Approximate the gross board foot volume of a tree using the Doyle log Rule with metres for tree height and centimetres for the diameter measured @ breast height, 1.37 metres.
Board foot value results are as reported as in the Girard form class 78 table.
The merchantable tree height is from the 30 centimetres stump to a minimum top diameter which is usually a no less than 18 centimetres diameter measured inside bark.