Hierarchical Slope Position

Calculates a hierarchical scale decomposition of topographic position index

hsp(
  x,
  min.scale = 3,
  max.scale = 27,
  inc = 4,
  win = "rectangle",
  normalize = FALSE
)

Arguments

x	Object of class raster (requires integer raster)
min.scale	Minimum scale (window size)
max.scale	Maximum scale (window size)
inc	Increment to increase scales
win	Window type, options are "rectangle" or "circle"
normalize	Normalize results to 0-1 scale (FALSE | TRUE)

Value

raster class object

Note

if win = "circle" units are distance, if win = "rectangle" units are number of cells

References

Murphy M.A., J.S. Evans, and A.S. Storfer (2010) Quantify Bufo boreas connectivity in Yellowstone National Park with landscape genetics. Ecology 91:252-261

Author

Jeffrey S. Evans <jeffrey_evans@tnc.org>

Examples

# \donttest{ 
  library(raster)
  data(elev)
  hsp27 <- hsp(elev, 3, 27, 4, normalize = TRUE)
#> Calculating scale:27
#> Calculating scale:23
#> Calculating scale:19
#> Calculating scale:15
#> Calculating scale:11
#> Calculating scale:7
#> Calculating scale:3
#> Warning: no non-missing arguments to min; returning Inf
#> Warning: no non-missing arguments to max; returning -Inf
#> Warning: no non-missing arguments to min; returning Inf
  plot(hsp27)
 # }