Double Entry Volumetric Models for Use in Brazilian Forest Stands

ABSTRACT This study aimed to present some double entry volumetric models developed to quantify the volume of wood in Brazil. As a case study, we used data of 180 trees-sample of Eucalyptus urophylla and Eucalyptus grandis aged 5-7 years. To evaluate the volumetric models performance, we used the following statistical criteria, standard error of the estimate, adjusted coefficient of determination, mean absolute error, sum of squared of relative errors, average of percentage error, standard deviation of the errors, determination coefficient between actual and predicted volume, square root of the average error and analysis of the distribution of residuals. We selected a volumetric model developed from the form factor equation adapted to the Gompertz’s biomathematical model.