from:
http://www.treeboss.net/trees_have_value.htm
http://butlerlandscapes.com/landscape-design-installation/how-to-determine-trunk-size/
Small trees
Smaller nursery-sized trees that are readily transplanted are usually measured by their "trunk caliper" (diameter) anywhere from 6 to 12 inches above the soil surface, depending on their caliper size. Example: a 2 to 2-1/2 inch caliper tree is measured 6 inches above the ground.
Smaller nursery-sized trees that are readily transplanted are usually measured by their "trunk caliper" (diameter) anywhere from 6 to 12 inches above the soil surface, depending on their caliper size. Example: a 2 to 2-1/2 inch caliper tree is measured 6 inches above the ground.
Diameter is the relationship between the circumference of the a circle (in this case the trunk) and the number π (3.14).
It can be expressed as: Diameter = Circumference ÷ π
Example:
- The circumference of the tree is measured at 46.5 inches,
- Diameter = 46.5 ÷ 3.14
- Diameter = 14.8
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