sar

From spatialEco v1.3-2 by Jeffrey S Evans

Calculates the Berry (2002) Surface Area Ratio based on slope

sar(x, s = NULL, ...)

x: raster object
s: 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

SAR is calculated as: resolution^2 * cos( (degrees(slope) * (pi / 180)) )

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)
    
# }

Documentation reproduced from package spatialEco, version 1.3-2, License: GPL-3

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