Evaluation of mensuration equipment for upper-stem height and diameter measurements.

Abstract

To assess standing timber volume and value, inventory and analysis methods are needed that can capture the precise stem form of individual trees. Most taper or tree form models perform much better if upper-stem diameter measurements are available, in addition to DBH and height values. This paper reports on the testing of hand-held tools for upper stem diameter and height measurements. The evaluation of the equipment was based on the accuracy of diameter and height measurements, the time required to carry out these measurements and the cost of the equipment. The test involved familiarisation with the equipment, followed by diameter and height measurements on four Norway spruce trees at 1⁄3 and 3⁄5 of total tree height. Both experienced and inexperienced professional foresters were included in the study.