POSSIBILITIES OF USING THE LASER SCANNING METHOD IN ASSESSING TREE DEFOLIATION AND OTHER DENDROMETRIC PARAMETERS

Abstract

This article analyzes the possibilities of using laser scanning (LiDAR) technology in forestry to assess tree defoliation and other dendrometric parameters. Modern forestry is trying to use as many modern technologies as possible in order to facilitate and simplify human work and eliminate the possibility of human error. Traditional methods of measuring stands provide a greater opportunity to determine the results by influencing the human factor, and also require more human labor.

The study examines the advantages and disadvantages of LiDAR when using this technology to determine tree height, crown dimensions and defoliation level, as well as their comparison with traditional methods. Experimental measurements were carried out in the forests of Ignalina district using a DJI Matrice 350 RTK drone with a Zenmuse L2 laser scanner. During the study, the results of scanning at different heights and their accuracy compared to manual measurements were evaluated.

The results show that LiDAR technology provides high measurement accuracy, the average error in tree height measurements was up to 0.5 meters, and the accuracy of defoliation assessment reached 5%, compared to 10–20% error in visual observations. However, the disadvantage of this technology is the high cost of purchasing a drone, scanner and software. Also, considering the volume of data obtained, extremely powerful computer equipment is required.

The conclusions presented in the article state that this is a very promising method for facilitating the work of a forester and making faster decisions, especially in critical situations