Tree expansion factorn. The number of trees per unit area represented by a record in a tree list.
The tree expansion factor for sampled trees depends on the inventory design used. For fixedarea plot sampling, the tree expansion factor is the inverse of the plot size. For example, if a tree is measured on a 1/10th acre plot, the tree expansion factor would be 10 trees per acre. When point sampling is conducted using a prism, the tree expansion factor can be determined from the basal area factor of the prism and the diameter at breast height (DBH) of the tree (Avery and Burkhardt 1994).
