Fig. 5

Precision versus expected costs for different fixed radius (maximum radius between 3 and 11 m), relascope (basal area factors from 1 to 3), and concentric plots (dbh limit from 5 to 15 cm) for the estimation of change in tree density (with a certain minimum dbh of either 0.1, 2.5, 4.5, or 9.5 cm) between consecutive time measurements for each minimum dbh. The precision has been measured by the standard deviation (sd) of the respective estimator (see (4)). The expected cost is the sum of expected costs of the consecutive measurements. Both the mean sd and mean expected cost were obtained by averaging over the forest plots. This is a zoomed view and some values have been cut off