[R-sig-Geo] Efficient way to obtain gridded count of overlapping polygons?
r.hijmans at gmail.com
Thu Feb 17 17:48:00 CET 2011
> I am interested in creating a raster that summarizes the number of
> overlapping polygons that underlie each cell (in order to display how
> many species occur at that point).
You can also do the below, with raster, see ?rasterize:
r <- rasterize(pols, r, fun='count')
r <- rasterize(pols, r, fun=function(x,...)length(na.omit(x)))
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