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„Optimal“ distribution of measurement points along a stem to determine stem volume with highest precision by interpolation with cubic splines. Three measurement points are “fixed”: at 0.2 m height (assumed felling height), at 1.3 m (dbh) and total height (where radius is 0). The optimal combination of relative heights in which these additional measurements should be taken is given for 1, 2, and 3 additional measurements. Basis for these studies were data sets from Eucalyptus plantations in Brazil.

Reference:

Kleinn C. 1989: Überlegungen zur Berechnung von Einzelbaumvolumen mittels kubischer Spline Interpolation (in German: On the calculation of single tree volumes by cubic spline interpolation). AFZ 47:1246-1247.