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- Title
偏冠对树冠垂直投影面积计算的影响.
- Authors
孙 钊; 潘 磊; 乔晶晶; 丁志丹; 孙玉军; 王轶夫
- Abstract
[Objective] Aiming at solve the problems of complex structure and irregular shape of tree crown to realize the automatic calculation of vertical projection area of tree crown and improve the calculation accuracy of projection area of tree crown. [Method] A total of 453 Cunninghamia lanceolata trees were selected in the study area, and the crown width of each tree in 8 directions were accurately measured. Visual studio and ArcGIS mixed programming were used to convert the coordinates of the measured canopy radius. And the Bezier curve was used to smooth the boundary, so as to realize the automatic extraction of the vertical projection area of the tree crown, and the results were compared with that of the traditional calculation method. The "roundness" were used to evaluate the crown partial crown, and the correlation between the partial crown index and the vertical crown projection area were calculated. [Result] The method proposed in this paper can calculate the real canopy vertical projection area. The result indicates that the more the measurements of crown radius during calculating the canopy vertical projection area, the closer the calculation result to the real crown area. Compared with the ellipse method, the area obtained by treating the crown as a circle is closer to the real area. It is also found that, there is a significant positive correlation between the results of calculating the crown vertical projection area with different methods and the difference of the crown vertical projection area and the crown deviation index. [Conclusion] The area calculation method based on the shape of the canopy projection area is more accurate than the traditional area calculation method, which provides a alternative idea for the verification of forestry remote sensing crown extraction accuracy.
- Subjects
CROWNS (Botany); CHINA fir; REMOTE sensing; PROBLEM solving; FORESTS &; forestry; CURVES
- Publication
Forest Research, 2022, Vol 35, Issue 1, p166
- ISSN
1001-1498
- Publication type
Article
- DOI
10.13275/j.cnki.lykxyj.2022.01.019