文献类型：期刊文献

中文题名：基于机载LiDAR的四次多项式拟合法估测单木冠幅

英文题名：Estimating Individual Tree Crown Diameter Using Fourth Fegree Polynomial Fitting Method Based on Airborne LiDAR

作者：霍达[1] 邢艳秋[1] 田昕[2] 尤号田[1] 赵晨阳[1] 胡洋[1]

第一作者：霍达

机构：[1]东北林业大学森林作业与环境研究中心;[2]中国林业科学研究院资源信息研究所

年份：2015

卷号：30

期号：3

起止页码：164-169

中文期刊名：西北林学院学报

外文期刊名：Journal of Northwest Forestry University

收录：CSTPCD;;北大核心:【北大核心2014】；CSCD:【CSCD_E2015_2016】；

基金："973"国家重点基础研究发展计划项目(2013CB733400);国家自然科学基金(41171274)

语种：中文

中文关键词：小光斑激光雷达;冠幅;单木;四次多项式拟合;树高

外文关键词：small-footprint LiDAR; crown diameter; individual tree; fourth degree polynomial fitting; tree height

分类号：S758.1

摘要：小光斑激光雷达已被广泛用来估测森林参数,为了进一步提高其估测单木的精度,选取了内蒙古依根试验区野外测量的单木数据和机载LiDAR数据,提出了四次多项式拟合法。该方法首先以单木顶点为中心在CHM上提取东西、南北2个方向的高程数据。然后分别得到2组数据的四次多项式拟合曲线,曲线中两凹点之间的水平距离为该方向的冠幅值。最终将2个方向的均值作为单木冠幅估测值,冠幅估测值的平均绝对误差为0.99m。
Currently, the small-footprint LiDAR has been widely used to estimate forest parameters. In order to further improve the estimate accuracy of individual tree, field measured individual tree data and airborne LiDAR data in Eagan area of Inner Mongolia were selected, and a fourth degree polynomial fitting method was put forward. In the method, firstly, the top of individual tree was centered, elevation data on Canopy Height Model （CHM） at the north-south and the east-west directions were extracted. Secondly, two fourth degree polynomial fitting curves were extracted on the two group data, respectively. The horizontal distance between two pits on the curve was considered as crown diameter at this direction. Finally the crown diameter was calculated as the average of two values measured along two directions. The analysis showed that mean absolute error of individual crown diameter was 0.99 m.