$x,dt$y)
 > elevation<-cbind(dt$z)
 > fit1<-Krig(coord,elevation,cov.function=exp.cov,scale.type="range")
[1] "condition number is 907405545.878743"
Error in Krig(kord, el, cov.function = exp.cov, scale.type = "range") :
        Covariance matrix is close
to
singular

here is the structure  of my data:

`data.frame':   3911 obs. of  3 variables:
 $ x: num  50139 50169 50214 50223 50227 ...
 $ y: num  4592999 4593322 4593054 4593151 4593246 ...
 $ z: int  320 320 320 320 320 320 320 320 320 320 ...

what do you suggest to solve the problem ?

kind regards



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