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Calculates the Berry (2002) Surface Area Ratio based on slope
sar(x, s = NULL, ...)
raster object
cell resolution (default is NULL, not needed if projection is in planar units)
Additional arguments passed to raster::calc
raster class object of Berry (2002) Surface Area Ratio
Berry, J.K. (2002). Use surface area for realistic calculations. Geoworld 15(9):20-1.
# NOT RUN { library(raster) data(elev) surface.ratio <- sar(elev, s=90) plot(surface.ratio) # }
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