---

Sampling circles

The four corner points of a tract are also the centre points of sample circles of equal radiuses, whilst the area covered by a sampling circle is known as a sampling plot. In order to increase the efficiency of field work, additional concentric circles (segments) have been delineated in each sampling plot with the latter associated with different diameter limits to determine whether or not a sample tree is to be included in a sample. This way, work can be performed efficiently without reducing the statistical reliability of recorded parameters. The following figure and table illustrate the configuration.