sar: Surface Area Ratio

Description Usage Arguments Value Note Author(s) References Examples

View source: R/sar.R

Description

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

Usage

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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)) )

Author(s)

Jeffrey S. Evans <[email protected]>

References

Berry, J.K. (2002). Use surface area for realistic calculations. Geoworld 15(9):20-1.

Examples

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  library(raster)
  data(elev)
  surface.ratio <- sar(elev, s=90)
  plot(surface.ratio)
    

jeffreyevans/spatialEco documentation built on Oct. 13, 2018, 6:53 p.m.