Abstract
Analysis Tools of Uniform Angle Index is of great importance to structure-based forest management, however, few convenient tools were developed for practical use. In order to facilitate calculating Uniform Angle Index of each tree and the mean value of uniform angle index of stand in forest, a tool was developed. Firstly, the distances from four closest neighboring trees to reference tree were separately computed with the formula of the distance. Secondly, four angles between the lines passing through the reference tree and other trees and x-axis were counted with the function Atan2 ( ) and the standard angles were determined in line with subtraction of the angles (θ). Thirdly, uniform angle index of each tree and the mean value of uniform angle index of stand in forest were computed. Testing results show that the tool can precisely calculate uniform angle index. KEYWORD: Structure-based forest management; Uniform angle index; Excel VBA
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