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吉亚德(Girard)形率是树干第一段16呎 长原木的小头去皮直径(在立木17.3呎高度处)与带皮胸径之比乘100。美国的许多材积表已广泛使用这种形率。(美国有三种材积表:地方材积表,标准材积表和形率级材积表。后一种材积表是用标准形率(q_2)或吉亚德形率(q_G)编制的——译注)因为测定吉亚德形率也比较麻烦,编表时多通用78的形率。
The Girard form factor is the ratio of the peeled diameter of the head of a 16-foot-long log (at a height of 17.3 feet) to the belt-thigh diameter multiplied by 100 for the first trunk of a tree trunk. Many form tables in the United States have widely used this form factor. (There are three types of volume tables in the United States: local volumetric tables, standard volumetric tables, and pro-rated volumetric tables. The latter volume scale is produced using either the standard rate (q_2) or the rate of qiag (q_G) Determination of Kyrgyz form rate is also more trouble, more versatile form 78 index.