Retrieving crop fractional cover and LAI based on airborne Lidar data  

作　　者：CUIYaokui ZHAOKaiguang FANWenjie XUXiru 

机构地区：[1]InstituteofRSandGIS,Pekinguniversity,Beijing100871,China； [2]CenterOnGlobalChange,DukeUniversity,Durham,NC27708,USA

出　　处：《遥感学报》2011年第6期1276-1288,共13页NATIONAL REMOTE SENSING BULLETIN

基　　金：国家自然科学基金(编号:40734025;40871186);国家高技术研究发展计划(863计划)(编号:2009AA12Z143);国家重点基础研究发展计划(973计划)(编号:2007CB714402);中国科学院西部行动计划(二期)项目"黑河流域遥感-地面观测同步试验与综合模拟平台建设"(编号:KZCX2-XB2-09)~~

摘　　要：虽然Lidar点云数据已被广泛应用于获取森林各项结构参数,但这些方法并不适合于低矮的灌丛、林地和农作物。本文以玉米为研究对象,提出利用机载Lidar点云数据的强度信息和全波形数据中的距离与扫描天顶角信息,反演农作物覆盖度和LAI的方法。在黑河进行的飞行实验和地面验证表明,该方法具有较高精度,也表明Lidar在低矮自然植被监测和农业应用上有较大潜力。Light detection and ranging （Lidar） point cloud data contains the information of the 3D coordinate and intensity, which can be applied to acquire the height of crown, fractional cover etc. in high-statue vegetation, such as the forest. Meanwhile, with the improvement of data storage capacity and processing speed, small footprint airborne Lidar is able to store the entire reflected waveform through digitally sampling, which expands the application of Lidar. However, the methods used in forest are not suitable for shrubs, crops and other low canopies. In this paper, we choose the cron as the study object, and propose a crop fractional cover and leaf area index （LAI） retrieval method using airborne Lidar intensity of ground hits and the distance and zenith angle information contained in waveforms data. Relevant fight experiment and ground measurements in Heihe indicate that the method is reliable, and the experiment also validates the great potential for Lidar to be applied to monitor low natural vegetation in agriculture.

关 键 词：遥感技术 应用 理论 图像处理 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]