I. Introduction
Tree height is the vertical distance between the ground and the top of a tree. It provides useful information in the field of forest research such as quantification of timber resources, evaluation of the ecological and economic values of the forest stand, computation of the individual and number of stand volumes, understanding the regeneration rate of forests and its pattern, and it also provides habitats for animals and production to human [5] –[7]. In forest inventory, accurate information about the height of tree and diameter at breast height (DBH) are very useful. The quantification of the height and DBH of individual trees are possible to measure at field [8]. However, field measurement of the tree height is difficult to derive high accuracy because of tall, dense canopies and crowns cover [9], [10]. In addition, tree height measurement using laser range finder (forestry standard method), required times for observing the individual tree and limited for the large area [11].