Extraction of forest structural parameters based on the intensity information of high-density airborne light detection and ranging

被引：13
作者：
Cao, Chunxiang [1 ]
Bao, Yunfei [1 ,2 ]
Chen, Wei [1 ,2 ]
Dang, Yongfeng [3 ]
Li, Lin [4 ]
Tian, Rong [1 ,2 ]
Li, Guanghe [5 ]
机构：
[1] Chinese Acad Sci, Inst Remote Sensing Applicat, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China
[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
[3] State Forestry Adm, Beijing 100714, Peoples R China
[4] China Agr Univ, Coll Informat & Elect Engn Comp Sci & Technol, Beijing 100083, Peoples R China
[5] Beijing Univ Technol, Beijing 100124, Peoples R China
来源：
JOURNAL OF APPLIED REMOTE SENSING | 2012年 / 6卷
关键词：
airborne light detection and ranging; intensity information; forest structural parameters; CHM; local maximum filter; BASAL AREA; LIDAR DATA; HEIGHT; LASER;
D O I：
10.1117/1.JRS.6.063533
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The quantitative description of forest canopy structure is significant for the investigation of a forest, which serves as an important component of the terrestrial ecosystem. Light detection and ranging (LIDAR), as a new technical means that can acquire high-precision vertical information, plays a crucial role in forest monitoring and management. Choosing Dayekou forest experimental area in the Heihe watershed as a study area, we separated the ground points from the vegetation points using the skewness-change algorithm based on the intensity information from airborne LIDAR data. After that, digital terrain model (DTM) and digital surface model (DSM) were generated, respectively, based on which the canopy height model (CHM) was acquired. Finally, using the variational window, the local maximum filter method was used to extract individual tree heights and crown widths from CHM. The determination coefficients of tree heights and crown widths were 0.8568 and 0.3923, respectively. The validation results indicated that the tree heights could be effectively extracted from intensity information of airborne LIDAR, while the accuracy of extracted crown widths needed to be improved. In the future work, aerial photos and other high-resolution images would be combined to improve the accuracy. (c) 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.JRS.6.063533]
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页数：12
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