DETERMINATION OF HEIGHTS AND DIAMETERS OF TREE CROWNS FROM LIDAR DATA

UDC 630*522:630*587.5

Tolkach Igor Vladimirovich − PhD (Agriculture), Associate Professor, Assistant Professor, the Department of Forest Inventory. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: i.tolkach@belstu.by

Shulga Ekaterina Alexandrovna – master’s degree student, the Department of Forest Inventory. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: katherinashulga01@gmail.com DOI:

https://doi.org/ 10.52065/2519-402X-2024-276-2

Key words: : laser scanning, tree height, tree crown diameter, point cloud, digital elevation model.

For citation: Tolkach I. V., Shulga E. A. Determination of heights and diameters of tree crowns from lidar data. Proceedings of BSTU, issue 1, Forestry. Nature Management. Processing of Renewable Resources, 2024, no. 1 (276), pp. 15–21 (In Russian). DOI: 10.52065/2519-402X-2024-276-2.

Abstract

The development of methods of plantation taxation based on advanced technologies of aerial and space forest survey is one of the main directions of modern scientific research. The main objective of the work is to determine the heights and diameters of tree crowns based on lidar survey materials, performed by the AlphaAir 450 airborne scanner, mounted on a Matrice 300 RTK quadrocopter on a 3-axis stabilized suspension. The objects of the study were pine and fir plantations of the Central Forestry Department of the Negorelsky experimental forestry. Processing of laser scanning data was carried out in the geographic information system SAGA. As a result of the study, the methodology of laser scanning data processing for determining the heights and diameters of tree crowns was proposed; regression equations of the relationship between the indicators measured during field work and the indicators obtained from lidar survey data were constructed. As a regression equation, linear equations showed good approximation results, the coefficient of determination of which explains the variability of tree crown heights and diameters not lower than 80.16 and 87.96%, respectively. The tested methodology can be used for the purposes of forest inventory and obtaining sufficiently accurate data on hard-to-reach plantations and forests contaminated with radionuclides.

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15.10.2023