Study on Automatic Extraction of Fast-Growing Eucalyptus Stand Parameters Based on UAV Remote Sensing Images

doi:10.13466/j.cnki.lyzygl.2021.03.018

Abstract

Abstract:

With the support of real-world 3D modeling software,the UAV remote sensing technology was used to obtain images of fast-growing eucalyptus areas in Fusui County,Guangxi.The aerial photography data was processed automatically with Pix4d software,so as to obtain the Digital Orthophoto Map l(DOM),Digital Surface Model (DSM) and crown height model.Then the fast-growing eucalyptus forest tree stem,tree height,canopy density and other forest parameters were extracted based on the crown height model,and the precision of the extracted parameters was analyzed.The results showed that the stem precision verification index (stem detection rate,accuracy rate and f parameter) was better,and there was a strong correlation between the estimated value of tree height and the measured value of tree overestimation,and the accuracy of canopy density was 92.85%.The automatic extraction method of fast growing Eucalyptus stand parameters based on UAV remote sensing image could meet the relevant practical requirements,it could replace the manual measurement to a certain extent,and it would have broad application prospect in plantation.

Key words: UAV, remote sensing image, fast growing eucalyptus forest, forest parameters, automatic extraction

CLC Number:

S771.8
TP75

QIU Shiping, WEI Mingxin, MA Yisha. Study on Automatic Extraction of Fast-Growing Eucalyptus Stand Parameters Based on UAV Remote Sensing Images[J]. FOREST RESOURCES WANAGEMENT, 2021, (3): 114-119.

Figures/Tables 8

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窗口值	视觉效果/(°)	纹理紧密程度/%
1×1	29.56	0.00
3×3	29.54	1.95
5×5	29.51	2.75
7×7	29.49	3.20
8×8	29.47	3.65
9×9	29.46	3.85
10×10	29.43	3.87
11×11	29.42	3.97

株数提取方法	株数探测率	株数准确率	F参数
自动化法	0.9788	0.9167	0.9467
实测法	1	1	1

速生桉径级	实测平均树高	自动提取树高
5(5.0~5.4cm)	9.6	10.06
6(5.5~6.4cm)	10.3	11.38
7(6.5~7.4cm)	11.7	11.05
8(7.5~8.4cm)	13.7	14.18
9(8.5~9.4cm)	14.1	13.42
10(9.5~10.4cm)	16.1	15.87
11(10.5~11.4cm)	16.3	16.46
12(11.5~12.4cm)	16.3	16.15
13(12.5~13.4cm)	16.9	16.58
14(13.5~14.4cm)	17.1	17.33

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