gridded = TRUE/FALSE). The size of the grid should be also defined by the user.
"Grid.def"(object,gridded,numberOfCellsX,numberOfCellsY)Points.TRUE/FALSE. If true, then Spatial grid is made.SpatialPixels or data.frame, depends on whether
the spatial grid is required.
Points-class, Grid.box, Grid.interpolation, uncertaintyInterpolation2-package