sar
From spatialEco v1.3-2
by Jeffrey S Evans
Surface Area Ratio
Calculates the Berry (2002) Surface Area Ratio based on slope
Usage
sar(x, s = NULL, ...)
Arguments
- x
raster object
- s
cell resolution (default is NULL, not needed if projection is in planar units)
- ...
Additional arguments passed to raster::calc
Value
raster class object of Berry (2002) Surface Area Ratio
Note
SAR is calculated as: resolution^2 * cos( (degrees(slope) * (pi / 180)) )
References
Berry, J.K. (2002). Use surface area for realistic calculations. Geoworld 15(9):20-1.
Examples
# NOT RUN {
library(raster)
data(elev)
surface.ratio <- sar(elev, s=90)
plot(surface.ratio)
# }
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