Definition: Tree diameter at breast height. This has traditionally been the "sweet spot" on a tree where measurements are taken and a multitude of calculations are made to determine things like growth, volume, yield and forest potential.
Tree d.b.h. is outside bark diameter at breast height. Breast height is defined as 4.5 feet (1.37m) above the forest floor on the uphill side of the tree. For the purposes of determining breast height, the forest floor includes the duff layer that may be present, but does not include unincorporated woody debris that may rise above the ground line.
Also Known As: DBH - Diameter at Breast Height
DBH is the most frequent measurement made by a forester
using either a diameter tape or tree caliper.