The underestimation of the volume may result from a time gap of several months between the laser scan data acquisition and the harvesting of the stands. After a growing period of 12 years Eucalyptus reach a height of about 20m and can be harvested. This fast growing behaviour results in an increase of the timber volume within a short period of time.
In combination with the numerical output a visualization can help to compare the different stands. The Eucalyptus at all involved stands was planted at the same time but can differ in their growing behaviour