One model stand consisting of several patches
patches
list of patches in one stand
area
the area of each patch
year
the year of the current patch vegetation
hexagon
a TriangBody-class
Hexagon definition used for all patches
layout
either 'linear' or 'square'
composition
either 'spatial' or 'temporal'. Has no effect yet.
patch.pos
the position of the patche hexagon centers