集成高分辨率UAV影像与激光雷达点云的亚热带森林林分特征反演

许子乾, 曹林, 阮宏华, 李卫正, 蒋圣

Inversion of subtropical forest stand characteristics by integrating very high resolution imagery acquired from UAV and LiDAR point-cloud

XU Zi-Qian,CAO Lin,RUAN Hong-Hua,LI Wei-Zheng,JIANG Sheng

表4 联合提取估算模型及精度评价

Table 4 The integrated models and their accuracy assessments

林分特征变量 Stand characteristics 联合提取估算模型 Combined extraction estimation models R2 RMSE rRMSE (%) Lorey’s树高 Lorey’s height (H)(m) H = 0.23 + 0.579havg + 0.346h90 0.86 0.13 6.47 林分密度 Stand density (N)(plant·hm-2) N = 596.552 + 414.135h60 - 346.586h30 0.29 0.69 27.04 胸高断面积 Basal area (G)(m2·hm-2) lnG = 2.752lnh60 - 1.841lnh10 - 1.126 0.53 0.28 16.38 蓄积量 Volume (V)(m3·hm-2) lnV = 2.499 + 1.429lnh90 + 0.7lnd90 0.59 0.40 6.93