Standard Error of Tree Height Using “Vertex III”

Abstract

The idea to quantify the subjectivity at height measurement came with the large applicability of modern instruments. The aim of the study was to estimate the standard error of tree height using Vertex III in optimal conditions. In this way, the error caused by the accuracy of the sightline was separated. A total of 104 users measured the height of three studied trees. Mean, confidence interval of mean, absolute and relative deviations, coefficient of variation, and mean error of one tree height measurement were computed for each tree. Results emphasize that the user error caused by the sightline at the top of the tree is about 0.2 – 0.3 m.