72 Basal area mean tree
Basal area is defined as the area per hectare (usually expressed in m²) which is built by all trees standing on one hectare measured at a height of 1.3 m.
The basal area mean tree is defined by its DBH and its HEIGHT as follows:
DBH (quadratic mean diameter):
Is calculated from the arithmetric mean of the basal area of all trees (or species specific) or directly from the square root of mean quadratic diameter.
HEIGHT (height of quadratic mean diameter):
Is derived as the height from a diameter-height function coresponding to the basal area mean tree diameter.