sample plots because of a lack of common reflection axes in the
first case and because of disjoint boundaries in the latter. Inspired
by edge-correction methods in forest inventory (Schmid, 1969),
Sims et al. (2009) developed a reflection method replacing missing
off-plot neighbours by trees from inside the plot (see Fig. 1).
Edge-correction methods for circular monitoring plots have
been proposed only on rare occasions and yet this plot design finds
considerable application in forest monitoring and inventory. There
is clearly a need for developing suitable compensation methods for
data gathered in circular plots and we address the question in this
paper