The Doyle Log Scale estimates volume primarily from which two measurements?

The Doyle Log Scale estimates volume primarily from which two measurements?

• A. Height and length
• B. Diameter and moisture
• C. DBH and height
• D. DBH and age

Answer: (C)

Doyle's log scale estimates volume from the log’s size and shape in a simple, field-friendly way. The two measurements it relies on are the diameter of the log at its small end and the log’s length. Volume for a log is essentially cross-sectional area times length, and the Doyle rule turns measurements of that end diameter and length into a board-foot estimate through a practical conversion table. The diameter at breast height (DBH) or the tree’s overall height aren’t used in this rule because it’s designed to estimate the yield of a harvested log, not the standing tree’s dimensions. Moisture or age don’t enter the basic volume calculation either; they affect value or quality, not the fundamental log-volume estimate.

Doyle's log scale estimates volume from the log’s size and shape in a simple, field-friendly way. The two measurements it relies on are the diameter of the log at its small end and the log’s length. Volume for a log is essentially cross-sectional area times length, and the Doyle rule turns measurements of that end diameter and length into a board-foot estimate through a practical conversion table. The diameter at breast height (DBH) or the tree’s overall height aren’t used in this rule because it’s designed to estimate the yield of a harvested log, not the standing tree’s dimensions. Moisture or age don’t enter the basic volume calculation either; they affect value or quality, not the fundamental log-volume estimate.