The possibility of using the trees survey carried out by UAV DJI Phantom 4 to determine their horizontal projections has been shown. This approach is established to allow improving the quality, accuracy and speed of determining the area of the crown horizontal projection by means of the actual cartographic material processed in the GIS-environment. The proposed method was tested in forests and landscape gardens located in Berezhany in Ternopil Region by comparing the results obtained using both this approach and a traditional measurement procedure. It was revealed that the proposed method allows obtaining high accuracy results due to a better transfer of the crown configuration from the UAV photographic materials as compared to traditional measuring methods which provide information about its radii only. This approach allows us to determine the horizontal projections of tree crowns using software minimizing at that labor-intensive field work and creating conditions for storing information in digital format. It can be used for the needs of forest and parks managements, to study interaction of woody plants in stands, to determine stand canopy density and to conduct an inventory of greenery or other studies.
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