19 results about "Diameter at breast height" patented technology

Diameter at breast height, or DBH, is a standard method of expressing the diameter of the trunk or bole of a standing tree. DBH is one of the most common dendrometric measurements. Tree trunks are measured at the height of an adult's breast. However, this is defined differently in different countries and situations. In many countries the diameter has been measured usually at 1.3 metres above ground. In some countries, such as Australia, New Zealand, the United States, Burma, India, Malaysia, and South Africa, breast height diameter has historically been measured at a height of 1.4 metres at some times, but because of much active research into allometrics that are being applied to trees and forests, the convention of 1.3 m is now more appropriate. Previously 4.5 ft (1.37 m) was used. The height can make a substantial difference to the measured diameter. Ornamental trees are usually measured at 1.5 metres above ground.