Form Class

It is defined as one of the intervals in which the range of form quotients of trees is divided for classification and use. It also applies to the class of trees which fall into such an interval, which can be grouped such as 0.5-0.55. 0.55-0.6

Form Point

It is defined as the point in the crown at which wind pressure is estimated to be centered. In other words, form point ratio is defined as the relationship, usually expressed as a percentage, of the height of the form point above ground level to the total height of the tree.