文献类型：期刊文献

英文题名：Feature analysis of LIDAR waveforms from forest canopies

作者：Liu QingWang[1] Li ZengYuan[1] Chen ErXue[1] Pang Yong[1] Li ShiMing[1] Tian Xin[1]

第一作者：刘清旺

通信作者：Li, ZY[1]

机构：[1]Chinese Acad Forestry, Res Inst Forest Resource Informat Tech, State Lab Forest Remote Sensing & Informat Tech, Beijing 100091, Peoples R China

年份：2011

卷号：54

期号：8

起止页码：1206-1214

外文期刊名：SCIENCE CHINA-EARTH SCIENCES

收录：;EI(收录号：20113214224722);Scopus(收录号：2-s2.0-79961210980);WOS:【SCI-EXPANDED(收录号:WOS:000293707400011)】；

基金：We are grateful to persons participating in data acquisition and preprocessing for the Watershed Allied Telemetry Experimental Research (WATER) program. This work was supported by the National Basic Research Program of China (Grant No. 2007CB714404), the Central Public-Interest Scientific Institution Basal Research Fund of China (Grant No. IFRIT 200803), and the National Hi-Tech Research and Development Program of China (Grant No. 2009AA12Z1461).

语种：英文

外文关键词：remote sensing; forest canopy; LIDAR; waveform feature; solid scatterer

摘要：Airborne light detection and ranging (LIDAR) can detect the three-dimensional structure of forest canopies by transmitting laser pulses and receiving returned waveforms which contain backscatter from branches and leaves at different heights. We established a solid scatterer model to explain the widened durations found in analyzing the relationship between laser pulses and forest canopies, and obtained the corresponding rule between laser pulse duration and scatterer depth. Based on returned waveform characteristics, scatterers were classified into three types: simple, solid and complex. We developed single-peak derivative and multiple-peak derivative analysis methods to retrieve waveform features and discriminate between scatterer types. Solid scatterer simulations showed that the returned waveforms were widened as scatterer depth increased, and as space between sub-scatterers increased the returned waveforms developed two peaks which subsequently developed into two separate sub-waveforms. There were slight differences between the durations of simulated and measured waveforms. LIDAR waveform data are able to describe the backscatter characteristics of forest canopies, and have potential to improve the estimation accuracy of forest parameters.