| 光谱学与光谱分析 |
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| An Automatic Extraction Algorithm for Individual Tree Crown Projection Area and Volume Based on 3D Point Cloud Data |
| XU Wei-heng1, 2, FENG Zhong-ke1*, SU Zhi-fang3, XU Hui2, JIAO You-quan1, DENG Ou4 |
1. Institute of GIS, RS and GPS, Beijing Forestry University, Beijing 100083, China
2. Computer and Information Institute, Southwest Forestry University, Kunming 650224, China
3. Department of Mathematics, Kunming University, Kunming 650214, China
4. Institute of Public Safety Research, Department of Engineering Physics, Tsinghua University, Beijing 100084, China |
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Abstract Tree crown projection area and crown volume are the important parameters for the estimation of biomass，tridimensional green biomass and other forestry science applications. Using conventional measurements of tree crown projection area and crown volume will produce a large area of errors in the view of practical situations referring to complicated tree crown structures or different morphological characteristics. However, it is difficult to measure and validate their accuracy through conventional measurement methods. In view of practical problems which include complicated tree crown structure, different morphological characteristics, so as to implement the objective that tree crown projection and crown volume can be extracted by computer program automatically. This paper proposes an automatic untouched measurement based on terrestrial three-dimensional laser scanner named FARO Photon120 using plane scattered data point convex hull algorithm and slice segmentation and accumulation algorithm to calculate the tree crown projection area. It is exploited on VC+6.0 and Matlab7.0. The experiments are exploited on 22 common tree species of Beijing, China. The results show that the correlation coefficient of the crown projection between AV calculated by new method and conventional method A4 reaches 0.964(p<0.01); and the correlation coefficient of tree crown volume between VVC derived from new method and VC by the formula of a regular body is 0.960(p<0.001). The results also show that the average of VC is smaller than that of VVC at the rate of 8.03%, and the average of A4 is larger than that of AV at the rate of 25.5%. Assumed Av and VVC as ture values, the deviations of the new method could be attributed to irregularity of the crowns’ silhouettes. Different morphological characteristics of tree crown led to measurement error in forest simple plot survey. Based on the results, the paper proposes that: (1) the use of eight-point or sixteen-point projection with fixed angles to estimate crown projections, and (2) different regular volume formula to simulate crown volume according to the tree crown shapes. Based on the high-resolution 3D LIDAR point cloud data of individual tree, tree crown structure was reconstructed at a high rate of speed with high accuracy, and crown projection and volume of individual tree were extracted by this automatical untouched method, which can provide a reference for tree crown structure studies and be worth to popularize in the field of precision forestry.
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Received: 2013-03-20
Accepted: 2013-06-25
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Corresponding Authors:
FENG Zhong-ke
E-mail: fengzhongke@126.com
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