You say that data.grid can be any spatial object for which I would like predictions. How could I create it? I have successfully done sp1 = SpatialPointsDataFrame(coordinates(sp0), data = sp0@data), but when I tried gridded(sp1) = TRUE, an error came; "suggested tolerance minimum: 0.0764967. Error in points2grid(points, tolerance, round) : dimension 1 : coordinate intervals are not constant" And when I tried fullgrid(sp1) <- TRUE, another error came ; "Error in function (classes, fdef, mtable) : unable to find an inherited method for function "fullgrid<-", for signature "SpatialPointsDataFrame", "logical""
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