DissectionIndex: perimeter over the circumference of the circle of
equal area. ForestFragmentation: Riitters et al. (2000) moving-window
Pf, Pff and fragmentation classes (character matrix, NA for non-forest).
Identical to the Python arm morie.fn.landfrag.
Usage
DissectionIndex(area, perimeter)
ForestFragmentation(grid, window = 3)
Arguments
- area, perimeter
Patch area and perimeter.
- grid
Binary forest matrix (1 forest, 0 other, NA missing).
- window
Odd window size.
Value
A number, vector or list.
References
Patton, D. R. (1975). A diversity index for quantifying habitat
edge. Wildlife Society Bulletin 3, 171-173.
Riitters, K., Wickham, J., O'Neill, R., Jones, B. and Smith, E. (2000).
Global-scale patterns of forest fragmentation. Conservation Ecology 4, 3.
Examples
DissectionIndex(100, 40)
#> [1] 1.128379
ForestFragmentation(rbind(c(1, 1, 1), c(1, 1, 1), c(1, 1, 0)))$classes
#> [,1] [,2] [,3]
#> [1,] "interior" "interior" "interior"
#> [2,] "interior" "perforated" "perforated"
#> [3,] "interior" "perforated" NA
