Landscape Division Index

Is calculated as 1 minus the sum of individual patch area divided by total landscape area, summed across all patches of the corresponding landcover class type. Returns the probablity that two random landscape cells are not in the same landcover class patch.
For furthere information about the indices see: Jaeger, Jochen AG. "Landscape division, splitting index, and effective mesh size: new measures of landscape fragmentation." Landscape ecology 15.2 (2000): 115-130.