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A development of stem analysis program and its comparison with other method for increment calculation.

A development of stem analysis program and its comparison with other method for increment calculation.
Woo Hyuk Byun², Woo Kyun Lee² and Kwang Bae Yun³'
 
Abstract: In this study the stem analysis program, which can be operated with personal computer was developed
to reduce time and cost of calculation, and to increase accuracy of analysis. The stem analysis method
used in this program was compared with other methods. The results obtained were as follows : The value, 1/lOOmm measured from the latest annual ring measurement machine (Jahrringme,Bgeraete Johan Type II) was automatically inputed to the computer and saved into given file name. Turbo Pascal program was written to do this.
The measured data was analyzed by stem analysis calculation program written by Fortran-77. Volume and height increments were approximated by spline function, and diameter of the stem disk was calculated by quadratic mean method. The increment values calculated by the programs were printed annually and in every five~ year. Stem analysis diagram and several increment graphs were also easily printed. The result compared between those analysis methods showed that quadratic mean could reduce the error caused from eccentric pith. When the stem taper curve method, approximated by spline function, was used in the calculation of tree height and volume, increments would be more exactly calculated.
Key words : stem analysis : interval approximation : stem taper curve : interpolatory function : spline
function : quadratic mean
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