Study of Subtropical Forestry Index Retrieval Using Terrestrial Laser Scanning and Hemispherical Photography
文献类型： 外文期刊
作者： Yun, Ting 1 ; Li, Weizheng 4 ; Sun, Yuan 5 ; Xue, Lianfeng 1 ;
作者机构： 1.Nanjing Forestry Univ, Sch Informat Sci & Technol, Nanjing 210037, Jiangsu, Peoples R China
2.Chinese Acad Trop Agr Sci, Rubber Res Inst, Danzhou 571737, Peoples R China
3.Nanjing Forestry Univ, Joint Ctr Sustainable Forestry Studies Southern C, Nanjing 210037, Jiangsu, Peoples R China
4.Nanjing Forestry Univ, Adv Anal & Testing Ctr, Nanjing 210037, Jiangsu, Peoples R China
5.Nanjing Forestry Univ, Coll Forestry, Nanjing 210037, Jiangsu, Peoples R China
期刊名称：MATHEMATICAL PROBLEMS IN ENGINEERING （ 影响因子：1.305； 五年影响因子：1.27 ）
ISSN： 1024-123X
年卷期： 2015 年
页码：
收录情况： SCI
摘要： In order to retrieve gap fraction, leaf inclination angle, and leaf area index (LAI) of subtropical forestry canopy, here we acquired forestry detailed information by means of hemispherical photography, terrestrial laser scanning, and LAI-2200 plant canopy analyzer. Meanwhile, we presented a series of image processing and computer graphics algorithms that include image and point cloud data (PCD) segmentation methods for branch and leaf classification and PCD features, such as normal vector, tangent plane extraction, and hemispherical projection method for PCD coordinate transformation. In addition, various forestry mathematical models were proposed to deduce forestry canopy indexes based on the radiation transfer model of Beer-Lambert law. Through the comparison of the experimental results on many plot samples, the terrestrial laser scanner- (TLS-) based index estimation method obtains results similar to digital hemispherical photograph (HP) and LAI-2200 plant canopy analyzer taken of the same stands and used for validation. It indicates that the TLS-based algorithm is able to capture the variability in LAI of forest stands with a range of densities, and there is a high chance to enhance TLS as a calibration tool for other devices.
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