In case of the eucalyptus plantations only the tree height of each tree is available which is not enough information to get to a good estimation of the dbh. Therefore a formula (2) was provided by the forest management, Alianca Florestal, which defines a relation between the individual trees and stand wise information. A stand wise information can be the size of the stand, the tree species, age class and dominant tree height to estimate the timber volume of a stand. For eucalyptus the dominant height was defined as the average height of 20 % of the dominant trees.