given as:

* individuals - when there are a few unconnected trees of a type.
* troop - up to 5 trees connected of one type.
* group - when there are more than 5 trees, but they are shorter than a harvestable tree.
* thicket - when there are more than 5 trees, but they are taller than a harvestable tree to around 0.5 ha.
* rotten group (cluster) - a packed together standing aggregate of trees, trees in the rotten group have different heights and different depths or a stripwise arrangement. Rotten is from German, Rotte