Export kde object as shapefile

I am trying to estimate home range size using the plug-in method with
kernel density estimation in the kernel smoothing (ks) package.  Unless
there is another way I am not familiar with, in order to calculate spatial
area under the space I need to convert my kde () object into a spatial
object somehow in order to calculate its spatial area.  Could someone
demonstrate how this might be done?

Here is a plausible solution from the R-sig-geo forum....

Here's one way:

    library(ks)

    data(unicef)
    H.scv <- Hscv(x=unicef)
    fhat <- kde(x=unicef, H=H.scv)
    image(fhat$eval.points[[1]], fhat$eval.points[[2]], fhat$estimate)

    library(sp)

    spkde <- image2Grid(list(x = fhat$eval.points[[1]], y =
    fhat$eval.points[[2]], z = fhat$estimate))
    contour(spkde, add = TRUE)

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