Fig. 5

The average relative RMSE as a function of measurement times (min per plot) for different plot types for basal area (a), stems per ha (b) and volume (c) with the two subsample tree selection strategies (S1 = fixed, S2 = relascope). In relascope plots, the vertical variation is due to varying relascope factor and the horizontal due to varying maximum radius. In fixed and concentric plots the vertical variation is due to the varying radii and the horizontal due to the diameter limit