Height Estimation in Stem Analysis Using Second Differences
Issa, a new method for estimating heights at different ages from crosscut ring count, is discussed in this paper. Heights corresponding to the location of nodal diaphragms for 27 black pine trees were used as control values to test the precision of the Issa method in comparison with Lenhart's (1972) and Carmean's (1972) methods and with branch whorl method. The algorithms were applied at three different crosscut sampling frequencies (50-100-200 cm). The precision of the methods was tested both in height growth and in annual height increment estimation and the predicted values were analyzed for each sampling frequency. The Issa method was the most precise at a frequency of 50 cm, and the Carmean method was the most precise at a frequency of 200 cm. Lenhart's algorithm produced the least satisfactory estimations independently of crosscut sampling frequency. For. Sci. 40(2):329-340.
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