Fragmentation Main Model

The fragmentation model combines patch size and patch continuity with
diversity of vegetation types per patch and rarity of vegetation types per patch. A
patch was defined as an area of natural vegetation not bisected by roads, utilities,
or rails. Patch size and continuity were calculated separately for forests,
woodlands, shrublands, grasslands and riparian areas. Definitions of each system
type can be found in the data atlas
(http://allaboutwatersheds.org/groups/SAS/public/data-atlases).