A function to show the grid that will be used for a given cellwidth
showGrid(dat, cellwidth, ext = 2, boundingbox = NULL)any spatial data object whose bounding box can be computed using the function bbox.
an initial suggested cellwidth
the extension parameter for the FFT transform, set to 2 by default
optional bounding box over which to construct computational grid, supplied as an object on which the function 'bbox' returns the bounding box
a plot showing the grid and the data. Ideally the data should only just fit inside the grid.