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If you're interested in using GRASS for this, here are the steps. To smooth the original, r.neighbors creates a new raster where each pixel gets the average value of surrounding pixels within a window. THen you can use r.recode to get a new raster with discrete categorical values replacing the continous population density. And finally, r.to.vect will convert ...


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Note where the error is coming from and step through your code. Its not even getting to the Savitsky-Golay line. > v = as.vector(r) > z = na.spline(v) > s1.ts2 = ts(z, start=1, end=nlayers(z), frequency=12) Error in (function (classes, fdef, mtable) : unable to find an inherited method for function ‘nlayers’ for signature ‘"numeric"’ The error ...


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