[R-sig-Geo] Data grid in kriging?

[riaarinda]

Currently I am trying to do kriging function in R. When I see the demo(krige)
in R, there are 2 data used. *.shp and *.grid. Can I use kriging when I only
have shape file (*.shp)? What is data.grid actually and can I create the
grid from shp file I have?
Thank you

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