Stand parameter extraction based on video point cloud data  

作　　者：Ziyu Zhao Zhongke Feng Jincheng Liu Yudong Li 

机构地区：[1]Precision Forestry Key Laboratory of Beijing,Beijing Forestry University,Beijing 100083,People’s Republic of China [2]College of Natural Resources and Environment,Northwest A&F University,Xian 712100,People’s Republic of China

出　　处：《Journal of Forestry Research》2021年第4期1553-1565,共13页林业研究（英文版）

基　　金：funded partly by the National Natural Science Foundation of China (Grant number funded this research U1710123);the Fundamental Research Funds for the Central Universities (No.2015ZCQ-LX-01)。

摘　　要：Monitoring sample plots is important for the sustainable management of forest ecosystems.Acquiring resource data in the field is labor-intensive,time-consuming and expensive.With the rapid development of hardware technology and photogrammetry,forest researchers have turned two-dimensional images into three-dimensional point clouds to obtain resource information.This paper presents a method of sample plot analysis using two charge-coupled device(CCD) cameras based on video photography.A handheld CCD camera was used to shoot the sample plot by surrounding a central tree.Video-based point clouds were used to detect and model individual tree trunks in the sample plots and the DBH of each was estimated.The experimental results were compared with field measurement data.The results show that the relative root mean squared error(rRMSE) of the DBH estimates of individual trees was 2.1-5.7%,acceptable for practical applications in traditional forest inventories.The rRMSE of height estimates was2.7-36.3%.Average DBH and heights,and tree density and volume were calculated.Video-based methods require compact observation instruments,involve low costs during field investigations,acquire data with high efficiency,and point cloud data can be processed automatically.Furthermore,this method can directly extract information on the relative position of trees,which is important to show distribution visually and provides a basis for researchers to regulate stand density.Additionally,video photography with its unique advantages is a technology warranting future attention for forest inventories and ecological construction.

关 键 词：Video photography Point cloud FOREST Hough transform DBH 

分 类 号：S758.5[农业科学—森林经理学] S712[农业科学—林学]